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If you want to use up your existing supply of Magnum primers you should be able to substitue them for regular primers.
The "flame" generated by magnum primers lasts a little longer than regular primers. That's why they are recomended for large charges of slow burning powders.
They probably will raise pressure in you loads a bit, so if your loads are already "hot" you might get into trouble.
I'm not real familiar with Winchester powders, but at the velocities you mentioned, your load probably is not already on the ragged edge of safty.
Good Luck...
Joe
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