I recently started playing with subsonic .223 in a variety of bullet weights, from 40 gr. up to around 75 gr (using different rifles, with appropriate twists for the various bullet weights). I have been using Trailboss powder, as it fills the case to not quite 2/3 full.
Initial testing is good. I'm half thinking of punching a few milk jugs full of water to see if something like a V-Max or Nosler Ballistic tip will actually fragment at subsonic velocities. If so, this would be a much better round on small critters than any .22LR solid or HP. This also gives me the option to tailor the load specifically to my rifles, rather than check multiple makes and lots of .22 LR for one that gives optimal velocity from a given barrel.
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