Originally Posted by
1168
There’s also one (fairly thorough) internet article suggesting that some of what we think of as powder temp sensitivity might actually be primer temp sensitivity.
Word Up! Primers can completely change the pressure curve of a load with all things else held constant. I really have never had luck with the ladder test stuff.
If I were... (and I usually have to be)... worried about temp swings, I'd work a load that had 100-200 FPS upside cushion from a 5.56 load with crimped primers. For example, when I used to shoot W748 and 55 gr fmj. I'd shoot for 3100 fps out of a 20" gun to leave me some margin for error/hotter temps.
"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
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