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.
Miller, I think I may be missing something here. Seems to me what you wrote can be interpreted as saying that pressures on low pressure loads INCREASE after they leave the chamber. I've never seen a pressure curve that goes in any direction other than down after leaving the chamber. I think you're trying to say that pressures on higher pressure loads using fast burning powders drop off faster than they do on lower pressure loads, especially those that use slower burning powders. But whether the lower pressure load's pressure is higher than a higher pressure load at any specific point on the curve depends on the specific loads and how much difference there is between them to start with. I think the only generalization that can be made is that lower pressure loads often show a slower loss of pressure than do higher pressure loads.
Last edited by L. Brown; 02/23/18 09:03 AM.
