Substituting SR for SP primers ?

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I had to know so I tried

Uusing my current .357 mag load utilizing 125 gr. bullets and SP primers I loaded 86 rounds using the last of two partial boxes of SR primers (Remington and Winch.) with no change in my powder charge and headed to the range this morning.

Using my unaltered 4" Ruger GP-100 and shooting at the 25 yd. 8" gong 80 rounds fired as they should and grouped every bit as good as my pet load using SP primers and 6 rounds would not fire the first or the second time.......even though 80 rounds fired out of the 86 I did noticed that all the primer hits looked light.
 

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