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View Full Version : 40 S&W +P safe?


1MAG1KiLL
11-28-2012, 10:21 AM
i seen on the underwood ammo site that they sell a 135 gr 40 S&W +P. they claim 1500fps with that load. thats crazy fast for a 40 if you ask me. i own a USP 40 compact and was wondering if it was safe to run that beasty round.

http://www.underwoodammo.com/40sandwp135grainjacketedhollowpointboxof50.aspx

DDRH
11-28-2012, 10:24 AM
i seen on the underwood ammo site that they sell a 135 gr 40 S&W +P. they claim 1500fps with that load. thats crazy fast for a 40 if you ask me. i own a USP 40 compact and was wondering if it was safe to run that beasty round

Wow, 1st time i've seen +P for .40SW. I thought .40 was already at maximum pressure?

1MAG1KiLL
11-28-2012, 10:29 AM
Wow, 1st time i've seen +P for .40SW. I thought .40 was already at maximum pressure?

yea i thought so too. my usp owners manual says do no run any +P loads but damn, thats one hell of a round.

sarge1572
11-28-2012, 10:30 AM
you're going to have to do a little research and find out what chamber pressures the round develops, and what the pistol was designed to handle.

Also, you won't get nearly that kind of performance out of a short barrel, but you'll have an awesome flame!!!!

DDRH
11-28-2012, 10:34 AM
yea, i'd probably just stay away from that ahaha

Fishslayer
11-28-2012, 10:37 AM
Doesn't look incredibly out of line. Do they give barrel length? Pressure specs?
My guess would be that that round is messing around near max pressure. I don't think I would be re using that brass...

EDIT: Well... at least three people have used it and are still around to write the reviews... :D

DrMoebius
11-28-2012, 11:08 AM
There are no sanctioned SAAMI specs for +P 40S&W, so that's really just someone pushing the limits on their own.

40S&W at 1,500fps should really be called "10mm Short" instead of +P.

I accidentally reloaded 820 rounds of 165gr Berrys plated with 9gr of Power Pistol a few months ago. My buddy and I were guessing that it felt like ~1,250-1,300fps coming out of my 4.2" Walther PPQ and his XD-40. That was crazy power in 40S&W. More accurately, that was borderline dangerous. I cannot imagine pushing the envelope beyond that.

I had range officers at two different locations ask to see what I was shooting. People around me were a little shocked. The steel range I was at limited me to only the 50 yard targets......But, that ammo was accurate as all get-out!!!

Is the danger really worth it?

1MAG1KiLL
11-28-2012, 11:28 AM
There are no sanctioned SAAMI specs for +P 40S&W, so that's really just someone pushing the limits on their own.

40S&W at 1,500fps should really be called "10mm Short" instead of +P.

I accidentally reloaded 820 rounds of 165gr Berrys plated with 9gr of Power Pistol a few months ago. My buddy and I were guessing that it felt like ~1,250-1,300fps coming out of my 4.2" Walther PPQ and his XD-40. That was crazy power in 40S&W. More accurately, that was borderline dangerous. I cannot imagine pushing the envelope beyond that.

I had range officers at two different locations ask to see what I was shooting. People around me were a little shocked. The steel range I was at limited me to only the 50 yard targets......But, that ammo was accurate as all get-out!!!

Is the danger really worth it?

Danger nooo.... But it would be fun as hell blasting those mofos!:29:

Raider888
11-28-2012, 12:32 PM
Sounds good, but I'm not going to try this awesome +P .40S&W ammo until more research from gun makers/engineers.

Sunday
11-28-2012, 2:01 PM
+p is not needed .

Oceanbob
11-28-2012, 3:45 PM
It's gotta be HOT because I reload 135 Grain Noslers (a fantastic bullet) in my 10MM Glock; 11.4 grains of AA#5 and it just breaks about 1510 on my CRONO. This is a max load according to my Accurate Arms Book. You can really tell it's max by the very loud CRACK as it zips out to the target.

Other shooters down the line have to recomb their hair.....

