Stop drilling out flash holes and there is no need for Magnum primers you are not tried to ignite coal, If standard primers will ignite 46.00 grains of 2206H why won't they
work with Trail Boss that is even easier to ignite,
Give your barrel a good clean any copper in there will cause lead fouling, the 11" twist will stabilise the 200 Grain but try the 151HP that works in any .30 cal.
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