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Discussion in 'Caliber Corner' started by ABNAK, Mar 3, 2012.
Was wondering specifically about the 230gr +P HST from that length barrel.
If it helps, I have a Kahr P45 with a 3.5" barrel and got 800 - 850 fps. It has the same type of rifling as the Glock. It kicks quiet a bit out of a small gun.
You don't need to know the the velocity so much as you need to know the "floor" for HST expansion. In .45 ACP that is 725 fps. That's straight info from Federal.
Through denim into water jugs the HST 45 +p only expanded half way. Without the denim it is a full expansion out of my 3.5" Kahr.
Okay, chrono'd some of the HST +P 230gr from my XD(M) .45 I bought today. Has a 3.8" barrel, so roughly the same as the Glock 30/36.
Not too shabby. They all broke 900fps. Granted, it's a spunky round I wouldn't want to shoot all day but I do believe that it'd be more than sufficient for social encounters.
Supposedly the XD(M) has a match barrel, so maybe it's a little tighter (?) and therefore better velocities. I dunno.
Oh yeah, 900 is plenty fast enough for the HST to work properly.
Aside from Kyles Gunshop where can you get HST at? Ammotogo is out of it right now
Don't forget the Glock .45 barrels, in addition to having polygonal rifling, also have an octagonal profile, creating a slightly better gas seal. Expect a little more velocity vs. standard rifling in an identical length barrel. I've read a chrono test of the Speer Gold Dot 200 gr. +P out of a Glock 30. It chronographed at 1017 fps! That's pretty darn good considering this round is rated at 1080 fps out of a 5" barrel.
The Glock 30 and 36 3.78" barrels are long enough to generate adequate velocity in SD ammo.
Polygonal barrels add very minimal velocity increases, if any. Here is an objective comparison where the rifled barrel of the same length had higher velocity than poly: http://gunblast.com/Kahr-45s.htm