I purchased a m76 .308 which was well used and with a very worn barrel a few years ago. It shot fairly poor groups first time to the range. I checked it over more closely and noticed the rifling in the last cm looked particularly erroded and uneven in wear. I cutoff 1.5 to 2 cm with a hack saw and then squared up with a file and dimond file, rounded off the inside of the lands at the muzzle with a ball bearing and fine emery paper. Back to the range and it was deadly accurate with the same ammo.They seem to be well made barrels even back then. The bedding on these old rifles could well need re-doing after decades of being the wood being compressed.
Cheers.
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