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Barry.....Years ago there was a somewhat standard rule for powders, except Ball powders called the 5-5-10. Which meant for each % increase or decrease in powder, one got the same % increase or decrease in velocity, but twice that increase or dcrease in % of pressure. However, if you decide to reduce powder, therefore reducing velocity, I would not go below a 5% reduction in powder or below 1175 ft/sec. Ball powders can get tricky as pressure decreases or increases.
When you say you want to improve your patterns, do you mean to tighter up (smaller) or try for a more even pattern? Are you using your 28 for clay birds or hunting?
Best Regards, James
When you say you want to improve your patterns, do you mean to tighter up (smaller) or try for a more even pattern? Are you using your 28 for clay birds or hunting?
Best Regards, James
