I have been loading paper patch bullets for quit a few years now for the Shiloh Sharps. I have only used paper patched bullets with black powder loads. Are there any of you using them with smokeless loads. If so what loads have you tried in the 45-70 with 550 gr. paper patch bullets, and what was the results as far as accuracy.
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There is no problem with using smokeless powder to propel your paper patched bullets.
I'll have to refer you to your reloading manual for powder charges as I have not used a bullet that heavy in a Marlin because the bullet length tends to limit the powder capacity in a lever gun where the overall cartridge length is more important than it may be in your Sharps.
I have used smokeless with my Lee 500 grain FN that I make in to a PPB and used it in my 1895CB, But like Hudson said refer to your reloading manual. I also have loaded a 530 grain PPB with smokeless in my Sharps.
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I've used bullets as large as 405's in my .45-70. Good Mr. Janott sent me some larger ones, like you mention, but they are awaiting warm shooting weather to try this spring. I have loaded from 300 to 405's with Re-7, IMR 3031, and am about to try a Hogdon powder too. Seems like there were one or two other powders as well.
I've found that the information in the Hornady Manual most closely represents want I found (velocity wise) on my chronograph. (In other words, if it said that 50 grains of powder "x" with a 350 grain bullet was velocity "y", that is what I actually got with my ppb's over a chronograph. I can not verify pressure as I have not strain gauge, so use this information strictly at your own risk. Every gun is a little different, hope this can be of some use).
I have not tried any of these loads specifically, but many of them seem to mirror data I have used, if it is of any use.
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