[Bart B.]

One other thing I've observed.

Depending on how folks test a given load in a given rifle, any one of several recipies will be claimed as most accurate. But it may not be in reality.

I mention this after seeing a dozen or so folks shoot the same rifle and ammo for 5 shots from a bench at 100 yards and all those dozen or so 5-shot groups ranged from about 1/2 inch to almost 2 inches. Yet that same rifle and ammo tested by its owner would shoot no worse than 1/3 MOA at 100 yards.

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Note that a given recipe that someone reduces by a 1/10th grain or a few more may not be below the stated "maximum" in the firearm they use it in. Such comparisons should only be made when peak pressures are the same as verified by quality pressure measuring equipment.

Rarely, if ever, does the same conditions exist for both the referenced load's development tools and techniques and the reloader who's using it in their firearm. Component lot differences as well as the rifle barrel differences can easily make several thousand pounds difference in peak pressure levels as well as several dozen fps difference in velocity. Just because one uses the exact same powder type and charge weight, case, primer and bullet does not mean the results in their rifle will equal what the load developement rifle produced. Such reasoning is one of the great mistakes reloaders make. Another is using visible signs of pressure on the cartridge case to claim pressure levels.