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280 Ackley vs 7mm Rem.

 
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  #29  
Old 11-13-2012, 06:48 AM
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Join Date: Jun 2012
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Re: 280 Ackley vs 7mm Rem.

Had a 280 built on a 700 action with # 4 contour bbl and titanium firing pin Kevlar stock. Weighed 7.2 lbs. scope will take some research but this gun shoots sub bore groups most of the time when I'm on my game.
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  #30  
Old 11-13-2012, 07:23 AM
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Re: 280 Ackley vs 7mm Rem.

Thanks for the advice 41mag.
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  #31  
Old 11-14-2012, 02:01 PM
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Re: 280 Ackley vs 7mm Rem.

Quote:
Originally Posted by su37 View Post
Having loaded and shot both a lot.
Pressure for pressure, the AI won't get within 200 fps of the 7 rem mag.
Comparing cartridge performance with Quickload and Quicktarget at close to optimum powder choice and 65kpsi the two get within 110 fps.
The problem is that the max practical usage of the 280AI will be ~ 67kpsi and the max practical for the 7mmRM will be ~ 71 kpsi. This is because the 7mmRM case head is stronger.
I would imagine that using loads based on real work ups that the 280AI at 67kpsi would be ~ 200 fps slower than the 7mmRM at 71kpsi.
That 200 fps represents 100 yards for velocity.

7mmT/CU ............. ...........26.1 gr H335 2330 fps -471 yards
7-30 Waters ........................30 gr W748 2456 fps -395 yards
7mmBR ..................... ......31.2 gr W748 2510 fps -360 yards
7mm IHMSA ........... ............40.2 gr Re17 2704 fps -247 yards
7mm-08 ............... ........40.6 gr IMR4895 2789 fps -198 yards
7mm-08AckleyImproved ..... ....43.6 gr Re15 2833 fps -171 yards
7x57mm ...........................44.6 gr Re15 2843 fps -165 yards
7x57mmAckleyImproved ... ......46.4 gr Re15 2873 fps -150 yards
284Win ........................50.0 gr IMR4350 2890 fps -172 yards
280Rem ...........................53.5 gr H414 2961 fps -152 yards
7mm Rem short action ultra mag 55.5 gr Re17 3015 fps -73 yards
280RemAckleyImproved ....... .57 gr IMR4350 3019 fps -71 yards
7mmRemMag .................... ..68.2 gr Re22 3129 fps -15 yards

7mmRem ultra mag ........ ....83.3 gr IMR7828 3130 fps -15 yards
7mmWeathMag ............. .......71.8 gr Re22 3170 fps +7 yards
7mmSTW ........... ..82.2 gr Ramshot Magnum 3158 fps 0 yards
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  #32  
Old 11-15-2012, 01:15 PM
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Join Date: Apr 2005
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Re: 280 Ackley vs 7mm Rem.

Both of my 280 AIs deliver ~150-175 fps less MV than my 7mm RMs with handloads worked up to maximum operating pressures in all rifles.
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