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I hope you guys can help me out. I have a Marlin 336 (3/4 tube gold trigger) in .35 cal of early 1950’s manufacture that was a good shooter. After shooting some handloaded .357 pistol bullets (jacketed sierra) loaded on to .35 cases through it, I am having trouble with keyholing and grouping with normal .35 loads. Now when loading .357 bullets, to properly seat the bullet you need to load the cartrage quite a bit below maximum overall length, could this have affected the throat of the action causing the keyholing of normal .35 loads, or would the increased velocity of the light pistol bullets caused or damaged the micro groving due to fouling or burning out the barrel. Like I said it was a good shooter, now its keyholeing even at 25 yards.
Thanks
PS. after a good cleaning with Butches Bore Shine I saw no signes of copper fouling and the barrel looked good.
I hope you guys can help me out. I have a Marlin 336 (3/4 tube gold trigger) in .35 cal of early 1950’s manufacture that was a good shooter. After shooting some handloaded .357 pistol bullets (jacketed sierra) loaded on to .35 cases through it, I am having trouble with keyholing and grouping with normal .35 loads. Now when loading .357 bullets, to properly seat the bullet you need to load the cartrage quite a bit below maximum overall length, could this have affected the throat of the action causing the keyholing of normal .35 loads, or would the increased velocity of the light pistol bullets caused or damaged the micro groving due to fouling or burning out the barrel. Like I said it was a good shooter, now its keyholeing even at 25 yards.
# October 14th, 2009 at 7:34 pmThanks
PS. after a good cleaning with Butches Bore Shine I saw no signes of copper fouling and the barrel looked good.