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Remember "Low Pressure" loads are of benefit "ONLY" for lowering the pressure in the chamber area, no farther than about 4" from the breechface. "IF" the same shot load is propelled to the same velocity, then the pressures forward of that will actually be Higher with the low pressure load. If the MWT is down the barrel
where it should be one is not doing it a favor my shooting Low Pressure loads unless that low pressure is obtained by the use of a lighter shot charge &/or a lower velocity, which can still use a fast burning powder. Slow powders will slightly raise the pressures beyond that approximate 4" mark.