Wouldn't bother me but don't see the reason. You have two powders of similar burning rate so what's the point?? Do it / don't do it...your powder dump should be identical if loading independent. I would just focus on the slightly faster 15 max load is all.
A couple decades ago a brilliant guy on benchrest.com was trying to get the 30br to compete against the 6ppc & was irritated N133 was too fast / N135 was too slow & did the mix...his grouping was similar & boiled it down to the barrel's ability.
A couple decades ago a brilliant guy on benchrest.com was trying to get the 30br to compete against the 6ppc & was irritated N133 was too fast / N135 was too slow & did the mix...his grouping was similar & boiled it down to the barrel's ability.
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