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The Kaiser
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20/1 or. 30/1 difference?
Oct 29th, 2023 at 12:45pm
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Anyone notice any difference with this lead mix as far as accuracy?
  
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oneatatime
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Re: 20/1 or. 30/1 difference?
Reply #1 - Oct 29th, 2023 at 1:50pm
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Yes, with my 40-65 and BP at 300. Testing showed that 25 to 1 was a lot more accurate than 30 to 1 and 20 to 1 was a bit more accurate than 25 to 1. With a Paul Jones bullet in my 38-50 with BP had to go to 16 to 1 for best consistency at 500 meters.
  
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gnoahhh
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Re: 20/1 or. 30/1 difference?
Reply #2 - Oct 29th, 2023 at 2:42pm
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Ditto with one of my .32-40's (sans the 4-500 yard stuff). On the other hand another one definitely prefers 1:30.
  
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Schuetzendave
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Re: 20/1 or. 30/1 difference?
Reply #3 - Oct 29th, 2023 at 2:56pm
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I have used 20:1 Lead:Tin alloy for many decades using either smokeless powder or black powder.

Tommy Mason did years of testing and he found 22.5:1  was slightly more accurate than 20:1 or 25:1.
  
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SBoomer
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Re: 20/1 or. 30/1 difference?
Reply #4 - Oct 29th, 2023 at 4:37pm
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I have settled on 12BHn for my 32/35 with 17twist. I have done quite a bit of experimenting with various alloys, some with very different compositions but the same resultant BHn hardness. They shoot identical. I now “sweeten” the pot to achieve a certain hardness. I keep my double cavity 454664 mold handy as I am adjusting hardness(mix). The huge metplat makes for easy testing. The lead calculator on the Cast Boolits forum is wonderful for those of us somewhat math-challenged. Roll Eyes
  
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frnkeore
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Re: 20/1 or. 30/1 difference?
Reply #5 - Oct 29th, 2023 at 5:45pm
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SBoomer wrote on Oct 29th, 2023 at 4:37pm:
I have settled on 12BHn for my 32/35 with 17twist. I have done quite a bit of experimenting with various alloys, some with very different compositions but the same resultant BHn hardness. They shoot identical. I now “sweeten” the pot to achieve a certain hardness. I keep my double cavity 454664 mold handy as I am adjusting hardness(mix). The huge metplat makes for easy testing. The lead calculator on the Cast Boolits forum is wonderful for those of us somewhat math-challenged. Roll Eyes

Just curious. What length bullet are you shooting in that 32/35?

I did a lot of testing in my day and found that 30/1 could produce some very good groups but,when I would use it over a few month period, I would get unexplained fliers so I would go back to 20/1.

My last 5 years of shooting, I was using 22/1, just to save a little tin and couldn't tell the difference, between 20 & 22/1.
  
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SBoomer
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Re: 20/1 or. 30/1 difference?
Reply #6 - Oct 29th, 2023 at 6:17pm
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.985”. Its an Accurate 31-156C that I have modified to a pointed nose. Weight is now 165gr. Shooting it at 1331fps.
  
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frnkeore
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Re: 20/1 or. 30/1 difference?
Reply #7 - Oct 30th, 2023 at 2:06am
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I built 2 rifles in 32/35 (Hoch & 44 1/2) shot the Hoch for 10 years but,they were both 14 twist and I shot a 1.165 long Ron Long spitzer at 1400+ fps.

I bought another barrel to chamber in 32/35, it's a 15 twist 3 groove barrel,that I designed a NOE spitzer bullet for, 1.06 lg but,I never got around to put it on a rifle. 

All my barrels are .308 groove. The 32/35 is a over looked highly accurate cartridge! But, does take a little work to make cases.
  
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SBoomer
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Re: 20/1 or. 30/1 difference?
Reply #8 - Oct 30th, 2023 at 2:33am
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I strongly suspect that my 32/35 Tip-Up started life as a 32 Ideal. I rechecked my notes, and it is actually an 18 twist, not 17 as I indicated above. Groove is 312”.
  
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frnkeore
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Re: 20/1 or. 30/1 difference?
Reply #9 - Oct 30th, 2023 at 3:39am
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The 32 Ideal, had a .323 groove diameter.
  
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SBoomer
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Re: 20/1 or. 30/1 difference?
Reply #10 - Oct 30th, 2023 at 6:47am
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frnkeore wrote on Oct 30th, 2023 at 3:39am:
The 32 Ideal, had a .323 groove diameter.

You are correct, and I knew better. I was thinking 32cf of some sort but even then, the twist is wrong according to period Stevens and Ideal catalogs.
  
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Re: 20/1 or. 30/1 difference?
Reply #11 - Oct 31st, 2023 at 2:25pm
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Like that modified mold Boomer !
  
May the Bullet Gods be with you.......
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Re: 20/1 or. 30/1 difference?
Reply #12 - Oct 31st, 2023 at 2:45pm
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Compare hardness.   20/1 is about 9 BHN and 30/1 is about 8 BHN.  If there is a significant performance difference between the two alloys, it may be "castability" or some other factor than hardness.

CHRIS
  
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Fred Boulton
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Re: 20/1 or. 30/1 difference?
Reply #13 - Oct 31st, 2023 at 4:39pm
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If your bullets are actually throat/groove diameter then harder alloys will work. If marginally under, the bullet needs to be soft enough to upset and fully fill the rifling. Hard, undersized bullets cause leading.
Fred
  
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rgchristensen
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Re: 20/1 or. 30/1 difference?
Reply #14 - Oct 31st, 2023 at 6:34pm
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Fred Boulton wrote on Oct 31st, 2023 at 4:39pm:
If your bullets are actually throat/groove diameter then harder alloys will work. If marginally under, the bullet needs to be soft enough to upset and fully fill the rifling. Hard, undersized bullets cause leading.
Fred


I habitually use the largest bullets that will fit in a fired case.   In one (very successful) instance, the bullet was nearly 0.030" (sic) larger than groove diameter.
CHRIS
  
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