Double Tap offering .45 ACP ammo


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Lennyjoe
January 19, 2005, 07:44 PM
Just got an email from the fine folks at Double Tap showing their new offering of .45 ACP ammo.

Anyone else get this or am I way behind the times?

We are now offering four different .45ACP loadings at DoubleTap! They
are llike nothing else out there and they are just under +p pressures!
Here are the external ballistics:

5" 1911:
185gr GDHP - 1225fps
200gr GDHP - 1125fps
230gr GDHP - 1010fps
230gr FMJ Match - 1010fps

G30:
185gr GDHP - 1159fps
200gr GDHP - 1067fps
230gr GDHP - 969fps
230gr FMJ Match - 971fps

Thank you everyone for making DoubleTap great!
-Mike McNett

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Double Naught Spy
January 19, 2005, 08:18 PM
Who is Double Tap? Where are they located. I guess it is fine that they offer .45 acp ammo that is loaded hot, but for how much $$$$?

Got any links and/or reviews ?

mattf7184
January 19, 2005, 09:54 PM
www.doubletapammo.com

Lennyjoe
January 20, 2005, 12:42 AM
Who is Double Tap
Sorry, for those that dont know what a 10MM feels like then they wouldnt know doubletap. :neener:

mattf7184 hooked you up. ;)

Vitamin G
January 20, 2005, 11:22 AM
We are now offering four different .45ACP loadings at DoubleTap! They
are llike nothing else out there and they are just under +p pressures!
Here are the external ballistics:

5" 1911:
185gr GDHP - 1225fps
200gr GDHP - 1125fps
230gr GDHP - 1010fps
230gr FMJ Match - 1010fps


So uhh... Can't wait to see the +P versions :evil:

stans
January 20, 2005, 01:33 PM
Those sure sound like +P velocities to me. Don't know how they can get that kind of velocity without going +P.

Black Snowman
January 20, 2005, 03:10 PM
stans - lots of testing and very good quality control. With the appropriate presure testing equipment a good handloader could probably duplicate the loads with a similar amount of testing and research. It wouldn't be a real good idea for Mr. McNett to publish how he gets those loads as it would hurt his business, but I'm confident if that he says they're within SAMMI specs for standard pressure, than that's what his equipment is telling him.

Double Naught Spy
January 20, 2005, 03:59 PM
Thanks for the link.

Given that "+P" isn't any sort of standardized category and given that velocities do seem to be in the +P range for some loads.

If the ammo isn't +P, then how are the projectiles of getting up to these speeds? Here, I am assuming we are talking about being fired from a standard .45 acp 5" barrel. So if the barrel is the same length and the slug is the same weight, other than increasing the pressure, how is the increased velocity created?

Black Snowman
January 20, 2005, 04:11 PM
SAMMI specs are for average peak pressure. You gain more velocity by having greater average pressure over the entire length of the barrel. This is why some powders are better than others in a given loading. You can easily reach peak pressures and lose velocity by not using an ideal powder for the load.

In mathmatical terms you're looking for the maximum area under the pressure curve over time for a given maximum allowed pressure. To get maximum velocity an ideal powder would immediately hit maximum pressure and stay there until the bullet has left the barrel.

Hope that explination helps.

PS: for some cailbers (9mm, 38 spl, 45 ACP and a few others) SAMMI specs for +P are 10% over normal maximum average pressure.

roo_ster
January 20, 2005, 04:38 PM
The loads look great, but my 1911 doen't like Gold Dots. Now, if he were loading Golden Sabres...

Lennyjoe
January 20, 2005, 06:38 PM
but my 1911 doen't like Gold Dots
Might be time to get that pistol to the gunsmith for a little throat work ;)

FWIW, my Kimber gobbles up Gold Dots without a hiccup.

bratch
January 20, 2005, 08:26 PM
Just ordered the variety pack of 185 GD, 200 GD, and 230 GD to see what the old Kimber likes.

grendelbane
January 20, 2005, 11:21 PM
Pressure is not the only consideration when choosing ammunition. A 230 grain bullet going over 1000fps is going to impart a high velocity to the slide. It would do this even if you had a magic powder that could reach that velocity with zero pressure.

The proper combination of mainspring, recoil spring, and small radius firing pin stop can do much to tame a beast. So can a bull barrel, or a comp.

I like my handgun bullets to be either sub or super sonic. The 230 grain sounds like a winner.

MCNETT
January 21, 2005, 01:46 PM
Black snowman has it right. Max pressure is not as important as sustained pressure.
-Mike

stans
January 22, 2005, 11:05 AM
High sustained pressure will put more stress on the gun and brass. Usually, by the time a semi-auto firearm unlocks, the pressure has already peaked and is well in to the declining side of the curve. Change powders to sustain peak pressure and the firearm may be unlocking while the pressure is still near peak. This would have the effect of increasing the slide velocity and the higher pressure at the time of unlocking could bulge or possibly blow out the case head. Now I am sure that the ammo has been tested, but in an older firearm such as grandpa's 1911 military service trophy, it might not be such a wise ammo choice.

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