So uhh... Can't wait to see the +P versions :evil:
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.
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?
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.
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...
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.
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.
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.
January 21, 2005, 01:46 PM
Black snowman has it right. Max pressure is not as important as sustained pressure.
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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