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Very Hot Topic (More than 25 Replies) Single vs. multi cavity moulds/ladle v bottom pour (Read 25007 times)
stubbicatt
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Re: Single vs. multi cavity moulds/ladle v bottom pour
Reply #15 - Aug 31st, 2015 at 5:11pm
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Cat_Whisperer wrote on Aug 31st, 2015 at 11:58am:
ONE recommendation.

Which ever method of casting you employ, improve your consistancy (weight et al.) by (at least until your technique gets GOOD, weigh each bullet AS YOU CAST THEM. 

Instant feedback to your timing etc.



How do I pick up the hot little buggers? Salad tongs or something?

Thanks.
  
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calledflyer
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Re: Single vs. multi cavity moulds/ladle v bottom pour
Reply #16 - Aug 31st, 2015 at 6:55pm
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You needn't remain single- just get her to do your casting so you can devote full time to shooting the little buggers. Then you could let her solve the problem of picking up the hot slugs, too. 
Oh, I almost forgot- make her use a single cavity mold, 'cause they are much better.
  
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JLouis
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Re: Single vs. multi cavity moulds/ladle v bottom pour
Reply #17 - Aug 31st, 2015 at 7:56pm
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I personaly would not attempt to weigh each bullet as they are cast and you would better seved to do that after the fact. I use an Ove Glove to break the sprue, its flexible and is good for about 450 and is more than enough. I shoot my bullets in the order as cast so I do pick each one up and place in my casting block in the proper order while the sprue frosts over on the one still in the mould. If you are not aleady there, there will become a point in time where weighing is no longer required. Jerry_H on this site myself and few others no longer have the need to weigh bullets. Jerry_H's 7ea. 250's with his 25WCF at 200yds. as well as the success of others in our group should be enough to quantify these comments in regards to one reaching that point in time and then maybe not in the minds of others? In that case each individual should do what works the best for them and they should disregard what has been stated.

JLouis
  

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uscra112
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Re: Single vs. multi cavity moulds/ladle v bottom pour
Reply #18 - Aug 31st, 2015 at 10:40pm
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Cat_Whisperer wrote on Aug 31st, 2015 at 11:58am:
ONE recommendation.

Which ever method of casting you employ, improve your consistancy (weight et al.) by (at least until your technique gets GOOD, weigh each bullet AS YOU CAST THEM. 

Instant feedback to your timing etc.



Without a second pair of hands, how would you do that and still keep the mould hot?
  

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shovel80
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Re: Single vs. multi cavity moulds/ladle v bottom pour
Reply #19 - Aug 31st, 2015 at 11:40pm
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uscra112 wrote on Aug 31st, 2015 at 10:40pm:
Cat_Whisperer wrote on Aug 31st, 2015 at 11:58am:
ONE recommendation.

Which ever method of casting you employ, improve your consistancy (weight et al.) by (at least until your technique gets GOOD, weigh each bullet AS YOU CAST THEM. 

Instant feedback to your timing etc.



Without a second pair of hands, how would you do that and still keep the mould hot?


It's really not difficult. I used to weigh each bullet right out of the mold when I first started casting...I don't feel the need to do that anymore. Although I weigh the first several bullets until my mold and bullet weight levels out to the normal weight for that mold. After that , I may weigh a bullet after each 25 or so just for my own curiosity. I also shoot my bullets in the order cast.
Terry
PS...I believe that the majority of shooters use single cavity molds with a ladle..
  

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Schuetzenmiester
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Re: Single vs. multi cavity moulds/ladle v bottom pour
Reply #20 - Sep 1st, 2015 at 1:48am
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single with a lade here  Smiley  Keep your bases sharp on the edge and you will be fine.
  

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bnice
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Re: Single vs. multi cavity moulds/ladle v bottom pour
Reply #21 - Sep 1st, 2015 at 7:49am
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One recommendation, if you don't have a thermometer in your pot (or a PID controller) I would get one, try to hold a consistent temp helps
  
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stubbicatt
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Re: Single vs. multi cavity moulds/ladle v bottom pour
Reply #22 - Sep 1st, 2015 at 8:04am
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Again, thanks fellas. 

Lots of good information here.
  
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Cat_Whisperer
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Re: Single vs. multi cavity moulds/ladle v bottom pour
Reply #23 - Sep 1st, 2015 at 10:01am
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uscra112 wrote on Aug 31st, 2015 at 10:40pm:
Cat_Whisperer wrote on Aug 31st, 2015 at 11:58am:
ONE recommendation.

Which ever method of casting you employ, improve your consistancy (weight et al.) by (at least until your technique gets GOOD, weigh each bullet AS YOU CAST THEM. 

