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Small rifle primers have thicker cups to take the higher pressures and more mix to ignite the larger powder charges than small pistol primers.
You can use small rifle primers in pistol cartridges if you redevelop the loads from a reduced starting charge. There will be some risk of misfires if you have a reduced power mainspring or other source of marginal ignition.
I have found that a small rifle standard primer will give higher velocity than a small pistol standard but less than a small pistol magnum.
Federal used to recommend small rifle primers in .357 magnum before they made a magnum pistol primer.
Use of small rifle primers is common to disguise signs of overload in .38 Super raceguns.
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