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Discussion Starter #1
I just got through slugging and measuring the groove diameter of my Buffalo Classic 45-70. I checked it three times as I didn't believe the measurement on the first tries but it was the same the third time. It measures .4566 for the groove diameter. I thought this was a little small, I think I should be using .457 Cast bullets for it. Does this coincide with any of your Handi-Rifles? Is it usual for the H&R to have the groove diameter smaller than .457?

fknipfer
 

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What's it measure at the lands? You should be shooting .001-.002" larger for best accuracy, .458" would be my choice.

Tim
 

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Discussion Starter #3
Its a lot easier to use mic's to measure the od of the groove, but here goes on the lands as good as I can measure .4515. or .452 does this sound correct or close. I can only use calipers for the lands. I try again to confirm this number.


fknipfer
 

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That's close enough, thanks. I can drop a .452" bullet down a couple of my 45-70 barrels but the other two take a bit of force to make it go thru, so that's about right.
Tim
 
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