i have 2 340's currently. one 30-30 and one 340D in 222. i have had the 222 for about 50 years now. though several times i have swapped it off to a family member for something or other.
last time it came home I couldn't get it to group worth spit. i scrubbed the bore with lead remover and got dirty patches for over an hour. started thing i was turning it into a smooth bore.
it finally cleaned up and the rifling was sharp and shiny again. who shot lead through it i will never know.
after my cleaning efforts it shoots 1" or less at 100 yards from a rest.
the 30-30's i have had many over the years. some shot great and some were tomato stakes. the one i have now is very accurate with 150g silver tip hand loads. like 1"- at 100 yards. ticks off my friends with there AR's when that old 340 matches them at 100!
one 340 in 3030 i had in the 80's would make my nose bleed every time i shot it. finally mic'ed the bore and it was .300. squeezing those .308's down the barrel made the thing kick worse than my 338wm.
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