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Posted: 8/24/2013 1:45:08 AM EDT
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To the range today to test 5.56 loads of IMR 4198,
not choice powder for an AR, but with 55gr projos and carbine length gas system should cycle OK. Start charge 20grs, 0.2 grain steps up to 21 grs. Depending on manual, high charge is in max load zone but OK in 5.56 chamber. Also get to work out my second love, SA M1A. Should be a great day, will file range report later tonight or early tomorrow. |
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Everything good at range, mild temp for AL in August,
no wind, partially cloudy. All loads of IMR 4198 cycled perfectly, recoil was less than Fed xm193 for all charges. Of the six loads tested, (5 rounds each @ .2 gr steps from 20.0-21.0), the 21 gr loads grouped best at 1". Absolutely no over pressure signs, all loads had rounded edges on spent primers, no flattening or back out. Don't have chrono so no velocity data. IMR 4198 seems OK in carbine length gas systems, plan to enjoy the 4 lbs of it I have. |
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