Black Powder cartridge question.

S

Straitshot

New member
I know some may think this is a dumb question, but when you mic a barrel for bullet size do you mic from the top of the lands or the bottom of the grooves to determine bullet size and how many thousands over if any would be the proper size?

Thanks, Louis
 
I am wanting to know concerning lead bullits for a Sharps rifle. Basically though, lead bullits for any rifle. I am trying to determine what size sizer die I need for my 40-70 and 45-70 Shiloh rifle.

Thanks for the replies.

Louis
 
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There is a lot of expertise on the Shiloh board at
http://shilohrifle.com/forums/index.php

I don't have a Shiloh but I load .411" bullets for my Browning BPCR .40-65.
It has a Badger barrel which is cataloged at .408" groove diameter. I think the .411" bullets do better because they fit the rather generous Browning throat and swage down into the bore.

I load .379" bullets for my Winchester Single Shot .38-55 largely because that is what the mould drops at. The barrel slugs .3785" with a long throat and I suspect it would do better with a larger bullet, but am now shooting the .40-65 most of the time and don't have the incentive to work hard on the .38.
 
Model-P,

For a revolver, you would be correct, but the OP didn't mention a revolver. He said a barrel.
Click to expand...

And that's exactly why I worded it the way I did....

Bottoms of the grooves + .001" or whatever it takes to fill the cylinder throats, whichever is larger.
Click to expand...

As a Sharps has no cylinder throats, .001" would be the larger of the two;). (See? The formula works fine for revolvers and rifles:D).
 
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