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I've done a LOT of chronographing with those primers, and very seldom see much difference between them. I've used a lot of WW296/H110 and those primers are quite good for SD.
What bullet are you using? A cast usually doesn't work all that well with the Lee die, but jacketed does OK. If you do a bunch of cast, ya might turn a couple thou off the expander pin. That'll increase the tension on the seated bullet.
Increasing the roll-crimp won't hurt, too.
Have fun,
Gene
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