Originally Posted by spitfire_er
Long story short. I built another rifle (one for the wife this time) and used a FREE used barrel of unknown history. Re-cut the chamber, re-threaded and put a new crown on it. Only reason I used it, well other than being free, visually the rifling looks strong and super clean. I don't have a bore scope, but the bore measured .237" and .243" if I recall.
That being said, it is a 1-10" twist finished at 21" chambered in .243 Win, .655" at the muzzle. We shot the first couple "groups" with it yesterday with dismal results.
I hand load all my own ammo, but I had an old box of Federal premium with 95gr Noslers. Box says 3,030 fps, so with the shorter barrel, I'm assuming it's up at least 2,850-2,900 fps.
So here is the problem. I checked the entire rifle over, everything was tight and clean. Fully bedded and floated. Yet, those 95's didn't stablize. Shot 5 shots down range with about a 6" pattern. Walked down to find oval holes.
All of my other 10" barrels have handled these bullets without a problem. I'm going to try some lighter bullets to see what happens, but this has me thinking that maybe my Free barrel is JUNK!
I don't know, Any ideas?
Factory barrels are notorious for being finicky.
Sounds like the lands and grooves are fine so just try different loads. Start with one load and
have different primers then try the best primer and different bullets(Don't get tricky with seating
depths) seat to magazine length - .020. repeat the process with different powders @ approximately
the same velocity using the best bullet and primer you found.
This should get you a reasonable load to work with and change one thing at a time while you are
fine tuning the load.
Clean between each test load so they are in the same conditions(Cool Clean Barrel).
If it is a sporter weight barrel, #3 or smaller you may have to place a small amount of tip
pressure between the barrel and stock. (Poster board, cracker box, ETC)
Don't give up.
J E CUSTOM