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Old 11-19-2020, 04:22 AM
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jimbo728 jimbo728 is offline
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Originally Posted by rwsmith View Post
Sorry to keep harping on 2400, but I use a lot of it.

Do you think magnum primers might help with the ES?

I don't use magnum primers and get ok results out of my .357 with 2400 but I don't think I've clocked a spread in a LONG time.
I had wide ES results in some .357 loadings. I added a light taper crimp to the process and ES was reduced dramatically.
I do not recall if I ever paid much attention to ES in .38spl and have only roll crimped those.
As far as OAL, I too have tested to see if seating depth affected velocity. Even a small difference in OAL caused a consistent 50 fps difference in my .357 chrony tests.
Magnum primers could very well add 10-15% increase in test averages. Have read that, have to compare them when I can.
Jim
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