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1. preventec47

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Location:
Atlanta, GA
I was flipping through my old files and came upon this
with Accurate Arms load data. I love how it is easy to
associate performance and pressures with bullet weight and burn rate of their powders

Once again I copied this from the internet many years
ago and had to invert the colors to see and print well.

Also see how they have different loads for
JHP vs XTP bullets. I'd like to understand that better.
I wonder what the JHP bullet was ?

2. 10 fan10 fan

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Lake McClure,CA
Not being a reloader it's hard to understand why the pressure doesn't move up and down with the velocity. Also could someone tell me how to calculate energy,thanks in advance. Happy Easter

3. glock20c10mm

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Happy Easter to All!

Kinetic Energy =

Velocity (in fps) x Velocity (in fps) / 450400 x bullet weight in grains

For Example we'll use a 155gr bullet at 1400 feet/second;

1400 x 1400 = 1,960,000

1,960,000 / 450,400 = 4.3516873

4.3516873 x 155 = 674.51153 ft-lbs

So basically 675 ft-lbs for a 155gr bullet at 1400fps.

4. 10 fan10 fan

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Thanks, I have been wanting to find the best woods load but didn't know how to tell the difference between 200gr at 1160 or 220gr at 1140fps etc. etc.

5. Any Cal.

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Oct 27, 2008
The problem is that energy isn't going to help you much on that one. Since energy increases with the square of velocity, the best energy will always come from a light bullet going fast. I believe a 22-.250 has higher energy figures than a 45-70, but which would you want if you were faced with a big animal?

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Pretty sure the 150 JHP was a Nosler and the 155 was a Hornady since that is what is currently published.

7. WeeWilly

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You can plug the above formula in your calculator (my HP calcualtor has the constant 450,400 in register 1), or if you are near a PC, just do a google search on the term "muzzle energy calulator" and use the one that appeals to you.

8. WeeWilly

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While I agree with where you were going, I am not sure about the 22-250 versus 45-70 ME example, as I think in just about any load the 45-70 will be making more ME.

Within a given caliber the lighter bullet will generally produce more muzzle energy at max pressure, but may not be the bullet weight you need for penetration.

Last edited: Apr 9, 2012
9. glock20c10mm

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In addition to what others have mentioned...

Are both the bullet weights hard cast lead that you're comparing?

If so, and there is nothing larger than Black Bear for you to potentially contend with, then I would suggest a 200gr XTP at around 1200fps. If it expands there will be more damage done to anything vital and it will still punch through bone. And if it does expand you're talking about the difference between - less than a .400" hole and a .750" hole.

If it doesn't expand you are no worse off than if you would have chosen hard cast lead in the first place. A 200gr XTP @ ~1200fps is good for almost 20" penetration in clothed ballistic gel.

On the other hand, if you have larger dangerous animals and such to potentially contend with than Black Bear, the hard cast lead may be in order.

Keep in mind also, if the 2 loads you refer to above are factory loads, will they actually reach advertised velocity? If they are from Double Tap, they WON'T! And that said, you can then also throw energy numbers based on those velocity claims right out the window.

Good Luck and Stay Safe!