Take the .06, but stuff it with 180gr Partitions and H4350 powder. A Game King at 30 yards out of an .06,might not give you the desired results/. As for the pre 64 being a might heavier, I am 76 and I still tote mine around at 10,000-11,000 feet. Surely a young marine won't have of much problem.
When you get down to the serious stuff, it doesn't make much difference what the head stamp on the cartridge is as long as you can hit what you aim at and select the appropriate bullet. Elk are not hard to kill.Those that claim they can soak up a lot of lead, more than liklely, are putting the lead in the wrong place.
