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Buddys father in law shots 405 grain grain bullets from his 45/70 Contender. I do not know the powder and load but I know he did load testing for the 350 grain bullets and he had problems with them.
 

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There are so many different things you can do with a 45-70. The barrel length is important. You really need a faster burning powder for the 45-70 on a pistol. And it is still very tough to outperform a 45 Colt with the 45-70 in the shorter barrel. It can be done, but there is not a lot of difference. I would go with the 405 grain cast bullet, and a fast burning powder. In order to generate a little more pressure I would also go with a heavy crimp on the bullet. That is if you really want the most performance you can get from a short barrel. Are you wanting the most performance, or just a fun shooting middle of the road load??

Crimping in a single shot rifle can be a Ya or Nay. Again it depend on what performance you want. I find that I get better powder burn when I put a heavy crimp on my ammunition. I could not get my 45 Colt to shoot without(in a rifle) a heavy crimp. When I went to the heavier crimp in the 45 Colt the rifle did great.

In my High Walls in 45-70 I do not crimp, and I shoot 40.0 grains of RL7. It burns all the powder in the longer barrel. But this load does not burn completely in a short barreled Encore handgun. However I have never tried crimping this load. I might just try that to see what it does. Tom.
 
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