.45Super velocity

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So, it seems like a really simple question but I've been digging for an hour and can't find any answer..

What muzzle velocity can one expect from a .45 super (in 230gr and 185gr) from an 8" barrel? I'm thinking of an H&K UMP in particular, but thats irrelevant.

Thanks.
 
From an 8" barrel?
You'll have to use whatever standard correction factors apply, because I don't know of anyone who tests with an 8" .45 acp barrel.

However, from a 5" 1911 barrel, I believe the following .45 Super velocities are accepted as standard:
185 gr--1300 FPS
200 gr--120FPS
230 gr--1100FPS

I am working from memory here, and I'm hoping that someone will come along and either validate or correct my statements. I'm a fan of the concept, and own one .45 Super 1911, but have no practical experience reloading for the caliber.

Best regards, Rich
 
I'm surprized this data isn't available... H&K even says you can fire .45 super from the UMP out of the box - I'd think someone would have tried it.

I'd be happy with my "best guess", but the variations in gain/loss of velocity with varied barrel length is really complicated especially when you're dealing with the first 10" and I have no idea
 
"http://www.realguns.com/loads/45Super.htm"

I've posted about this on a few forums, and I'm pretty sure someone on every forum has posted a link to that data, unfortunately I don't know how to get a reliable answer about muzzle velocity from the 8" barrell of an H&K from chrono data out of a 5" barrel.

Please pardon the sarcasm.
 
Well, pardon my sarcasm also, but what you do is buy/borrow a chronometer and fire some of your ammo across it. That's how you determine the muzzle velocity from a non-standard (for that ammo) barrel length with a different action.

You could add 50 fps per inch as per the old rule-of-thumb, but that's not at all accurate since you would be attempting to extrapolate data from rounds designed to be fired in a much shorter barrel and a different pistol design altogether.
 
Actual chronograph results are needed, as previous poster said.

In the meantime, wonder if anyone has a 45 Ruger Blackawk with 7 1/2 inch barrel and the convertable cylinders for 45 ACP ?

Since the Ruger is frequently used for building 500 Linebaugh revolvers, it should have no problem with 45 Super loads.

.
 
Actually I'd really like to see the same ammo out of a 3", 4", 5", and so forth with 230 grains 45 ACP. I'm interested to see how much more power I'm getting out of my 5" barrel compared to my 3.5" that I used to carry. It's amazing that just the barrel length can boost power!
 
Powder choice, and matching it to barrel length gets kind of important with snubbies, or short barrels.

You can design ammunition that gets full velocity out of a 4" barrel, and doesn't increase, regardless of barrel length.
Problem is, it requires bullets that weigh about 350 grains, or more....

It's really fun when you get the same velocity, using two different loads, out of these three different guns:

BRFCustomvs.jpg


500lever.jpg


The ammo did drop to about 900 from 950 in this gun:
SRH500cylinder.jpg


And about 80 fps, with the 'hot' 430 grains at 1350 fps.
 
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