I'd say it depends upon the bullet, but in general I do not believe there is a downside to using the heaviest bullet in a carbine. That is exactly my strategy with my .40S&W. I use 180 gr FMJ for practice and 180 gr JHP otherwise. The added velocity of the 16" carbine, while beneficial, should not be enough to introduce bullet destruction in ballistic gel where it did not occur with a 4" barrel. However, if there are ballistics tests that show otherwise, please show them. I'm smart enough to know when to change my strategy in the face of 'unfortunate truths'.What prompted my question is that I read; unless you're using a bonded bullet, 147 should be used in a carbine. The added speed gained from the carbine barrel exceeds the lighter 115 & 124 bullet's specs and they will most likely shed their jackets and come apart instead of expanding. The 147 is traveling slower and it tends to hold together better & penetrate farther.
You're turning this into an expensive thread for me. I'm going to have to order some 124, 135, and 147 to try things out.It's the lighter, faster projectiles that are said to have a problem, NOT the 147s.
No 'proof' was offered to back up the claim...
I have not noticed any problems with the 115 & 124 gr. ammo I have fired, and I just ordered some 135 gr to try out.
I've been involved with quite a bit of terminal ballistics testing on a professional level. Velocity differences of even 100 fps can certainly negatively impact performance with some pistol bullets, regardless of bullet weight. It's why some police departments adopted different rounds for duty use in their 9mm carbines and SMG's. Newer designs, especially bonded bullets, will be less likely to exhibit that issue.I have fired Winchester ranger t, Gold Dot G2, HST, Hi Shok, Hydro Shock, and Berry's plated all in 147gr, and I have had no issues with them. I pretty much only shoot 147 grain out of all my 9mm. I don't think the difference in velocity from the carbine will be a negative issue with terminal ballistics.
While the HST is a very good bullet for it's intended purpose, it was designed to operate at pistol velocities. Increase, or decrease, that velocity too much, and performance can suffer. The 147 grain version will not have the same velocity gain out of a 16" barrel as the 124 grain +P version, so the performance may not be affected as much. It all depends on the construction of the bullet. Some bullets have very narrow velocity windows.https://blog.hsoi.com/2014/11/22/federal-hst-ammo-tests/
I found this test interesting... while the pickup in velocity for 124gr and 124gr +P was much more than the gains for 147gr, the terminal performance seemed to indicate that the 124gr variety would have issues with expansion and fragmentation, as they shed petals. The 147gr remained intact. While I'm interested in the velocity gains for 124gr and getting up to near .357 power, maybe it does lose something terminally. However, this is a single test, and the load also shed petals being shot from a G19. Maybe he had a bad lot or run of 124gr ammo, as I would not expect this to happen out of a 4" barrel. Thoughts?
Sorry for resurrecting an old thread.