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Very Hot Topic (More than 25 Replies) Alloy Percentages (Read 27373 times)
marlinguy
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Re: Alloy Percentages
Reply #30 - Feb 18th, 2019 at 7:30pm
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JS47 wrote on Feb 18th, 2019 at 6:47pm:


Shooting into a snow bank seems to work very well. Depending on the snow, velocity, etc. the bullets travel 3 or 4 feet. The downside is I have to wait until spring to find the bullets. The other downside is that there isn't any snow here in Southern Arizona.

JS




Even snow has some effect on bullet shape, or it wouldn't stop a bullet. Since nose slump is so slight, I still can't see how you'd know if it was snow or the bullet's alloy causing the slump.
  

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JLouis
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Re: Alloy Percentages
Reply #31 - Feb 18th, 2019 at 7:56pm
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Snow to me would not be a very accurate way to go. Building a catch box using the proper catch material would be the only accurate way if one wants to truly seek the accurate information that he might want to know.
« Last Edit: Feb 18th, 2019 at 8:01pm by JLouis »  

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RSW
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Re: Alloy Percentages
Reply #32 - Feb 18th, 2019 at 8:43pm
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In conducting shooting experiments for his book The Bullet's Flight from Powder to Target, Dr. FW Mann found that oiled sawdust (maple or birch) would catch fired bullets with only slight surface scuffing. He used light oil to fully wet the sawdust but not so much that it would clump. A .32-40, 187 grain bullet fired at 100 yards would penetrate 4-5 feet into the sawdust. From a photo of his catch box shown in the book, it appears to have been about 12 inches square, with a length of greater than 6 feet. That's my estimation from the photo, no dimensions were given. Typically, his .32-40 loads were duplex topped with an Oleo wad.
Dr. Mann used this method to catch many hundreds of bullets during his years of shooting experiments. My guess is, that same method should work as well now as it did at the beginning of the 20th century.
  

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marlinguy
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Re: Alloy Percentages
Reply #33 - Feb 18th, 2019 at 8:45pm
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It would seem to me the only accurate way would be to catch the bullet as it ran out of steam and had slowed down so much that when caught it wouldn't deform it. Even water can deform bullets. The right media is what?
Anything that will take a bullet traveling 1300-1400 fps and stop it in the length of a box will deform it too. Maybe not much, but then nose slump isn't much either.
  

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bnice
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Re: Alloy Percentages
Reply #34 - Feb 18th, 2019 at 9:55pm
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we (Gov. R&D lab) used a box that was similar (8 ft long) and used cellulose insulation, but that was jacketed bullets. worked great. Metal detector easy to find. Lead I would still expect slight deformation especially if nose is susceptible to slump from casting and firing.
  
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Schuetzenmiester
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Re: Alloy Percentages
Reply #35 - Feb 18th, 2019 at 11:09pm
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oneatatime wrote on Feb 18th, 2019 at 5:13pm:
SM, 500 meters.


If we had know about nose slump and increased BC with paper patch back in '95, we might have beat the Canadian with their Martini target rifles and Central sights in Ottawa ?  Cheesy

I only had very limited access to a  practice / test range long enough to test that if I had even thought about it. 

I suppose my experience with the 30:1 getting better results closer to the 20:1 at 200 yds probably is related to the lube and not alloy changes.
  

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Re: Alloy Percentages
Reply #36 - Feb 19th, 2019 at 12:49am
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More 1915 discussion about bullet slump (4 pages) with 1:20 - 1:30 and 1:16 pictures ... 

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JLouis
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Re: Alloy Percentages
Reply #37 - Feb 19th, 2019 at 11:27am
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Might fit the needs of anyone interested in catching lead bullets.

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Re: Alloy Percentages
Reply #38 - Feb 19th, 2019 at 11:53am
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JLouis wrote on Feb 19th, 2019 at 11:27am:
Might fit the needs of anyone interested in catching lead bullets.

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That would be easy enough to copy for a fraction of their price.
  
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marlinguy
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Re: Alloy Percentages
Reply #39 - Feb 19th, 2019 at 11:55am
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Christmas is coming! Just what everyone needs in their gun room!
  

