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Most folks use Mag primers with H110 and W296. Winchester specifically recommends mag primers with W296. Speer manual #11 & #13 does as well.
When I used W296 I used Fed mag primers. I use AA #9 now and use Winchester WLP primers for it. Those primers are considered a bit hotter than most non mag primers and Winchester says they are for standard or mag loads. They work well with AA #9, but that powder is easier to ignite than W296 or H110.
I've had best results using magnum primers anytime I load with either Winchester 296 or Hodgdon H-110 in any of the magnum pistol calibers, whether it's .357, .41 or .44.
You don't need a magnum primer just because the cartridge has 'magnum' in its name. Magnum primers burn a bit hotter for a bit longer and are for lighting hard to ignite powders and cold weather shooting.
Unless your manual says to use 'em, you don't need 'em.
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