Luke, only your particular rig can tell you where the limits are. And the only way to find out, particularly when you are approaching the maximum recommended load, is to creep up on it, about .1 or .2 grains at a time. At the first sign of pressure, you back off a couple of tenths and tell yourself that you've discovered the limit for that particular loading and firearm. The only ill effects of cramming more powder into your cases is that it accelerates erosion of the throat and barrel. The larger the load, the higher the chamber pressure; the higher the chamber pressure, the more heat you create; the more heat your loads create, the faster they will erode the throat and barrel. What you need to ask yourself is: am I chasing accuracy or MV? IMHO, accuracy ALWAYS trumps MV.
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