So in my looking I've found that.... well there's not a lot of info.

specifically the pictures I've seen of the 140 grain cartridges the COAL looks like using the .30-30 magazine would be a fantasy. So i find myself wondering if the 6.5 BRM case could be loaded with lighter bullets (90-100 grain) to get a COAL to work in the factory magazine, and a 24 inch barrel with a 1:10(?) twist, and still be a solid boar/deer/paper rifle?

seeing as the BRM drives a 140 grain pill at 2500 fps, would it be reasonable to think the lighter bullets would be in the 2700-2800 fps range? would that be fast enough to make the lighter bullets effective killers at .30-30 range?

(Ill be building a 6.5x55 later so giving up the big pills (130-160 grains) in the 340 isnt anything I'll loose sleep over.)