Long action cartridge choice?

[Creedmoor shooter]

So I have the opportunity to pick up a savage 111 in 300 win mnag for 150 bucks. I've decided to build a long range hunting rifle in a 7mm cal to shoot 180s. The cartridges I'm considering are 280AI, 7mm SAUM, and 7mm rem mag. I'm open to other suggestions but I don't want some powder hungry beast that I can't afford to shoot. Id like the rifle to come in at about 10 lbs scoped. I will be adding a muzzle brake as well. Hunting distances up to 600-700 yards on medium game and targets up to 1500-1600 yards. Looking for pros and cons of these cartridges and looking for suggestions.

 

[elkaholic]

280 Sherman will outperform Saum and A.I. and is right there with the RM. I have reached 3100 with 180's

 

[ohiohunter]

I'd run the 7rm with enough twist to shoot 195's.

 

[longrangehunterII]

That's cheap, but you'll have a magnum .532 bolt face so you'll need to stick to that size.

 

[elkaholic]

Easy to swap bolt face on a savage.

 

[Creedmoor shooter]

I was planning on swapping the bolt face if I decided to go with the 280 Ackley. I'll mention I own a Browning x-bolt 7mm RM that I use as a light weight carry rifle but it's cursed with a 9.5 twist.

 

[MudRunner2005]

.280 Sherman gets my vote, as well.

 

[Creedmoor shooter]

I understand the 7mm ss is based off the saum case. What's the parent case for the 280 Sherman? 06 based case?

 

[R.Morehouse]

7 rem mag......Off the shelf ammo....

 

[elkaholic]

I understand the 7mm ss is based off the saum case. What's the parent case for the 280 Sherman? 06 based case?

270/280 case

 

[Creedmoor shooter]

How much does the Sherman have on the 280 AI? I'm pretty confident that with a 26in I can get a 280 Ackley to spit a 180 around 2950-3000 with something like rl-26. But then again I have no experience with the 280 AI.

 

[elkaholic]

Never shot an A.I. in 280, but like I said, the Sherman will reach 3100.

 

[Canhunter35]

Since you have a 7mm rem mag, go for the Sherman. I would if I lived in the states. I've thought about rebarrelling my 257 into a 7mm wby, for me that seems like best option since I live in Canada, but something better might come along by the time I get around to it. The 28 nosler has more power and shorter barrel life than I would like.
And all the arguments about factory ammo availability, well since you already have the remmy, go for the wildcat.

 

[Huntnpack]

Take a look at the 7mm Blaser Mag.