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Old January 19, 2007, 08:11 PM   #1
hunter5325
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Join Date: January 19, 2007
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Nosler handload velocity

I was wondering if anyone has chrono'd their nosler handloads(5th edition). I have been reloading for some time, but have never purchased a chronograph. This is foolish I know, but I just never really thought about it. I always assumed the listed velocities would be correct. Nosler's book gives velocities well above most everyone except Barnes. I am specificaly interested in the 7mm magnum load w/ 140gr. BT's. 3340fps w/ 67.5 grains of R-22. Has anyone shot this or at least similar loads over a chrony. It seems to me that these velocities are a bit high, but who knows. P.S.- this load shoots great in my gun(m700 sps stainless 26" bbl), I just don't know how fast. Thank you for any expriences with this. Brett
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Old January 19, 2007, 08:42 PM   #2
jsflagstad
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sounds bout right

I am getting close to that (3400) with a 140 Barnes XLC over some Vihtavouri. The powder i am using is a little faster burning but close to 22.

JSF
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Old January 20, 2007, 12:54 AM   #3
Shoney
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You have already achieved the most important thing already - - Accuracy!! There are just too many variables to estimate velocity, you need a chronograph. I have seen two "identical" rifles (same make, model, barrel length, chambering) shoot the same handload with 50-75 fps average velocity difference.

A few factors which affect velocity (presuming same powder charge and primer):
Weapon - - - tightness of chamber & lockup, length of barrel, tightness & condition of bore, height & condition of lands
Case - - - thickness, capacity, alloy, trim length
Bullet - - - diameter, alloy of jacket, design of tip and base
Cartridge - - - fit in chamber, bullet distance from lands, crimp on bullet

All can and do influence the velocity.
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Old January 20, 2007, 06:33 AM   #4
2400
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Altitude, temperature, type of gun, barrel condition and chember size have a lot to do with it too.
I normally chronograph my loads at 7000' and around 65-75*. I took the same rounds and shot them at 1500' and 95*, accuracy was the same, SD was up a little and there was 147 FPS difference.
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