I recently had my Remington 700 .308 blueprinted and re-barreled. I have an AICS stock and he had to set back the inlet for the recoil lug .006" in order to compensate for the few thousandths he took off of the action face while truing the action. He also had to open up the screw holes in the stock as the action screws were contacting the stock. Before he modified the stock he found that the action was barely contacting the stock and was binding at front of the action because the stock was too long from the rear action screw hole to the back of the recoil lug inlet. I know this is common practice as the stock is built for a factory action's length. Has anyone else had to do this with an AICS build?
While working up a test pack, I measured the throat with a Hornady OAL gauge. I found that I could load out to 2.798" (2.800" is SAAMI spec for .308 Win.)
So I worked up a test pack with different amounts of jump, from .005"-.030" in .005" increments. What I noticed was that even with .030" of jump, I am still getting rifling marks on the bullet as if it is contacting the lands, when in fact, it should not be contacting anything.
I can't understand how this can be and I don't know if it is normal. I haven't been able to get the rifle to shoot as well as I would like yet. My best 5 shot groups have been with FGMM and were .4" at 100 yds. though FGMM isn't consistently sub-.5" at all. It shoots anywhere from .75"-.4". I keep getting unexplainable fliers with FGMM and my handloads as if there are pressure spikes from the bullets being jammed into the lands. I am very careful with my handloads, I weigh on a scale that is accurate to .002 grains which allows me to weigh my powder with kernel to kernel accuracy. I also weigh and sort my bullets and brass.
I was recommended to go to this particular gunsmith from 2 very reputable sorces who have had guns built by him, so I am in doubt that he made a mistake, but no one is perfect.
How could the gunsmith have cut the chamber incorrectly? What can I have him go back and check? What else do you think?
Thanks a lot!!
While working up a test pack, I measured the throat with a Hornady OAL gauge. I found that I could load out to 2.798" (2.800" is SAAMI spec for .308 Win.)
So I worked up a test pack with different amounts of jump, from .005"-.030" in .005" increments. What I noticed was that even with .030" of jump, I am still getting rifling marks on the bullet as if it is contacting the lands, when in fact, it should not be contacting anything.
I can't understand how this can be and I don't know if it is normal. I haven't been able to get the rifle to shoot as well as I would like yet. My best 5 shot groups have been with FGMM and were .4" at 100 yds. though FGMM isn't consistently sub-.5" at all. It shoots anywhere from .75"-.4". I keep getting unexplainable fliers with FGMM and my handloads as if there are pressure spikes from the bullets being jammed into the lands. I am very careful with my handloads, I weigh on a scale that is accurate to .002 grains which allows me to weigh my powder with kernel to kernel accuracy. I also weigh and sort my bullets and brass.
I was recommended to go to this particular gunsmith from 2 very reputable sorces who have had guns built by him, so I am in doubt that he made a mistake, but no one is perfect.
How could the gunsmith have cut the chamber incorrectly? What can I have him go back and check? What else do you think?
Thanks a lot!!