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708 urgent help

 
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  #1  
Old 05-17-2012, 12:43 PM
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Join Date: Feb 2012
Location: uk
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708 urgent help

I need help with my 7mm08 I got it custom built and am really struggling to find a suitable load. I only want a velocity of 2800 fps with a 140 grain accubond I've tried a bunch of different components and powders and keep coming up at around 2650 fps on max book loads even RL-17 gives 2650 fps. I don't know if it's my load or chrono but am losing confidence to the point were I'm considering getting rid of it.
Any ideas please help
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  #2  
Old 05-17-2012, 01:58 PM
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Join Date: Jul 2010
Location: Gillette Wy
Posts: 336
Re: 708 urgent help

The reloaders nest website lists 2 loads that are over 3000FPS with the 140 gr bullet. Have you tried H414 or Win 760? here is the listing for 140 gr bullets in the 7mm-08:
28 loads available in 7mm-08 Remington with bullet weight equal 140
You may just have a slow barrel. See if one of these 2 powders help. Good luck. Bruce
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  #3  
Old 05-17-2012, 02:13 PM
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Join Date: Jun 2003
Location: Aussie in Italy
Posts: 277
Re: 708 urgent help

I had the same problem with my 7mm-08, could not break the 2800fps mark, but then again it was only a 22" barrel. With Federal light magnum factory loads it got well over 2800, close to 3K if I remember correctly.

I ended up rebarrelling the 708 to a 6.5-284, hich in terms of energy has no real gains, but because you are shoot a 6.5gn 140gn bullet, it has a much better BC and SD so you end up with better performance.
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  #4  
Old 05-17-2012, 03:08 PM
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Location: clearfield county , Pa
Posts: 626
Re: 708 urgent help

something doesn't sound right to me . I'm guessing chrony troubles .
I have two rifles in 7-08 . one with a 24 inch broughton bbl . I shoot Berger 140 VLD hunting . I use RL17 powder , and a CCI 200 primer . here is my chrony readings outside temp 75*F .


44.0 gr .....2781FPs
44.5 gr .....2788FPS
45.0 gr .....2829FPS
45.5 gr .....2853FPS
46.0 gr .....2891FPS
46.5 gr .....2924FPS
47.0 gr .....2966 FPS
47.5 gr .....3005 FPS
48.0 gr .....3054 FPS ( quickload max )
48.5gr .....3106 FPS
49.0 gr ..... error

different day 65*F
49.0gr .....3077,3077,3080,3077,3081

different day 80*F
stock Tikka 22inch bbl using Hornady 139 BTSP bullets , CCI 200 primer , IMR4064 powder

43.2 gr , 2821 , 2800 , 2805 , 2794 , 2790 ,
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  #5  
Old 05-17-2012, 07:03 PM
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Join Date: Feb 2012
Posts: 9
Re: 708 urgent help

I don't think it is the chrony. I have found that I can only get 2650-2675 FPS out of my 7-08 mountain rifle when using ABs. That is with 42 grains of Varget, which is the max book load (according to Nosler). However, 139 Interlocks (spitzers/flat base) with 41.5 grains hit 2800+ FPS. For some reason the ABs are "slower" in the 22 inch MR barrel.

Other velocities I have personally seen are:

Remington Core Lokt 140 grain factory loads - 2770
Hornady Superperformance 139 gn SSTs - 2886


Try some factory Hornady superperformance SSTs. You may find it's not worth reloading...
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  #6  
Old 05-17-2012, 07:34 PM
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Location: Bozeman, MT
Posts: 160
Re: 708 urgent help

I get a 140 accubond going right at 2800 with 42.5 gr Varget and WLR primers in a 22 inch barreled T3. What is your overall cartridge length? Are you seeing any pressure signs?
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  #7  
Old 05-17-2012, 08:43 PM
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Join Date: Feb 2012
Posts: 9
Re: 708 urgent help

I am not the OP, but my OAL is 2.243 (ogive to head measurement)...which is a ~.066 jump. That is as shallow as I can seat due to magazine box. Accuracy on the ABs average about an inch to 1.25 on 42 grains and tighten to less than an inch at 40 grns. The Interlocks are sub inch at 41.5 grns.

I have seen occasional slight pressure signs at 42 gns of varget. (slightly flattened primer edges).

I plan on trying some H414 when I have the time...
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