Poor accuracy , need help.

I had a custom 300 PRC built that wouldn't shoot smaller than an inch and a half no matter what. I swapped out the scope, scope rings, loaded for it with converted 375 ruger brass. Then when ammo came out, factory ammo, then reloads, then ADG brass, Lapua etc... it just didn't like anything and the best i could do was about 1.5" at 100. The rifle was shoved in the back of my gun safe for years.

I purchased an MPA 300 PRC hybrid hunter and out of the gate it was a 3/4 moa rifle with factory ammo. This summer, while load developing for the MPA and preparing for hunting I stripped some parts from the old 300 PRC, scope, level, rings, bipod...all of the lighter weight parts. While reassembling the original rifle with the heavier parts, I went through and loctited and torqued everything and low and behold...the front screws of the scope rail were finger tight, no loctite, bedded scope rail, all work done by a highly regarded gunsmith.

I also have noted that my MPA shoots in the .5s and high .4s with a brake and eventhough it kicks like a mule, it shoots in the .2s for 3 shots, low .3s for 5 shots in a row...carbon wrapped barrel pushing 245s fast.

My long winded way of saying, check your scope rail, rings, then scope. Then check without a brake, make sure your scope rings are seated forward when torqued. Make sure your action is seated fully rearward when tightening. Tighten in increments, front to rear and make sure the front is fully tightened before the rear.

Lastly, if the rifle isn't adjustable and properly adjusted, you're likely the culprit. You have to be able to mount and drive the rifle repeatabley to know if it's truly the rifle system or you.

With all the years of experience I have, I relegated an expensive custom rifle to the life of a safe queen just because it never crossed my mind to check the scope rail...so stupid, so obvious and simple...but in all the scope swaps and other crap, I never checked the scope rail screws. Check the simple stuff.

Best of luck to you
 
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