I know of no other ammo available in the USA in 30 Luger but the Winchester and Fiocchi. Their power factors/velocities are well within range of error for either brand.
I feel that the modern 30 Luger ammo is down loaded somewhat to be sure not to explode any of the antique handguns using it.....like they do for 45 Long Colt ammo here in the USA. I have no way of knowing what the original muzzle velocities and power factors actually were out of a 4 in bbl, and the chamber pressures that they produced.
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