Originally Posted by loaders_loft
depends. not a good idea for really harsh cold temps...
I've been getting nice groups (avg. 1") with my Rem. 700 in .300 WM with 73 gr. H4831sc and 190 ABLR's using Fed. 215 match primers. The bullet is set off the lands about .005" and I get between 2800 and 2850 GPS on average without any signs of pressure.
However, I find it a bit confusing that Lyman is the only manual which calls for Mag primers for the .300 WM. Hornady, Lee, etc. specify LR primers....I just loaded ten with WLR primers and will chrono both and see how they compare re velocity, SD and accuracy. I plan to hunt elk in CO in November so weather could vary from cold to warm on any given day.
Any thoughts or suggestions would be appreciated.