Actually, Federal doesn't claim that XM-193 is really M-193. Very few companies claim true M-193 specs. Maybe IMI and CBC, but I haven't kept up with it. WG doesn't claim M-193 specs either, but it comes close in practice. It seems to have a close to the right pressure and curve, it has sealed bullets and primers, it 55 gr, and I chrono'd it at 3215 at about 10 ft from the muzzle out of a 20".
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