Instant feedback to your timing etc.



Without a second pair of hands, how would you do that and still keep the mould hot?


Easy. (weighing becomes part of the cooling time for the mould)
Pour, set mould to cool.
Pick up previous bullet from towel and place on scale, move to coolilng rack.
Pick up mould and break out bullet onto towel.
repeat.
  

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marlinguy
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Re: Single vs. multi cavity moulds/ladle v bottom pour
Reply #24 - Sep 1st, 2015 at 10:54am
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I bottom pour also, and have done so for many decades. As for stopping; I leave the last bullet cast in my mold if I have to stop to sort, or move things around. It keeps the molds from cooling down too far, and having to possibly toss the first bullet again.
I don't weigh as I cast, but if I did I'd simply leave a bullet in the mold to keep the mold warm.
  

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Re: Single vs. multi cavity moulds/ladle v bottom pour
Reply #25 - Sep 1st, 2015 at 11:42am
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For precision molds, generally use single cav.
But, I do have several two cav molds that cast Excellent bullets, and the cavities are Very well matched.

BUT, One can simply make a minor nick in one cavity near the nose.
so that the bullets are easy to identify. Then one can 
cast, lay the bullets in order cast-I cover the bench with a wool blanket, and then later after cooling, I go across the line and separate out bullets from each cavity as I box them up.

Also, my usual technique is to cast with Two molds. Filling one while the other cools. So, I am not wasting time waiting for a single mold to cool.  Getting very consistent bullets, too. I like to cast with two molds that have bullets reasonably close to similar wt.  e.g. I would not cast 200 gr 30 cal bullets along with 536 gr Postells. Because of difference in cooling rates.
beltfed/arnie

  
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JLouis
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Re: Single vs. multi cavity moulds/ladle v bottom pour
Reply #26 - Sep 1st, 2015 at 4:48pm
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I just finished casting a batch of bullets for the upcoming match. I have never paid any attention on how long it takes so I made note of it today. I cast 118 bullets a session should I find any with visual deffects to end up with a 100 match quality and that is the only sorting I do. I also haven't weighed bullets for years but I did so today to share my findings. Casting time 28 minutes roughly 4.5 bullets per minute, weight variation 3 tenths. These were cast at my normal relaxed pace, I did not push to see how fast I could do it. But if I were to slow down the pace to let the sprue set longer than required my weight variation would not have been acceptable and the whole lot would have ended up back in the pot based on my 15years of casting experiance.

Single cavity mould and ladle poured.

I hope this is helpful to a new caster, once the sprue has set you cannot go to fast,
but to go any slower would probably require you to continue weighing your bullets. 
My acceptable match as well as practice tolerance is 4 tenths and I do not keep any left over bullets from a session for foulers they all go back into the pot.

JLouis
  

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Re: Single vs. multi cavity moulds/ladle v bottom pour
Reply #27 - Sep 1st, 2015 at 11:26pm
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One recommendation for a new caster. new mold or (in my case) a new pot (I mourn the passing of my 18 yr old Rapine 20 lb pot.) is to weigh your bullets AS CAST at least for a while.  This can give you a good idea on how long your mold takes to heat up and will show your consistency.  A 5 minute distraction can cause a big change in weigh until the mold get back to temp.  While I am not casting quite as fast as John Louis, we have about the same variation in bullet weights.  A good rhythm is essential.

Jack

  

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stubbicatt
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Re: Single vs. multi cavity moulds/ladle v bottom pour
Reply #28 - Sep 2nd, 2015 at 8:25am
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I'm sure its a temperature issue, but any of you fellas find that if you leave the ladle nozzle in the sprue-plate taper for more than about 3 seconds the melt in the ladle solidifies for a second, and then pours out to make the sprue?

This first batch of 323 bullets I was casting at a target of 725* . Perhaps I should set the temperature a little higher on the pot, I'm not sure. I've read that the higher the temp, the quicker the tin separates and maybe even evaporates, from the melt. That's something I'm trying to avoid.

Ah well. I'll continue to experiment, once my RCBS Pro Melt returns from warranty.

Good advice re: weighing bullets for awhile. Also good advice of laying them out in the order they were cast, as then I can get a feel for the number of rejects before the setup starts to cast good bullets. 

Glad you guys are here to offer your experience and advice.
  
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Re: Single vs. multi cavity moulds/ladle v bottom pour
Reply #29 - Sep 2nd, 2015 at 9:02am
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I would try increasing the temperature a bit.  My Saeco molds work well at 800 degrees.

Chris.
  
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