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It is relatively easy to crank up the pressure in a load to well over the acceptable and safe prescribed pressure with just a primer swap. From a reloader’s point of view, this is the least desirable change. Tests indicate that some common target loads can change by as much as 3,500 psi with only a change of primer.

Here is a minor example from the 10-gauge tables of changing results from simply changing a primer. A quick search through the load data in this book will give you many more such examples. Let us hypothesize that you are using a single stage press to load 1-5/8-ounce lead shells and you have Blue Dot powder and Remington SP10 wads on hand.

Using a CCI 209M primer, the recipe calls for 45-grains of Blue Dot for an achievable velocity of 1,285 fps and a maximum chamber pressure of 8,000 psi.

Using a Winchester 209 primer, with the same 45-grain Blue Dot powder load gives you the same shot velocity – 1,285 fps – but raises the pressure in the chamber by 10 percent to 8,800 psi.