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Old 07-17-2014, 17:33   #1
brokenprism
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one five five?

Before the old timers tell me to search, I know; I could. But people come on here all the time who don't know how, why, or where. I've been one of them. So let's do it again, as if we haven't asked every possible question about grips, magazines, springs, platforms, etc., because we have, and we do it anyway.

As a long-time .45 fan, I've been a heavy-for-caliber guy, regardless of caliber, for many years. Recently I've been looking at the 155 gr in .40. A USP 40. 155 gr, as the almost-lightest-possible, is almost as heavy as the 158 gr .357, which was considered heavy for that caliber in that round.

My question is, does anyone swear by the 155 gr in .40, not just for terminal ballistics, which are impressive, but also for point of impact...? Am I going to have to aim up or down...? I like 180 in winter, and want to rely on 155 in summer. 165 seems the perfect compromise, but compromises usually do nothing well. They only expand so much in any weight, but energy is a meaningful number.
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Old 07-17-2014, 20:30   #2
Adamz04
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165gr has always been my favorite in .40
It's heavy enough for year round carry but also fast enough to perform well. Before I started carrying my g33 I carried 165gr HST.
I've always felt personally 180gr was a little heavy for .40 and was more suited to 10mm, but then again that is only an opinion. I would prefer to carry 155gr in .40 over 180gr.
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Old 07-17-2014, 20:58   #3
fredj338
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Depending on the gun, 155gr could shoot lower poi. My house gun is 40, I like 165gr GDHP. IMO, switching from one wt to another for winter, just no point. Proper jhp design works, Summer or winter clothing. Stick to one, keeps things simple.
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Old 07-19-2014, 02:14   #4
ABNAK
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The 155gr JHP at ~ 1200fps is where the .40 made a name for itself IMHO. The 180 started the round moving but the 155, snappy though it is, earned the .40 a good rep in the early to mid 90's.

The vaunted Remington 155gr loaded especially for the USBP at 1250fps was perhaps the pinnacle of that weight. Of course it was HOT and wore guns out a good deal quicker than more mundane loadings.
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Old 07-19-2014, 09:00   #5
Jim Watson
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Oh, I thought you were talking about a howitzer.
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Old 07-23-2014, 08:58   #6
Dave T
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Quote:
Originally Posted by brokenprism View Post
...but energy is a meaningful number.
Actually, it isn't. The capability of a cartridge/load/bullet in putting an end to hostilities is more dependent on momentum than on energy. Heavy bullets produce more momentum and consequently tend to be better stoppers.

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Old 07-23-2014, 11:59   #7
fredj338
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Quote:
Originally Posted by Dave T View Post
Actually, it isn't. The capability of a cartridge/load/bullet in putting an end to hostilities is more dependent on momentum than on energy. Heavy bullets produce more momentum and consequently tend to be better stoppers.

Dave
No, it's more dependent on the bullet design. FMJ & JHP @ the same vel have the same energy. The JHP, at least in a SD scenario, will always have better effect, energy be damned. Momentum is only important as to penetration. You only need enough to reach desired penetration, which again is bullet design specific. A 115gr FMJ in 9mm is likely to penetrate further than a well designed 147grJHP. The 147gr will likely have more momentum.
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Old 07-23-2014, 12:13   #8
fastbolt
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Hey, if you like the 155gr .40 loads, it's your gun.

It's shown over the years that it can be harder on both shooters and guns.

At the moment, it seems the lighter bullet weight .40 S&W loads have about run their course for major LE/Gov contract appeal, and the last 135gr load specified for one major gov bid was actually a reduced velocity load for its light weight (1200fps, with an allowable +/- 40 fps).

The 180gr load seems to have been making a noticeable "return" across the board for actual LE/Gov sales.

POA/POI is something you're going to have to determine for your gun, for whatever ammo you're using, and for you.
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Old 07-23-2014, 13:17   #9
G26S239
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I like 155s. I have 100 rounds of 155 Gold Dots and about 400 rounds of the Winchester 155 grain JHPs and about 80 rounds of the 155 grain Silvertips in my stash. I also have almost 400 rounds of 180 grain HSTs. I would feel comfortable using any of these.
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