[BsChoy]

I read the 243 thread that was just started about powders and didn't want to hijack. I know alot of people recommend using magnum primers in rounds with ball powder that have larger capacities.

My question is, does the 243's average load out of a nice medium to slow Ball powder (like 40-48 grains) REQUIRE mag primers for consistant ignition and acceptable ES/SD numbers?

[NCsmitty]

Some of the older ball powders that have been made for 20-30years or longer, seem to benefit from magnum primers and are usually recommended in the load data.
The newer ball powders like Accurate Arms/ Ramshot produces, seem to do fine with the standard primers in the recommendations, except in the large magnum cases.
With you living in NY, winters can be pretty cold and a magnum primer in the work up will give you better, more consistent ignition in cold weather.


NCsmitty

[Galil5.56]

For me it's absolutely mandatory if I want top accuracy w/o fliers. I use CCI 250's in every temp and every bullet weight using H414/WW760 in .243 Win. Use 250's in 06 as well with this propellant too.

[BsChoy]

Since no one has any large rifle mag primers in stock since powder valley sold out of the Wolf primers I will happily stick with extruded powders. Thank you for the responses fellas.