Sierra's 70 grain blitzking with the plastic tips removed will cycle through the magazine of my 25-20 with acceptable COAL. Removing tips of the blitzkings is a PITA, but they give good speed and terminal performance.
75 grn Speer's or the Rem 86grn round nose should be available on gunbroker, but they aren't just everywhere, or available any time of year.
Neat project, good luck with it.
my marlin 62 LOVES the 70 grain blitzkings, and it pops them out quite nicely. I think it would be a great little load for kids to learn on and could harvest a deer easy enough. a 70 gr bullet moving almost 2600 fps is no slouch. my 6 year old loves shooting it too. I wasn't impressed with the 86 grain bullets, 75's are fine, I have some but haven't played with them too much.
