Pb2au
Active Member
I have an ongoing PP project for my Pedersoli Rolling block, 45/70.
In the process of working out the final diameter of the patched bullet, I came to the realization that the bore size of my barrel is relatively small in comparison. When measured, it came out to .445". Now mind you this was measuring the slugged lead with a pair of calipers, so there may be a wee bit of error, but close enough for the girls I dance with.
When I was developing the final patched diameter that would snug up into the bore, I arrived to a final size of .4445"-ish. So at least that mostly agrees with my slug measurement. I have a plan in place to more accurately measure the bore, involving 1) a chamber cast and 2) using a drill shank and wrapping brass shim to build up to a fit for the bore then measure.
So what I am getting at is that i was expecting a bore around .450-.451", but was surprised at the smaller dimension. The groove dim came it right at .4575", so no surprise there.
Anyone else run into a similar situation? Mostly just curious.
In the process of working out the final diameter of the patched bullet, I came to the realization that the bore size of my barrel is relatively small in comparison. When measured, it came out to .445". Now mind you this was measuring the slugged lead with a pair of calipers, so there may be a wee bit of error, but close enough for the girls I dance with.
When I was developing the final patched diameter that would snug up into the bore, I arrived to a final size of .4445"-ish. So at least that mostly agrees with my slug measurement. I have a plan in place to more accurately measure the bore, involving 1) a chamber cast and 2) using a drill shank and wrapping brass shim to build up to a fit for the bore then measure.
So what I am getting at is that i was expecting a bore around .450-.451", but was surprised at the smaller dimension. The groove dim came it right at .4575", so no surprise there.
Anyone else run into a similar situation? Mostly just curious.