Today I was doing some load development. 303, 160gn cast using 26,27 and 28gn of 2208. And, 243 106gn cast with 24 and 25gn of 2208. Both using win lr primers. All around groups weren't too bad but I got some unburnt powder in the 303 but none in the 243. Neck of casings are quite clean. I've used 28gn of 2208 with 180 and 210gn cast boolits with success and no unburnt powder. Any ideas why. thanks
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