Quote:
Originally Posted by dirty & hairy
I have a shooting buddy that has a Kel-Tec PMR30 and it is a lot of fun to shoot when it doesn’t jam, especially is low light conditions. I always wanted one but something about the jamming has given me pause.
Well, they just came out with a new pistol in 5.7x28mm that is completely different. A top loader with a 20 +1 capacity and a rotary barrel. Interesting.
Opinions? How does 5.7x28mm stack up against 22WMR?
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The 5.7x28mm is somewhat more powerful in a 5" pistol than a similar .22WMR pistol, but not .22WMR in a rifle. Here are my actual chronographed average velocities (typically 10 rounds each). I separated them into two groups, the first with 40gr bullets and the second with 29-30gr bullets.
Ruger 57 5.7x28 5" barrel - FN SS197SR Hornady V-Max 40gr - 1732fps
KelTec PMR30 5" barrel - CCI MaxiMag 40gr HP - 1303fps
S&W M48-4 8-3/8" barrel - CCI MaxiMag 40gr HP - 1476fps
Ruger Single Six 9-1/2" barrel - CCI MaxiMag 40gr HP - 1634fps
KelTec CMR30 16" barrel - CCI MaxiMag 40gr HP - 1874fps
Ruger American Rimfire 22" barrel - CCI MaxiMag 40gr HP - 1969fps
Ruger 57 5.7x28 5" barrel - FN SS195LF 29gr Lead Free - 2164fps
Ruger 57 5.7x28 5" barrel - FN SS198LF 29gr Lead Free - 2175fps
KelTec CMR30 16" barrel - CCI 30gr Polymer Tip - 2259ps
Ruger American Rimfire 22" barrel - CCI 30gr Polymer Tip - 2322ps
It's readily apparent that barrel length has a huge effect on the velocities realized from the .22WMR. I have only the one Ruger pistol in 5.7x28mm but from some Googling, it looks like the FN SS197SR Hornady V-Max 40gr hits about 2164fps from a 16" barrel. So a similar increase over the .22WMR 40gr from a 16" barrel, as one would expect.