Looking at the answers, it is probably the barrel. I also have a .243 99' Savage and I did not want to reload. I bought "The big Three" to find a box of hunting ammo. I could not believe how bad the Winchester and Federal shot. 7" to 8" groups at 100 yards. I tried the Remington and it came right in. The Winchester and Federal were way hotter. I could tell by the "Stickey" extraction. Some guns are just finicky about ammo.
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