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Old August 8th, 2013, 03:14 PM #1
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Remington 700 AAC-SD .308, 16.5" or 20"??

Looking hard at this as a deer and target rifle. The times I'll have to take a shot over 200-300 yards will be extremely limited, but I've read that both will handle that range no problem. Most shots at deer will be less than 100 yards. I'm torn though between the 16.5" and 20" lengths. What are the cons and benefits to either length for the applications I mentioned?

Also, are there any benefits to going with the non-threaded 700 SPS Tactical vs the AAC-SD? This will be my first bolt gun that is not a .22lr.

Thanks in advance for guidance.
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Old August 8th, 2013, 03:24 PM #2
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I'd get the shorter barrel, just for weight and size. Threaded allows you to put a suppressor on it later if you become so inclined.

Just saw a 16.5 in 223 and 308 at Atlantic Guns this afternoon, and one in 300blk at Engage Armament.
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Old August 8th, 2013, 03:50 PM #3
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Be aware that a 16" 308 will have lower velocities that will affect your trajectory. For a BA 308, I'd go with a 20".
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Old August 8th, 2013, 03:53 PM #4
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I'd just get the 20" for the added velocity. I own the 20" and it's really manageble length and weight wise.
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Old August 8th, 2013, 04:15 PM #5
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How many FPS difference are we talking at the muzzle, 100, 200,600 yards? Is it substantial?
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Old August 8th, 2013, 04:43 PM #6
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Quote:
Originally Posted by TyFromMD View Post
How many FPS difference are we talking at the muzzle, 100, 200,600 yards? Is it substantial?
The 16", yes. With my 16" AR, 41.0gr of Varget and 175gr SMK gets me ~2400fps. in my 24" bolt action, I get ~2600 with 41.0gr of Varget.
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Old August 8th, 2013, 04:44 PM #7
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Depends on the load I believe.

I think if you buy the 16, you'll eventually want the 20. You say it's for deer and <300, but the call of longer ranges will eventually get to you. Just my two cents.

Have it and not need it, or need it and not have it.
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Old August 8th, 2013, 04:51 PM #8
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Both of those rounds are optimum in a 22 inch barrel. Going from 22" to 20" will be losing about 25-50 fps. Going from 20" to 16.5" you'll see 50-78 fps loss. Your trajectory tables will give the loss of velocity at different ranges
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Old August 9th, 2013, 09:18 AM #9
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YES, substantial difference in performance at long range.

At 200, shorter it fine.

I just finished a long range course. I was shooting my .308 bolt gun with a 24" barrel. Another student was shooting a 20" barrel AR-10.

I was hitting steel at 1200 yards. He could not get on the steel at 1000 yards, as his loads were going subsonic by then.
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Old August 9th, 2013, 09:28 AM #10
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Just as an example to for the MV numbers I get 2685 fps on my 24" 5R with 41gr Varget. So when scaling down the length, the MV curve bends pretty sharply after about 20". I'd stick with the 20".

Tinker with the JBM Ballistic Calculator and see what kind of difference you will see at 300 yards. I'm betting the adjustment difference or hold-over will be substantial from a 100 yard zero with a projectile of that weight going that slow.

http://www.jbmballistics.com/cgi-bin/jbmtraj-5.1.cgi

Edit: Just did the calculation on the SMK 175 and there is a 3.4 inch difference in drop at 300 yards between the two 2400 and 2600 fps.
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