Probably the best bullet in your marlin is going to be something arround 350-450gn as far as I understand they don't like super heavy bullets honestly the chances of you pulling off 1000 yards with a marlin lever action is about the same odds as the pope not being catholic
The 1000 yard bpcr shooting is done with stuff like sharps rifles with very long barrels and generally larger than 45-70.....45-90 or 45-110 normally that gives you the ability to run 600-700gn bullets and still ave enough room in the case for a decent charge of powder
The targets are massive but they still stuggle to hit them normally
I shoot a h&r springfeild trapdoor copy for bpcr
I shoot a 420gn lyman bullet
And I have just brought a mold for the original 1873 government bullet which is a 405gn hollow base
I have 420's here so if you pm me your address ill send you some
I haven't cast any 405's yet but can send you some when i do
Cheers
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