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7wsm vs. 280 AI

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Unread 02-15-2008, 12:02 AM
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Join Date: Mar 2005
Location: Utah
Posts: 1,375
7wsm vs. 280 AI

Are these two ballistic twins? I was all set to build a 7wsm when I mentioned I like to be able to top feed... Anyway, smith suggested looking at the 280 AI as it didn't have the feed issues the 7wsm has.

Can someone give me some info? Velocities for the 280 AI with 168 and 180 bergers, case dimensions and pwder capacity for the 280AI, opinions on pros and cons of the two rounds... Oh, I'll most likely be using the nosler custom brass.

I've run a couple searches without much success. I'll keep at it.

Thanks for the help.
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Unread 02-15-2008, 06:06 AM
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Join Date: Dec 2001
Posts: 999
Don't take this wrong what action are you using? The 280AI needs a longer action than the WSM bolt faces is different,followers etc. Hodgdon site has loading data for the 280AI.
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Unread 02-15-2008, 10:46 AM
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Join Date: Jan 2008
Location: Everett, WA
Posts: 421
Sierra's reloading manual gives data on both 280 AI with 26" barrel and 7wsm with 24" barrel.

For 168gr bullets both have max velocities of 2900fps but the 7wsm could do it with 7 different powders and the 280 AI with only two different powders.

There's not data for 180gr but on 175's the 7wsm max was 2850fps and the 280 AI was 2800fps, were the barrel lengths the same, the results would be slightly different. I was told by one smith that on a 7wsm for velocity go with 26.5" barrel, no longer. They're both great cartridges, I plan on building a 7wsm in the near future. Looks like the 7wsm uses about 9gr more powder in general.

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Unread 02-15-2008, 12:43 PM
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Join Date: Nov 2007
Location: Belgrade, MT
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I just started playing with my .280 Ackley this fall. 25" barrel 1:10 twist.
The first load I tried was the 168 Bergers w/ Hodgdon powder, not a hot load at all and shot 2800 fps, and .3 - .4" group at 200 yards. Shot 4 deer this fall with it and was very impressed with the Bergers.
I am planning on doing some more experimenting in the next couple of months.
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Unread 02-15-2008, 10:05 PM
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Join Date: Aug 2007
Location: bismarck ND
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I Am Shooting A Remington Action And 28 Inch Broughton Barrel Chambered In 7mm Wsm. I Am Shooing The 168 Bergers And Have Shot The 180 Bergers. My Load Right Now Has The 168 Bergers At 3075 Fps. I Had The Load Safely Over 3100 But Accuracy Was Less. The 280ai Is Closer To The 7mm Rm. Its A Good Caliber But The 7mm Wsm Has A Little Mare In It...
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Unread 02-16-2008, 12:13 AM
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Location: Utah
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Thanks for the info and the links guys. I've got a handle on the 280AI now.
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Unread 02-16-2008, 12:16 AM
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Join Date: Mar 2005
Location: Utah
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What action and what magazine? The story is I need a long action and the HS center feed mag. Only problem is I much prefer to be able to top load.
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