684 Foot Pounds of Energy out of a 4.6 inch barrel. No smiles but the loose Glock barrel (about .008 oversize) does stretch the case out some; a full length resize works to get the case back to normal. :D

For FUN I just bought a 9 inch .40 barrel..Gonna run it and see how much faster it is. The new barrel has good chamber support as well.

Underwood is great ammo.

Here's that 9 incher; haven't shot it yet. ;)

I expect 1800 FPS from the Underwood stuff...which is 971 foot pounds; those Zombies sitting in the tall grass at 120 yards had better watch out.!!

http://i48.tinypic.com/11kjn6s.jpg

TheExiled
11-28-2012, 4:40 PM
See the thread in the ammo and reloading section about 180gr .40 loads. Lots of info about loads and pressure specs.

Me, ill keep my fingers

1MAG1KiLL
11-28-2012, 5:27 PM
It's gotta be HOT because I reload 135 Grain Noslers (a fantastic bullet) in my 10MM Glock; 11.4 grains of AA#5 and it just breaks about 1510 on my CRONO. This is a max load according to my Accurate Arms Book. You can really tell it's max by the very loud CRACK as it zips out to the target.

Other shooters down the line have to recomb their hair.....

684 Foot Pounds of Energy out of a 4.6 inch barrel. No smiles but the loose Glock barrel (about .008 oversize) does stretch the case out some; a full length resize works to get the case back to normal. :D

For FUN I just bought a 9 inch .40 barrel..Gonna run it and see how much faster it is. The new barrel has good chamber support as well.

Underwood is great ammo.

Here's that 9 incher; haven't shot it yet. ;)

I expect 1800 FPS from the Underwood stuff...which is 971 foot pounds; those Zombies sitting in the tall grass at 120 yards had better watch out.!!

http://i48.tinypic.com/11kjn6s.jpg
I'm jealous..... Thats so bad ***!

Jet Setter
11-28-2012, 10:35 PM
S&W/M&P say to stay away from that round. They say (in the manual) any .40 should never have a +p or it is deemed dangerous/unsafe. I would rather keep myself intact and stick to the safer stuff.

RoundEye
11-29-2012, 11:23 AM
WOW, I didn't think such a thing existed. I've shot 155gr. Ranger that was around 1100 FPS and I thought that stuff was pretty crazy.

I couldn't even imagine the felt recoil of a supersonic round going 1500 FPS.

I'd stay away, but that's just me.

RoundEye
11-29-2012, 11:23 AM
WOW, I didn't think such a thing existed. I've shot 155gr. Ranger that was around 1100 FPS and I thought that stuff was pretty crazy.

I couldn't even imagine the felt recoil of a supersonic round going 1500 FPS.

I'd stay away, but that's just me.

Freq18Hz
11-29-2012, 11:41 AM
This brings up an interesting question: Why are ammo manufactures making ammo that gun makers warn not to use?

I think I saw a similar thread recently somewhere about underwood ammo +p stuff in small .380's. Ruger said not to use it, Keltec didn't

It sure would be nice to know if you are going to blow up your gun/hand/face before you shoot factory ammo...

-Freq

Oceanbob
11-29-2012, 3:22 PM
WOW, I didn't think such a thing existed. I've shot 155gr. Ranger that was around 1100 FPS and I thought that stuff was pretty crazy.

I couldn't even imagine the felt recoil of a supersonic round going 1500 FPS.

I'd stay away, but that's just me.

I'll let you know; my order from Underwood (according to Quantum view) is going to arrive Dec 5.

I will Chrony some thru my new barrel.

I do know that in the Mech-Tech the 10MM round (same weight of 135 grain nosler) does 2020 FPS. :cool2:

jumbopanda
11-29-2012, 6:37 PM
Geez, that's .357 SIG velocity with a bullet 10 grains heavier. I don't think they would sell it if it was dangerous to shoot, but it's probably not great for the gun in the long run. Or they could just be exaggerating the numbers...I've heard people accuse Double Tap of doing that.