Sean Harper
I used 1680 - 28.0gr and a 30 cal cast bullet to build
Wednesday, June 10, 2026, 11:24

pressure , even a 30 cal 100gr jacketed ( anything cheap) shot down the 35 bore will build enough pressure to blow out the shoulder.
I have a lot of Surplus 1680, so I always use 1680 on Gary's 30-30 based cartridges 7,30,8mm,.35 .

Sean


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