IMR POWDERS IN THE 45-70 B.C.

[lonewolf5348]

 
I use IMR 3031 in my 45-70 with a soft cast .460 405 FP
bullet with a BHN of 10: My charge of 3031 runs between 34 @ 35.5 no fillers bullets drop right in on target at the 100 yard.I was wondering how IMR 4198 or even 4064 would work in the 45-70: I found the 3031 is real dirty but cleans right up easy also find a few grains of unburn powder down the barrel. I tried a little more crimp on the case also went to a mag: primer but still seem to have unburn powder in the barrel.
The gun is a Buffalo Classic which seems to shoot better with the more lead that goes down the barrel.
I first started with 405 FP in .458 they shot O.K. then bump up to .459 thay shot a little better ,seem .460 shoot the best so far.

[CyberSniper]

IMR-4198 works well also.
With lower pressure loads, the powders do not burn
as clean as they would at higher pressures.
That's just the way it is.

[georgeld]

4895 is another that's nearly the same.
I use it, 3031, 4064 all interchangably without problems
in several calibers.

George