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JLouis
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Re: Alloy Percentages
Reply #40 - Feb 19th, 2019 at 12:31pm
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Yep and the last thing anyone needs when the Target can tell an individual what truthfully works the best. The rest of it can be found in Mann's book and it all boils down to a perfectly balanced bullet of which even he could not achieve. The goal is to get as close to it as one possibly can and the closer you get the better the accuracy and that's where the alloy comes into play.
  

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SgtDog0311
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Re: Alloy Percentages
Reply #41 - Feb 20th, 2019 at 10:56am
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I’m using 16:1 for Money bullets and 20:1 for most other BP castings.   I work mostly with WW+2%Tin for smokeless, Dan Theodor mix for a few longer profile with smokeless, and the first two mentioned with BP dedicated bullets.

For some reason I’ve had lingering leading issues with the BACo Creedmoor out of two 40-65s.    Not sure if its related to alloy or fit but I’ve shot three alloys there and tried different fits.  What should work so far has not eliminated leading.   Kind of soured me on bore riders with significant groove-diameter bore-riding dimensions in the section of nose just in front of the forward driving band.   

I scaled a Postell to a weight I desired, and made some other changes to the base band, for my Ballard 45-70 and had BACo make a mould (now in their catalogue) that eliminated the groove diameter bore-riding section from the nose and leading disappeared.    Go figure.    Conclusions would be questionable.   

There is a good thread over on Castboolits that poses some of the same discussion:
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I wish I could recall some of the links to Kurt’s (Leadpot on Castboolits) pictures of bullets retrieved from snow banks over on Shiloh or BPCR forums.   He is meticulous in his efforts and his pictures lead me to believe there is good efficacy in the snowbank-recovery method.   What distortion you’d have would be hard to measure judging from the visual integrity of his recovered bullets.   
  

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Re: Alloy Percentages
Reply #42 - Feb 20th, 2019 at 11:13am
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Myers ... You Owe, looking back in 9 years of BPCR New Issues, Winter 2010, Issue 72, Dan's article ... A Surprising Alloy Test Result -

I wonder if there is something strange with the 96-2-2 alloy.

Everything I have read in the past says Tin Lead Antimony alloys age soften, including this article:

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An interesting counter article (patent) for hardening lead alloys. However it only shows what happens to 96hrs. Long tern, I suspect it still undergoes a reduction in hardness.

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« Last Edit: Feb 20th, 2019 at 12:58pm by TheGimp »  

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gunlaker
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Re: Alloy Percentages
Reply #43 - Feb 24th, 2019 at 9:29am
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I have never tried the alloys with antimony, but when I had a couple of chambers cut with Dan's reamers he sent me some testing results with his paper patched rifles. He ultimately decided that 16:1 worked better than the alloys with antimony.   But then bore diameter patched bullets are a slightly different animal then full diameter grease grooved bullets.

Chris.
  
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Schuetzendave
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Re: Alloy Percentages
Reply #44 - Feb 24th, 2019 at 11:09am
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For a number of years I shot only 20:1 lead:tin.

Many other Schuetzen shooters claimed that the softer 25:1 provided better accuracy.

So I shot 25:1 for two years and compared my scores prior to switching.

The softer alloy dropped my scores by 1.1 points per target.

I switched back to 20:1 and my scores went back up.

Alloy changes results in minor changes so it takes a large sample size of numerous shootings to determine which is better for your firearm.

I also shoot 20:1 in my Black Powder rifles as well.

When I first started shooting I used an alloy with antimony by mixing my lead with linotype.
Continuously for the first couple of years of shooting I always had leading of my barrel within 30 shots.

Quit using antimony and my lead:tin alloy would always go over 100 shots without any leading.

Dave Scovill: Handloaders Bullet Making Annual: 1990:

- lead:tin alloys soften over 90 days whereas lead:tin:antimony alloys harden over 90 days.
- antimony alloys can be hardened quicker by heat treating but requires traces of arsenic

All of Dan T. antimony alloy bullets compressed more than the lead:tin alloy.

It would have been more interesting if he had included other mixes of lead:tin  in his tests as well.
« Last Edit: Feb 24th, 2019 at 11:31am by Schuetzendave »  
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