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280 Ackley vs 7mm Rem.

 
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  #15  
Old 03-14-2009, 12:26 AM
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Re: 280 Ackley vs 7mm Rem.

Having loaded and shot both a lot.

Pressure for pressure, the AI won't get within 200 fps of the 7 rem mag.
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  #16  
Old 03-14-2009, 01:59 AM
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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.
That's a little closer to my experiences with the 280 RCBS Improved (22 1/2" barrel) versus my 7mm Rem Mags (24 1/2" barrels). I'd say my 7mm RMs are more like 150 fps faster than my 280 RCBS Imp. with 140 to 150 gr bullets. But again they have longer barrels.

Is your experience in rifles with equal barrel lengths? Or did your 7RMs have longer barrels?

The 280 AI I have coming has a 28" barrel. I'll be chronographing it and I'll know how this AI compares to my 7RMs with their 24 1/2" barrels in a month or two.

Last edited by phorwath; 03-14-2009 at 02:22 PM.
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  #17  
Old 03-14-2009, 11:45 AM
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Re: 280 Ackley vs 7mm Rem.

That's with the same barrel lengths. I'll bet most AI rifles are pushing 70K plus
to get the speeds they are getting. Ackley lovers, and I are one, love to boast about how
close they can get to magnum speeds with 10 grains less powder.
Not so, at least not at the same pressures of the magnum case.

My first 280 RCBS started out as a 280 Rem then was punched to the RCBS version then I punched it out to 280 AI. 500 rounds down the tube for each version. It was a Marqaurt 26" btw.

Shooting at the same pressures, I gained about 75 maybe a 100 fps over the 280 Rem. No big deal in my book.
Outside of the lack of case stretching the improved versions are overrated.

If I was building a long barrel long range rig my preference would be the
284 Win or 7 WSM I believe for the most part they get better ES than the 06 cases but then
there is always an 06 cased rifle that will prove you to be a liar.
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  #18  
Old 03-14-2009, 02:26 PM
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Re: 280 Ackley vs 7mm Rem.

If I can beg one more question out of you? You shot ~500 rounds down each version so you may be in a good position to comment. Did either of the three versions of your 280 prove more accurate for you, or less finnicky to reload for than the others?

Thanks. Aren't too many people that have covered the terrain you have with the 280s in the very same rifle and barrel.
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  #19  
Old 03-14-2009, 04:19 PM
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Re: 280 Ackley vs 7mm Rem.

Accuracy stayed the same, I owe that to the "cut rifled" barrel by Marqaurt.

I ended up turning the barrel down from .750 to .550 and cutting it to 24".
It's throat is gone but darn if it still does not shoot accurate.

My understanding is that with cut rifled barrels you can work on them after they are rifled with
no stress added to the metal. Be it fluting or turning them down. I believe it.


Outside of longer brass life the Ackley is not really needed. You can just load
up a regular 280 Rem to higher pressures.
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  #20  
Old 03-14-2009, 04:44 PM
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Re: 280 Ackley vs 7mm Rem.

Thanks,
I'll be loading Lapua brass and pushing it with stout loads provided it'll shoot at those pressures.
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  #21  
Old 03-18-2009, 11:52 AM
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Location: South Florida
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Re: 280 Ackley vs 7mm Rem.

I have been searching for a smith to do my work on my rifle, in my searching i came across what it looks like a good deal, Cooper makes a couple of 280 ackley rifles, one I believe a stainless rifle, set in a B & C Medalist stock, bedded for around MSRP $1600 or so, they also guarantee a 1/2 inch group @ 100yrds. sounds like a pretty good deal, I'll just have to see how long a waiting there is for the rifle.

Also has anyone had much experience with Cooper rifles, they look like nice guns for the money.
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