help 357 small pistol or small rifle primers

The short answer is you can use either, so long as you work your loads up from the starting load and recognize that your top end may well be lower than the max powder charge when using rifle primers.

Unless you are using heavy bullets and very slow powders, you will be perfectly fine with standard pistol primers. If you are using the slower primers, you might want the magnum pistol, or rifle primers for proper ignition.
 
Is this for .357 in a rifle or a pistol? You MAY have weak hammer strike problems with small rifle primers in a pistol, because the rifle primers MAY be harder. Hardness sometimes depends on the brand of primers.
 
I'd advocate against the use of magnum primers except with magnum powders (H4227 and H110 come to my mind, but there are others). Using magnum primers may cause a pressure spike by igniting the powder too quickly.

If you plan to shoot lead, you'll probably end up using a light load of fast burning powder, I'd say small pistol is the way to go.
 
primers

I use Fed small pistol magnum and in the winter switch to small rifle, then again it gets pretty cold up this way.
 
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