I recently picked up an OAL gauge to play with and found in both my 22-250’s that the bullets don’t encounter the riffling till an OAL of 2.500” is reached (2.510 in my Savage 12 varmint 2.500 in my Remington 700 varmint) I know its debatable but from what I’ve been told and read it seems like something like .010-.020” off the rifling is desirable, the problem I’m finding is such measurements demand a COL much larger then the ones listed in the books, a little larger I could understand but for example the recommended COL for a 22-250 with a 52 grain AMAX is 2.350”, my rifles want 2.490” or so (assuming .010 off rifling) I’ve made some dummy rounds at the 2.490” length and they chamber perfect, no harder to close the bolt then with a 2.350” OAL, also after ejecting there is absolutely no signs the bullets are touching the rifling.
So my question is does this sound right, is it possible to have a proper COL that far off book specs, also what is the recommended length needed for a good crimp, these 2.490” rounds are noticeable longer, I measure about .200” of bullet inside the case and about .070” is sub diameter due to the boattail leaving just .130” of full diameter in the case neck, due to the rate of twist I’m unable to go much larger(longer) then 60 grains, would love to be able to run the 75 grain AMAX’s that I toss in the AR from time to time.
Any confirmation on this being ok and normal would be much appreciated, I think I’ve thought this out but would rather toss it bye some folks that have been doing this a bit longer, thanks again for any help!
So my question is does this sound right, is it possible to have a proper COL that far off book specs, also what is the recommended length needed for a good crimp, these 2.490” rounds are noticeable longer, I measure about .200” of bullet inside the case and about .070” is sub diameter due to the boattail leaving just .130” of full diameter in the case neck, due to the rate of twist I’m unable to go much larger(longer) then 60 grains, would love to be able to run the 75 grain AMAX’s that I toss in the AR from time to time.
Any confirmation on this being ok and normal would be much appreciated, I think I’ve thought this out but would rather toss it bye some folks that have been doing this a bit longer, thanks again for any help!