Winchester markets a large pistol primer that they state to be suitable for both standard and magnum loads. I've used them for years. As long as you stay away from max loads you can likely get away with magnum primers in standard loads.
Many powders can react dramatically different with what may seem like small likely insignificant changes. For me, it just ain't worth "F' ing" up me or my weapons to save spending $20.00 for the right primers.
Ok thanks