9mm vs .10 vs .38 bullet weight [Archive] - Glock Talk


View Full Version : 9mm vs .10 vs .38 bullet weight

07-02-2011, 10:07
Hi Mas,

For these guns does a lighter weight bullet have less recoil or more recoil when fired from the same gun?

442 158gr vs 125gr
G20 180gr vs 165gr
G17 147gr vs 115gr

Mas Ayoob
07-02-2011, 12:58
Rule of thumb is heavier bullet will have more recoil if loaded to equivalent pressure to lighter bullet. That's not the case necessarily in your comparisons below, as the loads mentioned aren't always loaded to equivalent pressures.

442: 158 grain +P will kick more than 125 grain +P .38 Special in my experience.

.40 and 10mm: 165 grain subsonic feels milder than 180 grain subsonic, but a hot 165 grain (say, 1140 foot-seconds) will be palpably snappier than 180 subsonic. In the 10mm you ask about, however, it's gonna depend on the load. A lot of the 180 I've seen has been subsonic, essentially equivalent to the .40 S&W, while the factory 165 grain I've shot has been at 1300 foot-seconds and had considerably more recoil. I don't recall ever shooting full-power 180 and 165 grain side by side, so can't help you there, but the 10mm forum here at GT has lots of collective experience with the caliber; I'd suggest you pose this question there.

G17: Some find the 147 grain 9mm subsonic kicks less than standard pressure 115 grain, though I personally can't tell the difference. +P or +P+ 115 grain will be a bit snappier than 147 subsonic.


07-02-2011, 13:34
Thanks Mas for the qUick response.