True Velocity of 7mm-08 - The HuntingPA.com Outdoor Community
 
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post #1 of 3 (permalink) Old 07-31-2011, 07:19 PM Thread Starter
dhd
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True Velocity of 7mm-08

Sorry I incorrectly posted this yesterday. I shoot a Win Model 70 Feather Wt. in 7mm 08 with 22" barrel It has at least 300 shots thru it and is topped with a 3 x 9 Zeiss Conquest. The accuracy with Nosler 140 Ballistic Tips behind 45.5 gr of IMR 4350 is consistently .75 to 1.2 and velocity (ProChrono) 2566-2599. The Nosler page in the loading manual indicates the velocity for this should be over 2800 fps. Of course, most loading manuals use a 26" test barrel or an 18" one. My velocity is more like the 18" model. It is nowhere near published velocity in loading manuals. I have tried many bullet and powder combos, but no come within 200 fps of published data Am I missing something
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post #2 of 3 (permalink) Old 07-31-2011, 08:28 PM
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Re: True Velocity of 7mm-08

Have you verified your clock? I have two for that very reason, a Pact and CED. If for some reason one is giving some weird numbers I have a second to compare it to. I also have a 35P at my disposal if I don't believe mine.

As far as Hodgdon's data is concerned 140/IMR 4350...
43.7 2616 38,600 CUP (start)
46.5C 2826 50,000 CUP (Max - compressed charge)


At ~2600 your not to far off depending on the component your using and your rifle. Even powder lots vary. What you seeing may be close, but what Nosler listed was using their stuff, not what you have.

Bill
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post #3 of 3 (permalink) Old 07-31-2011, 08:44 PM
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Re: True Velocity of 7mm-08

dont forget its usually from a match grade chamber/barrel which are usually much tighter and usually match grade brass that is heavier than bulk brass. end result is higher velocities...
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