DONT EVER TRY THIS AT HOME....or anywhere else for that matter !
Read the first line. If any questions, read the first line again.
Hopefully thats enough disclaimer.
We all know that large magnum rifle primers are “hotter” than a small pistol primer. Particularly a WLRM compared to a Rem 5 1/2.
Todays test used a 308 I have built for myself. Rem 700 action, Lilja barrel.
First string: Starline brass, Rem 5 1/2 primer, 34 grains H4198, 168 MK. Average speed for four five shot groups was 2403 fps. This load is in the Hodgdon book.
Second string: Hornady brass, WLRM, 34 grains H4198, 168 MK. Average speed for four five shot groups was 2394 fps.
Slower with a magnum rifle primer than a small standard pistol primer.
Both loads shot well, neither being better. If I had shot both strings at the same target, group would have been less that 1.25 inch.
Thanks for reporting the test, Charlie--partly because it fits into my experience that primer differences tend to matter most in either very small or very large cartridges, and especially not with extruded powders. Just one question: Did you weigh the two brands of brass?
Don't know if there's a more "medium" cartridge than the .308 with 165-168 grain bullets.
