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JHand
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Casting large vs small bullets
Aug 15th, 2026 at 9:39pm
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Before I got into schuetzen,  the only thing I really cast were pistol bullets, and 45-70 bpcr bullets. I started sorting them by weight, and ended up with a large spread, which i figured was normal. Then i got into schuetzen and cast up .32's and .28's that are much more consistent. 

Today was a "cool" California summer day (only 95 degrees!) so i fired up the 20lb Lee pot and started ladleing the lead. I cast up 100 .32's the ranged from 178.9 - 179.3, then 100 .28's that were between 152.7 - 153.2. I was plenty happy with the results,  but then moved onto 45's. I cast up 170 thet were between 531 - 533.6, which is about my normal spread on these.

Why would the spread be so much larger on the bigger bullets? I suppose i have been spoiled with my Paul Jones and John Louis molds... 

The only thought I have is that with the smaller bullets, the lead level in the pot doesn't change much, but by the time I get 80 of the 45's, the lead level is getting low, and that may affect the temp, which could affect weight?
  
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gunlaker
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Re: Casting large vs small bullets
Reply #1 - Aug 15th, 2026 at 10:13pm
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You probably have to look at it as a percentage rather than the absolute value in tenths of grains.   

I don't see a huge difference between my 45 cal black powder bullets and my 32-40 bullets.  Today I cast 100 bullets from a Mos 32 mold and over 90 of the bullets were either 199.9 or 200.0 gr.   Normally when casting my 45 cal Buffalo Arms bullets, once they come up to weight, they will be +/- 0.2 or 0.3 gr.  So you are right, more, but as a percentage maybe about the same?

Chris.
  
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gunlaker
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Re: Casting large vs small bullets
Reply #2 - Aug 15th, 2026 at 10:14pm
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Also I'm pretty impressed that you cast in 95 degree temps.  I'm from the west coast of Canada.  If it gets over 80 degrees I'm looking for some shade  Cheesy
  
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Dellet
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Re: Casting large vs small bullets
Reply #3 - Aug 15th, 2026 at 10:15pm
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I think if you look at the percentage of weight variation, they will be Pretty consistent. .5%
  
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JHand
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Re: Casting large vs small bullets
Reply #4 - Aug 15th, 2026 at 10:30pm
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gunlaker wrote on Aug 15th, 2026 at 10:14pm:
Also I'm pretty impressed that you cast in 95 degree temps.  I'm from the west coast of Canada.  If it gets over 80 degrees I'm looking for some shade  Cheesy


Gotta do what you gotta do. My stock has been running low, and i shot the last of my bpcr bullets in May, and we start again in a couple weeks. Shot the last of my schutzen bullets last month, and our match is next weekend...
  
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GT
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Re: Casting large vs small bullets
Reply #5 - Aug 16th, 2026 at 9:59am
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I agree with Chris and Todd on the percentages, bigger bullets but the percentage difference is negligible.  Not sure about you, but even when I shoot and practice everyday, that half a percent weight variation isn't measurable - too many other non-tangible variables come in to play.

What I don't get, you're doing this a week in advance??? Hot or Cold, it doesn't matter.  Rarely do I have my casting done much earlier than the night before departure or the match.   I haven't taken it to the level some I know do and take the lead pot and molds with them and cast in the motel room, for that time, I have that set aside for decapping, priming, charging and if it's fixed ammo, seating the bullet... Grin Grin
Since that earlier post about how much casing is hated, I've been going to therapy and my therapist has me practicing the power of positive thinking, "keep telling yourself how much you like shooting and to continue, you love casting".
GT
  

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TheLooseMoose
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Re: Casting large vs small bullets
Reply #6 - Aug 16th, 2026 at 4:33pm
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95 isn't too bad, kinda mild for Texas temps by comparison. I was able to visit the sweat lodge and made a bunch of 32cal and 40cal bullets a few days ago when the clouds were thick and it was only 98

