I got back from the range a while ago, sighting in my Remington R-25 because it has acted strangely. And it did, again.
Normal five shot 100yd groups were about .75", with Magtech 150gr factory ammo. They open up to about 1" average with cheap, old german surplus ammo and at worst they're 1.5" with south african suplus stuff. No problem there.
However, every now and then the groups open up considerably, no matter what ammo I'm using. Up to 5" and I mean they're consistently all over the place. It happens both hot and cold, after just a few rounds or after half an hour of almost continuous shooting.
Barrel crown is pristine, so is the bore as far as I can tell. I though it might be copper fouling and cleaned the bore with foam, three times. Didn't help. Free float tube isn't binding, neither is the gas tube. I shoot from a sandbag rest, current scope is Meopta 4-12x50 which keeps zero flawlessly on another rifle, I've also tried Zeiss Conquest 3-9x40 which didn't help. The barrel isn't worn out, I've only shot about 300-400 rounds through it and I'm running out of explanations for what's going on.
Any ideas what to check next are very welcome. I really like this rifle, it's been very accurate so far and unexplainable sudden loss of accuracy sounds very strange.
Normal five shot 100yd groups were about .75", with Magtech 150gr factory ammo. They open up to about 1" average with cheap, old german surplus ammo and at worst they're 1.5" with south african suplus stuff. No problem there.
However, every now and then the groups open up considerably, no matter what ammo I'm using. Up to 5" and I mean they're consistently all over the place. It happens both hot and cold, after just a few rounds or after half an hour of almost continuous shooting.
Barrel crown is pristine, so is the bore as far as I can tell. I though it might be copper fouling and cleaned the bore with foam, three times. Didn't help. Free float tube isn't binding, neither is the gas tube. I shoot from a sandbag rest, current scope is Meopta 4-12x50 which keeps zero flawlessly on another rifle, I've also tried Zeiss Conquest 3-9x40 which didn't help. The barrel isn't worn out, I've only shot about 300-400 rounds through it and I'm running out of explanations for what's going on.
Any ideas what to check next are very welcome. I really like this rifle, it's been very accurate so far and unexplainable sudden loss of accuracy sounds very strange.