Black powder compression

Discussions of powders, bullets and loading information.

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Glen Ring
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Joined: Fri Jan 18, 2019 3:45 pm

Black powder compression

Post by Glen Ring » Thu Nov 14, 2019 5:14 pm

Does anyone know of a published finding on how compression of black powder has an affect/effect on velocity and SD?
There are those that talk, and those that act. Make a choice.

Clarence
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Joined: Tue Dec 24, 2002 7:38 pm
Location: Hill Country, TX

Re: Black powder compression

Post by Clarence » Thu Nov 14, 2019 7:14 pm

Glen,

I don't know about specific data, but I find that accuracy, velocity, and SD vary by rifle, powder lot, bullet, and whether the bullet is jumping or into the lands.

Clarence

Glen Ring
Posts: 874
Joined: Fri Jan 18, 2019 3:45 pm

Re: Black powder compression

Post by Glen Ring » Fri Nov 15, 2019 6:34 am

I am finding that to be true Clarence. I only shoot Pyrodex and in my 40-65 the load it loves is compressed about 1/16th of an inch and with a hard bullet. ( Thanks for including that tip in your book Wayne ) My 45-70 does NOT like a compressed load of Pyrodex. Jeanne has ordered a new 40-65 so we'll see what it likes. I hope to see you at 100% and chasing the antelope off the range this summer.
There are those that talk, and those that act. Make a choice.

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kenny s
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Location: Venice FL

Re: Black powder compression

Post by kenny s » Fri Nov 15, 2019 8:49 am

I used Pyrodex and sub's for years. They all said. Do Not Compress. Remember, they are basically smokeless and pressure can bump up a lot.
I would stick to good ol' BP. more accurate, safer, and you have to clean with both of them anyway. No benefit to using sub's .
Only me.....Ken

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