As far as variance in larger calibers, I've noticed similar effects. I think there is something to be said for the volume of lead which fills the mold, ie less to go wrong with a smaller bullet since it fills the mold much faster. Small variances in your tempo and pour don't show up as much when you are pouring <200 gr of lead compared to >400 gr. I know that the volume of lead in my ladle can really change the results of my 45cal molds to completely fill out all the bands, so I try to grab as full of a ladle as possible. The smaller bullets aren't as finicky as the big pills. I try to be as consistent as possible, but I also try to cast as many as possible without overheating the mold.
Another factor could be the thermal capacity of the mold to reach and stay at what I call "thermal nirvana". Depending on what the mold is made of, I can say that my larger bullets are much more difficult to get to nirvana than the smaller bullets. How the mold responds to your tempo could play a role in the quality of the casts. Each mold is unique and what works for one doesn't always translate to another. Example, ive found that the 32 mold only needs 750 degree lead to throw great bullets, whereas my 530gr 45cal mold won't throw a decent bullet unless the lead pot is at 800 or higher. 
If you are casting different bullets at the same time, you may be experiencing the variances more than if you casted a individual batch of bullets from one mold. I used to try multiple molds at the same time, but found that to be effort wasted because the variances were too much.
Two things that really increased my production quality was switching to ladle pouring and upgrading my equipment to an RCBS digital control lead pot. Things got a lot better after those changes.

also for hot weather, I started wearing head bands to soak up the sweat a little better. Nothing more exciting than a visit from the tinsel fairies when the sweat drips on the table and splashes into the molten quicksilver  Shocked
  
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JHand
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Re: Casting large vs small bullets
Reply #7 - Aug 17th, 2026 at 12:32am
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Sweat band isn't a bad idea! It was a good 10-15 degrees cooler this weekend,  so had to take advantage.  Gonna be hot and windy for our shoots Saturday,  maybe i should sabotage the batch my wife will be shooting?
  
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marlinguy
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Re: Casting large vs small bullets
Reply #8 - Aug 17th, 2026 at 9:38am
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I always use percentage when weighing my cast bullets, so my margins are tighter for lighter bullets weight wise, but the same percentage wise.
  

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bpjack
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Re: Casting large vs small bullets
Reply #9 - Aug 17th, 2026 at 1:19pm
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My go to bullet for several of my 32-40s is the Borton/Darr 3 groove spitzer in a Hoch mould. With my bad back, I have cut my casting session shorter than it was a couple of years ago to 50-60 bullets. I have a tall swivel stool with a short back that I start with and end up standing for 5 or so bullets mid session. I like to go into match season with at least 600 match grade bullets sorted into .1 gr lots. So, I end up casting at least 2-3 mornings a week in the fall and winter. I did have to cast quite a bit this summer as I have been playing with other rifles and fixed ammo in a harder alloy for my DST 32-40 high wall. In this neck of the woods it is fairly cool in the morning even if it will get to the upper 80s in the afternoon so I get an early start. I hate pan lubing more than casting. That said I need some more of my spitzers before the mid September Tacoma match so I had better suck it up and turn the pot on. 

Jack
  

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JHand
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Re: Casting large vs small bullets
Reply #10 - Aug 17th, 2026 at 5:32pm
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bpjack wrote on Aug 17th, 2026 at 1:19pm:
I hate pan lubing more than casting.

Jack


Maybe that was an advantage to getting my wife into the game, she punched the 200 bullets out of the lube block for me, and i can even get her to run the 45's through the lubrisizer!
  
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Re: Casting large vs small bullets
Reply #11 - yesterday at 10:24am
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Your % error on the two lots is only slightly smaller for the little guys; 0.19 % vs 0.48 % for the big guys.  Since the little guys are well less than half the size (weight) you are actually running tighter control on the big guys.  I used to go nutz with this when into BPCR 'cause the big boys were casting +/- 0.2 grains on 550 grainers.  After many pesky questions, it turns out that NOBODY casts that consistently, but everybody uses an electronic scale to sort them out.  Your bullets are fine-you will never be able to cast any tighter weight range.  have fun
  
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JKR
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Re: Casting large vs small bullets
Reply #12 - yesterday at 11:24am
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When I quit using a Lee pot and went to a PID controlled pot, I started getting much less variation in weight for my BPCR bullets.
  
