The fine print on the Rem. 1 1/2 (and 6 1/2 SR) boxes says NOT for High Pressure loads, such as .357Mag, .357 Sig, or .40 S&W loads.
Trust me, it is in VERY small print!!.
Most all other Small Pistol primers will work for your .357 loads. Use Small Pistol Mag. primers on WW-296/H-110, and some other slow burning magnum powders.
I have+do load some .357 Magnum loads with Small Rifle primers. They work fine as long as you have enough hammer spring pressure.
You may try to trade your Rem. 1 1/2's for some other Small Pistol primers. CCI-500, Winchester SP work for most loads...Bill.
the 1 1/2 primers would be fine with light lead loads in a 357 and thats about it. the primer is designed for small non magnum handgun loads.
this is what Remmy says using this primer.
Special Note: These primers are NOT recommended for loading high pressure loads such as 357 Mag, 357 Sig or 40 S&W. Please conslut a Reputable Loading Manual for loading data
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you would be better served using small magnum pistol primers.
What kind of powder you using? I talked to an Alliant rep today about 2400, he said to use small pistol, but not magnum small pistol. If you want to be 100%, call the powder manufacture. Just my honest opinion...