Northridge
Gold $$ Contributor

Does primer choice matter? its a question that comes up from time to time and my answer is "yes" always "yes" and here is a example that represents well. both powder ladders where identical except primer used, both ladders shot at 800 yards same shooting session same gun. top ladder was a cci BR-4 powder ladder that has been duplicated several times so the base line is set and planform clearly likes cci BR-4's but as I was narrowing my tune adjustments I thought I would throw another primer at it as a comparison and that was the lower target with cci 450 primers. a note for me is two fold usually my tuning formula does not have BR-4 winning out over other options but here they did. clearly as you study the second target the cci 450 primer was really kind of punch drunk and was having trouble with color affinity. velocity region was identical and SD was even similar but one primer type chooses to win out in a big way really. the point is this, I guess if a primer over a broad range is not developing small color affinity you have to try another type. it can make a record setting platform just average or worse if using the wrong primer for the job. Try not to get stuck in a rut either as a primer that wins this time may loose when you re-barrel for another season & have a fresh keg of powder and fresh brass.
colors as shot low charge to high charge both targets :
orange-lowest
black-b
blue-bl
red
green-highest
Shawn Williams

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