165 gr Speer GDHP bullet vice 165 TMJ bullet
Originally Posted by smlake
Would/could the primer brand difference account for that much difference in the powder load? I would appreciate any ideas. Thanks in advance.
HUGE difference in bullets here that you must understand; a HP vice a TMJ is very different. if you take all that weight out of the nose of the bullet, it has to go somewhere, so it goes to the base. Compare it to a FMJ or TMJ that is of the same weight; you will find that in most cases CASE VOLUME is different
when seated to the same OAL. You can never assume that is it ok to interchange data between bullet types. You must compare apples to apples; this is like a apples to cannon ball situation.
Win primers - I do find to be a slight bit hotter and get better powder burn from slower burning powders.
Testing barrel lengths and temps can vary between manufacturers also.
I'll always tend to start off at the min load between those that differ and work my way up until I find my sweet spot load.
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