Tryed imr4320 today with ar15 mil spec chamber 1/7 twist. Cast bullet rcbs 22/55 sp.oal 1.260.I started with 20grns and at 100 yrds the picture shows the results, did very well was concerned with fast twist rate. Lube 50/50 beeswax and alox 350. No leading after 50 rounds, all chambered and ejected perfect. So thats all i got.
powder charge
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- Last Post 08 April 2015
heet
posted this
07 April 2015
Also i could not chrono, these were wheel weights water quenched probably 15brn.
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Wineman
posted this
08 April 2015
Great group. Kind of a forgotten powder. Everyone who uses it always seems to really love it. My only experience is that in the M1 Garand with Jacketed, nothing slower than IMR 4320 was part of the ritual advice.
Dave
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