Two diameter GG bullets

[bruce moulds]

Richard,
the nasa bullet design will give you more powder capacity, but comes with problems.
first is the creedmoor nose design which carries more drag than optimium.
replacing this with a money or elliptical will solve that problem.
the other issue is the long bore riding, bore diameter nose.
it will bump into the rifling just like a pp bullet does, but lacks the protection of a patch.
guess what this means when you are not blowtubing or the barrel is clean?
putting micro mini grooves on the bore ride section will stop the leading, and barely increase the drag.
off to a custom mould maker for you.
keep safe,
bruce.