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calledflyer
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Re: Casting large vs small bullets
Reply #13 - yesterday at 12:08pm
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I cast outdoors over a fire from a camp stove- almost primitive. 
I am just about certain that the temp from using this method has some variation- possibly quite a bit. I just watch how the mold is behaving. Time to freeze on the sprue plate and how the bullets drop. As long as it seems near consistent I continue. Of course, times like pot replenishment and potty breaks interrupt the procedure. I get back on track and it works fine.
I do weigh now and then, and seem to feel that on warmer days the consistency is more uniform than on cooler or those where the sun is shaded by passing clouds off and on. But the thing is, even with those ups and downs some think are not too good, the whole batch seems to shoot about the same if sorted or just all shot one big happy family of leaden relatives. I separate the ones obviously flawed with visible defects. I'm happy this way Roll Eyes
  
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JHand
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Re: Casting large vs small bullets
Reply #14 - yesterday at 12:27pm
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My dad just got a set of the aluminum locking handles from bufallo arms after I sent him Wayne's article. He tends to get more of a spread than i do. His first time with them, the cast us 84 for his 400gr 40-65 (that number bugs me, shoulda done 1 more at least) 

70 of them were within 1 gr, , the rest were within 1.5 with just a couple rejects. They also let him cast for longer not having to hold the handles together. I may have to try a set
  
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gunlaker
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Re: Casting large vs small bullets
Reply #15 - yesterday at 2:05pm
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I would disagree that no one casts super tight spreads like +/- 0.2 or 0.3gr.   I do it all the time.  If after the first 15 or so bullets, if they spread a lot more than that it's because I wasn't paying attention to the thermometer or my casting timer.  I just grabbed a couple of boxes of bullets off of the table.  Saeco #740's cast out of 20:1.  After the first 15, they are all 409.5 to 410.0gr so a spread of +/- 0.25gr.   A set of 540gr Money bullets I have 91 saved at 539.5 +/- 0.3gr.    The 32 cal bullets are generally a lot tighter than that.   I believe that just like shooting, casting gets better when you try to control all of the details. 

Chris.
  
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oneatatime
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Re: Casting large vs small bullets
Reply #16 - yesterday at 4:24pm
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What kind of a scale do you use? Is it digital?
  
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gunlaker
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Re: Casting large vs small bullets
Reply #17 - yesterday at 4:37pm
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oneatatime wrote yesterday at 4:24pm:
What kind of a scale do you use? Is it digital?


I've gone through a few scales over the years, but yeah digital.  I watch them for drift as I go.
  
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oneatatime
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Re: Casting large vs small bullets
Reply #18 - yesterday at 5:25pm
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Does it read out in .1 grain or in .2 grain?
  
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gunlaker
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Re: Casting large vs small bullets
Reply #19 - yesterday at 8:27pm
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0.1 grains
  
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JHand
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Re: Casting large vs small bullets
Reply #20 - yesterday at 9:29pm
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I use a frankford arsenal scale that goes to .1gr, but I don't think I'd trust it enough for powder. For bullets, its good enough,  and gives piece of mind that they are close
  
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oneatatime
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Re: Casting large vs small bullets
Reply #21 - Today at 1:33am
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Yes, plus or minus .05 grain should really be good enough.
  
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Re: Casting large vs small bullets
Reply #22 - Today at 8:12am
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Yeah I think most of our digital scales aren't that great.  If you don't watch them constantly they'll drift. I keep mine on 24 hours a day now which seems to improve it quite a bit.  I wonder if the really high end ones popular with the f-open and benchrest shooters are less susceptible to drift.
  
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