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Old August 12, 2019, 03:20 PM   #2
Unclenick
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Join Date: March 4, 2005
Location: Ohio
Posts: 21,024
H335 is canister grade WC844 which the military chose for M193 ball ammo with the 55-grain bullet. It will work, but with the newer M852A1 lead-free round they have gone to a faster powder at a higher pressure in order to reduce muzzle flash and blast in shorter barrels.

H322 is a little faster than H335. The fact is, you can go as fast as 4198 and still get good results. In between, some people like Benchmark and some like RL10X. 16" is not short enough for the powder that is fastest with a 24" barrel not also to be fastest with the 16" barrel, but the one at the slowest end will make the biggest fireball and the most muzzle blast and will require the largest charge weight.
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