This is a retype after losing the original web page. I
did not put in the individual comments. Note the spreads. The Rem's
had some very wild shots high and low. CCI BR2 and the Fed 's were the
most even of the common ones. The new Russian
were very even, but this was a limited lot and they are not widely
Weighing Primers: I did some test
weighing and found the bench rest had virtually no variations. Of the
others, there WAS a relation between weight and power. Those extra
heavy tended to be stronger, and light were weaker.
Firing pin strength also seems to be a definite
factor. Stronger hit is probably more consistent. This has been noted
by some sharps shooters when they break a firing pin. It will still
fire, but they get fliers and open groups.
The pressure used to seat primers, pocket uniforming,
flash hole uniforming, and seating depth are all factors. Keep them all
Another thing that is not in this test, but I have
noted, is using a newsprint wad over the primer. This keeps grains of
powder out of the flash hole. It seems to even out the ignition by
eliminating a variable (sometimes with grains in and sometimes without
grains in, or a variety of combinations).
Here was the most informative set of explanations and primer comparisons that I have found.
I try to stick with Winchester 209’s myself. But for me it’s more about taking as many variables as possible out of the shells to allow me to focus on my own inconsistencies.