357 magnum + 2400 powder Do I need magnum primers

[zomby woof]

I want to load some 357 with 158 grain coated lead boolits. I have H110 and 2400 powder. I've been reading 2400 may be a better choice. Do I need magnum primers? If so, will my small rifle primers suffice? I have no small magnums and not sure of availability in my area. This will be a sub 500 test run. Thanks

[Love Life]

NO. I used 2400 in the 357 magnum and had no issues with igniting 2400 even down to -20 degrees with standard small pistol primers.

[LUCKYDAWG13]

no magnum primers for 2400

[jmort]

Alliant web site indicates small pistol primers for 2400, not magnum.

[PS Paul]

I've used both. I've had better accuracy with std sm pistol primers. IIRC, Alliant is adamant one NOT use mag primers with 2400. That might have been Lyman or RCBS or a different bullet mfr though. In my notes somewhere.... Seems the consensus is std is the way to go.

[zomby woof]

Thank you!!!

[Bzcraig]

I'm with the majority, no magnum primers needed. You did mean small pistol instead of small rifle right?

[clum553946]

2400 does not require mag primers & definitely do not use small rifle primers!

[robg]

no mag primers for 2400. even sierra manual now says this

[Dan Cash]

No mag primer needed with 2400. If you do use a mag primer, redevelop your load as things get hot quick.

[Lonegun1894]

I use standard small pistol primers in my .357s regardless if loading with 2400 or Unique, the two powders I use for this caliber.

[roverboy]

Yep, I've loaded 2400 for years in .357 and I used to use CCI 550 primers but now for a long time just use CCI 500 or WIN. SP, and I get good results. A lot of the older manuals say to use magnum.

[lotech]

I use standard primers with #2400 in the .357. However, I did testing several years ago using eight primers (standard and magnum) in a 6" Python with my standard load - 12 grains #2400 and an H&G #51 158 grain SWC. Granted, this is hair splitting for sure, but I got slightly better accuracy ( around 1/4" to 1/2") at 25 yards with magnum primers in all instances but one: there was about a 3/4" advantage when using Winchester standard SP over the magnum version. Five, five-shot groups were fired with every combination.

[6bg6ga]

I was under the impression that if you used a magnum primer lower the load by 1 grain.