bainter1212
Member
- Joined
- Sep 17, 2012
- Messages
- 1,175
Hey folks,
I've got an old Mosin that was poorly counterbored, so I cut down the barrel and re-crowned with 11 degree target crown. I want to handload for this rifle once I get it finished, and I understand that these old Mosins often have bores that measure out larger than .308.
My question is this - is there any reason that the bore diameter can't be measured at the crown, now that it's nice and sharp? My calipers have jaws that are meant to measure "inside" , on the backside of the caliper. So far, measuring with the calipers has given me a consistent groove-to-groove reading of .3105. As always, I measured about 15 times, re-zeroing my calipers each time. A couple of times the # was different, however by far .3105 was the most consistent number that it came out to.
Can I rely on this number? If so, should I load .310 or .311 bullets?
Any response is appreciated, thanks a bunch guys.
I've got an old Mosin that was poorly counterbored, so I cut down the barrel and re-crowned with 11 degree target crown. I want to handload for this rifle once I get it finished, and I understand that these old Mosins often have bores that measure out larger than .308.
My question is this - is there any reason that the bore diameter can't be measured at the crown, now that it's nice and sharp? My calipers have jaws that are meant to measure "inside" , on the backside of the caliper. So far, measuring with the calipers has given me a consistent groove-to-groove reading of .3105. As always, I measured about 15 times, re-zeroing my calipers each time. A couple of times the # was different, however by far .3105 was the most consistent number that it came out to.
Can I rely on this number? If so, should I load .310 or .311 bullets?
Any response is appreciated, thanks a bunch guys.