Best alloy for long bullet

[hawkeye hugo]

I tried bullets with a 1-20 alloy tin/lead yesterday, resulting in a not better grouping. I shot with the same load of Swiss BP 2f - 55 grain.
I tried also pure lead bullets, same load, better results as the 1-20 alloy.
Bullets sized to load with tump press
Should I perhaps try shooting 3 f powder to bump up the 5% tin bullets?

 

[Josephg]

In my 38s, for target shooting I use about 40 grains. Usually OH shooting but have proved to be very accurate from the bench when sighting in.

 

[Old Hawkeye]

I tried bullets with a 1-20 alloy tin/lead yesterday, resulting in a not better grouping. I shot with the same load of Swiss BP 2f - 55 grain.
I tried also pure lead bullets, same load, better results as the 1-20 alloy.
Bullets sized to load with tump press
Should I perhaps try shooting 3 f powder to bump up the 5% tin bullets?

Definitely go to FFFg as it may get your bullets to obturate to groove diameter better. May reduce your fouling a bit, as well.

 

[swamperkk]

fffg pistol powder is the best way, that's all i use now

 

[Griz44Mag]

Hardness and pressure - time proven information based on 50 years of research by Richard Lee.
This is his pressure vs hardness chart.
TIN does have some effect on hardness, but is minor. But is absolutely great for making super smooth and shiny bullets.
According to my allow information -
Tin hardens lead by .1 BH per each 1 %
Antimony hardens lead at .9% per each 1%
A close check on hardness vs PRESSURE is the key to proper bullet hardness to prevent leading.
This information works, as I shoot lead bullets in my .308 up to 1800 fps using 24BH lead-tin-antimony without leading or fracturing.
The page below is from the LEE SECOND EDITION handbook on loading.

 

[Crow-Feather]

Will cast some 1-20 bullets and see what they do

My Gibbs shoots 1-20 with 100 grains 1 1/2 Swiss. 1 inch at 100 yds c to c. (benched)

 

[cannonball1]

I have a lot of pewter for end caps. does this work for a hardening bullet alloy.

 

[Griz44Mag]

I have a lot of pewter for end caps. does this work for a hardening bullet alloy.

Alloy content for pewter is very inconsistent. In bullets it would matter because accuracy is dependent on repeatability of all factors.
Without a repeatable alloy content - the will not be good consistency.
For end caps, it won't matter, for bullets it would.

 

[hawkeye hugo]

Did today some shooting with my 1-55 tin lead bullets, sized them. . 378, 5 instead of . 378, and used Swiss 3f instead of 2 f
Turned out fantastic, shot prone with sling 110 yards.
See picture