Underwood .45 ACP 200gr +P Bonded JHP in Vyse Ballistics Gel. - 1911Forum
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  #1  
Old 05-11-2020, 03:35 PM
5pins 5pins is offline
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Underwood .45 ACP 200gr +P Bonded JHP in Vyse Ballistics Gel.



Test Gun: Colt 1911 Government, Defender.
Barrel length: 5 and 3 inches.
Ammunition: Underwood .45 ACP 200gr +P Bonded JHP.
Test media: 10% Vyse Ballistics Gel, Clear Ballistics Gel.
Distance: 10 feet.
Chronograph: Caldwell Ballistic Precision Chronograph G2.
Five shot velocity average: 1069fps
BB Calibration: 4.0 inches.

https://general-cartridge.com/2020/0...allistics-gel/
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  #2  
Old 05-11-2020, 10:00 PM
tjpaxton tjpaxton is offline
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Awesome, keep the tests coming.
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Old 05-12-2020, 08:35 AM
david_root2000 david_root2000 is offline
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Thank you. Gives me more confidence in my 3.5" LW ACP.

David
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  #4  
Old 05-12-2020, 10:25 AM
sawman556 sawman556 is offline
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Underwood makes good ammo. Hot!
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Old 05-13-2020, 06:46 AM
SuperMan SuperMan is offline
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Thanks as always.... This is some of the best performing .45 ACP ammo I have ever seen...

Bob
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  #6  
Old 05-13-2020, 08:23 AM
KCJeep KCJeep is offline
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Another awesome write up. Underwood quality and performance is absolutely top notch. They are the first place I look for carry ammo.

I wish they had more standard pressure offerings in .45 acp, I am reluctant to put an Underwood +p load in my alloy framed guns.
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Old 05-13-2020, 02:30 PM
sawman556 sawman556 is offline
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Quote:
Originally Posted by KCJeep View Post

I wish they had more standard pressure offerings in .45 acp, I am reluctant to put an Underwood +p load in my alloy framed guns.
I wish that too.
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  #8  
Old 05-14-2020, 11:25 AM
Nitro.45 Nitro.45 is offline
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Good lord, looks like an HST!
Don't be shootin' that out of a plastic gun either!
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  #9  
Old 05-14-2020, 04:06 PM
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Rifter Rifter is offline
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Quote:
Originally Posted by david_root2000 View Post
Thank you. Gives me more confidence in my 3.5" LW ACP.

David
Why? Plenty of tests have been done that show that standard 230 gr. ball loses less energy (read velocity) in short barrels than lighter, faster loads in terms of what makes it to the target. You also lose momentum and penetration with lighter bullet loads.

The box rates this load at 1100 fps. You aren't going to get that out of a 3.5" barrel. Most of the lighter bullet loads sold for short barrel guns attempt to compensate by boosting speed, but all that does is push the recoil levels up to painful levels.

I did some playing with lighter bullets a few years ago when I got a box of 185 gr. XTP HP in a trade. I normally don't shoot anything under 230 gr. but I figured I'd do some testing and use those to do it. I was using a Ruger SR1911 5" for this. I carefully worked up to the point of pushing those 185 bullets to just shy of 1200 fps before I got cold feet. Recoil, even in that full size steel SR, was absolutely brutal. Accuracy was great, and seemed to get better the hotter the load was, but obviously pressure was high to get to that level. But that's what you have to do to make the light bullet loads useable.

Its a double edged blade though. To get the energy, you beef up the velocity. If you make the bullet tough enough to hold together at those speeds then it doesn't expand well. If you use a bullet that expands better, then it can't handle barrier penetration at those velocities. All of this is old news however, and most of the tests have revealed that.

Not trying to rain on your parade here, just saying I think you'd be better off using standard 230 gr. ball in that short barrel piece. You lose less velocity overall, and less momentum with the 230 and any of the lighter bullets. You also don't have to worry about using +P loads in that alloy frame gun.
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