power factor ?????? - MP-Pistol Forum

power factor ??????

This is a discussion on power factor ?????? within the MP Reloading forums, part of the Smith & Wesson MP Forum category; I'm reloading with a 9mm jacketed Round nose 124gr (berrys bullet) and 4.0gr of Tight group powder, anyone know a ball park number on power ...


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Old September 8th, 2015, 08:05 AM   #1
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power factor ??????

I'm reloading with a 9mm jacketed Round nose 124gr (berrys bullet) and 4.0gr of Tight group powder, anyone know a ball park number on power factor?

Much Thanks! Monty
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Old September 8th, 2015, 08:37 AM   #2
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We would need to know the velocity to work it out.

JBM - Calculations - Power Factor
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Old September 8th, 2015, 11:49 AM   #3
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I don't know, I don't have access to a chrono
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Old September 8th, 2015, 02:21 PM   #4
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I have added my link to complicate things...
http://elevenbravo.net/ballistics/calculator.htm

If you dont know the speed, you will never know the power factor, ft/lbs, etc.. etc..

Heres mine... No reloader should reload without one, its like shopping naked at WalMart, not that its a bad thing... :-)

ProChrono Digital - Competition Electronics


You can see it in action here:
https://www.youtube.com/watch?v=3NjxFTpZOVY

I have *NEVER* had a problem with it, glad I did the research before I bough!

EB
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Old September 8th, 2015, 02:24 PM   #5
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PS: Berrys does not make a jacketed bullet (AFAIK), they are plated...

But fear now, there still damn good bullets! I load my plated to the same specs at true FMJ/TMJ and do not have any problems at all... This is my experience, experiment on your own.

EB
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Old September 8th, 2015, 03:13 PM   #6
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It's been a long while but I used to load 124gr jacketed with 4gr titegroup. If i remember correctly it was running around 1120 fps give or take 50 fps.
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Old September 8th, 2015, 04:25 PM   #7
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Good speed...

Power Factor 138.88 (respectable minor)
Kinetik Energy (ft-lbs) 345
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Old September 8th, 2015, 04:53 PM   #8
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A 124 gr LCN with 4.0 gr of Titegroup gave me 1117 FPS out of a 5" 1911.

Assuming the Berry plated bullets behave similarly (they should) and your barrel length is similar, that's a power factor of 138.5 so you should be in thatballpark too.
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Old September 9th, 2015, 10:53 AM   #9
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Thanks for the replies, I sent 20 rounds home with a buddy from the IDPA match last night. He is going to chrono them for me and I'll come back with the results
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Old September 9th, 2015, 10:54 AM   #10
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Quote:
Originally Posted by Smith Shooter View Post
A 124 gr LCN with 4.0 gr of Titegroup gave me 1117 FPS out of a 5" 1911.

Assuming the Berry plated bullets behave similarly (they should) and your barrel length is similar, that's a power factor of 138.5 so you should be in thatballpark too.

They are plated round nose, sorry for the confusion....
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Old September 9th, 2015, 10:56 AM   #11
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Quote:
Originally Posted by Smith Shooter View Post
A 124 gr LCN with 4.0 gr of Titegroup gave me 1117 FPS out of a 5" 1911.

Assuming the Berry plated bullets behave similarly (they should) and your barrel length is similar, that's a power factor of 138.5 so you should be in thatballpark too.
Thanks! this is the ball park figure I was looking for, I shoot a 5" M&P pro with a storm lake 9mm conversion barrel
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Old September 9th, 2015, 05:27 PM   #12
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Quote:
Originally Posted by Montybrown View Post
Thanks! this is the ball park figure I was looking for, I shoot a 5" M&P pro with a storm lake 9mm conversion barrel
We didnt know that, then everything we just said is out the window!















JUST KIDDING!

Let us know how it works out for ya! Its so rewarding to load a GOOD round on your own and hit the targets over and over!!

EB
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Old September 9th, 2015, 07:26 PM   #13
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Quote:
Originally Posted by Montybrown View Post
Thanks for the replies, I sent 20 rounds home with a buddy from the IDPA match last night. He is going to chrono them for me and I'll come back with the results
While that might give you a ballpark idea, the velocity out of your pistol is what is important. Not out of a pistol like yours, your pistol.
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Old September 10th, 2015, 05:50 AM   #14
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Ran them through a Chrono--1060fps,deviation across 10 rounds was 6fps
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Old September 10th, 2015, 02:03 PM   #15
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6fps variance is OUTSTANDING! I usually get around 20-30+/-... but, its a non issue.

If your buddy has the same length barrel, the velocity is close enough to be good to go.

Another words, the difference in velocity between two different weapons with the same length barrel is Inconsequential .

EB
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