Barrel Alignment or........??
Nov 8, 2015 16:35:41 GMT -5
Post by dannoboone on Nov 8, 2015 16:35:41 GMT -5
Subject rifle is the 10MLII.
When new with factory barrel, there wasn't enough scope
adjustment for vertical (don't recall too low or too high).
I shimmed one of the bases for correction. After the first
season, I replaced the shim and used Burris Signature rings
with offset inserts for the correction.
Factory barrel got replaced with .458 barrel, and the
ring offsets had to be offset the opposite direction for
correction.
Later decided I wanted a dedicated .451 barrel, so:
Replaced that barrel with a .451, and added a Vortex Viper.
It then shot 15" to the left! So far, cannot get Signature
offset inserts in 30mm other than those which come with the
rings. The 10* offset did get the job done, however, but
with quite a bit of scope adjustment. I later changed the
breech plug and had to readjust the barrel for headspacing
the new plug. I replaced the 10* offsets with the regular
0* offsets. POI changed to shooting 15" high!
If barrel threading in the action was not true, would it not
shoot the same direction relative to aim point with each
barrel (assuming barrel threads are true)?
The factory recoil lug was replaced with a better after-market
lug.
I'm beginning to wonder if the problem is the barrel nut? Is
it possible it needs to be trued? How can one check it to
see if that is the problem?
When new with factory barrel, there wasn't enough scope
adjustment for vertical (don't recall too low or too high).
I shimmed one of the bases for correction. After the first
season, I replaced the shim and used Burris Signature rings
with offset inserts for the correction.
Factory barrel got replaced with .458 barrel, and the
ring offsets had to be offset the opposite direction for
correction.
Later decided I wanted a dedicated .451 barrel, so:
Replaced that barrel with a .451, and added a Vortex Viper.
It then shot 15" to the left! So far, cannot get Signature
offset inserts in 30mm other than those which come with the
rings. The 10* offset did get the job done, however, but
with quite a bit of scope adjustment. I later changed the
breech plug and had to readjust the barrel for headspacing
the new plug. I replaced the 10* offsets with the regular
0* offsets. POI changed to shooting 15" high!
If barrel threading in the action was not true, would it not
shoot the same direction relative to aim point with each
barrel (assuming barrel threads are true)?
The factory recoil lug was replaced with a better after-market
lug.
I'm beginning to wonder if the problem is the barrel nut? Is
it possible it needs to be trued? How can one check it to
see if that is the problem?
