Primers for 357 magnum

[Obturation]

I use mag primers with h110, I prefer mag primers always for every load regardless of powder but if I run low on mag primers (like now) I know I can safely use standards with no risk . I've never seen any difference, you'll get more variation between powder lots than primers will give you.

 

[Mr. Zorg]

Speer's online 357 reloading data recipes use small pistol magnum primers with some powders, small pistol primers with other powders.

https://www.speer.com/reloading/handgun-data.html

Remington warns against using their 1.5 small pistol primers in 357 Magnum cartridges regardless of powder used.

"Special Note:

• These primers are NOT recommended for loading high pressure loads such as 357 Mag, 357 Sig or 40 S&W. Please consult a Reputable Loading Manual for loading data."

and instead recommend using their 5.5 small pistol primers for 357 Magnum cartridges regardless of powder used

 

[bullseye308]

I have loaded thousands of 357 with CCI 500 primers, at least 12# of Bullseye and 1# of 2400 and have had no problems. I have never bought a magnum primer.