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July 13, 2010, 05:06 AM | #1 |
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Join Date: July 13, 2010
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18" .308 load for 600-800yd
Im building a purpose specific 700 with an 18" barrel. All the load data i can find is with at least a 22-24". I want to be able to ring some steel or punch some hide at 800yds. What weight projectile, powder/weight would you guys recommend?
Im looking for a fast burning powder that can launch at least a 155gr sub MOA out to 600-800 (I welcome 110-125gr recipes too). I dont want to have a giant fireball due to unburned powder cause i dont want to overstress my suppressor. And theres just no need for it... more unburned powder/ more "work" for the suppressor and less noise reduction.. Since im not trying to send this round sub-sonic and without getting into a suppressor discussion, id like to ideally get 2700fps, though i realize that may not be possible. Ive seen a post similar to this but not real answers were give as to what faster burning powder load will complete in 18" and still puch the round out at a good speed, while keeping sub MOA... Its a challenge but i think theres enough parameters there for you guys.. All feeback is welcome and thanks for the help.. Last edited by Goose375; July 15, 2010 at 05:31 AM. |
July 13, 2010, 09:30 AM | #2 |
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You are going to run into some rather nasty interior balistic problems here. A faster burning powder will burn out before your bullet reaches the 16" point but at the cost of very high interior pressures. So high that your gun could blow up! I've done some checking into this problem, here is what I've found:
A good 16" barrel can be just as accuate as a 24" barrel. A 16" barrel with give you lower velocities than the same load in a 24" barrel. Using a powder other than those listed for your cartridge can be VERY dangerous; don't do it. My best advice is to check all of the powders listed for your round. There are several places that you can find burn rate charts on the internet. Compare all the powder burn rates and pick the powder with the fastest burn rate for the listed powders for your round. Once you have the best powder you can find you can start playing around with bullet types and slight changes to the charge to fine tune the round for your rifle. Sound like a fun project. Good luck with it. |
July 13, 2010, 09:34 AM | #3 |
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Pick any 155 bullet and I'd suggest starting your loads using VV N135 powder. It's the most accurate for the 308 case. You'll probably end up right at max for best accuracy.
http://www.lapua.com/index.php?id=1180 FWIW, you might consider using a 150 gr bullet. Compare the velocities of the 150 and the 155. I don't think the 155 is going to be the better choice. |
July 13, 2010, 10:01 AM | #4 |
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The load that produces the highest velocity in a long barrel will almost always produce the highest velocity in a short barrel.
QuickLoad thinks that quite a few powders could reach 2700fps with a 155gr bullet in an 18" barrel, and virtually none could do it in a 16" barrel. It looks like IMR 3031 would be a good choice, burning 100% of a slightly compressed charge. WIn748 would do it also, but without 100% burn. Accurate 4520 might be good too. All of the above will of course vary slightly depending on the specifics of your gun and the bullet chosen, not to mention powder lot, primers....
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July 15, 2010, 05:32 AM | #5 |
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Anyone else have any short barrel match loads? bump
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July 15, 2010, 05:51 AM | #6 |
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accurize + Swarovski Z6-ballistikturm
the only chance to use the rifle as long range tack-driver: accurize your 18-inch Remington as good as possible, look for some good 150/165 grs bullets and be sure to get hands on a Swarovski rifle-scope "Z6" with the option of a "ballistikturm" as well as a laser-rangefinder ........(www.swarovskioptik.at)
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July 15, 2010, 08:23 PM | #7 |
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Simply use any of the prefered powders for 308. With a Sierra 155 Palma and IMR-4064 or Varget out of an 18 loaded in the upper half of the load range it will easily reach 800 yrds at sea level on a cold day.
If you have a fast barrel a 1000 yrds is even do able but your near transonic. LP
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July 15, 2010, 08:50 PM | #8 |
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Try a Hornady 168 BTHP Match and some Vihtavouri powder. Can't remember which one it was I used for 800 yd. target, but I can look in a few days.
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July 15, 2010, 09:14 PM | #9 |
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The standby powders for .308 match loads are 4895, Varget and Reloder 15, at least around here.
Max speed will always come with the same powders, regardless of barrel length. You can optimize toward a faster powder to decrease blast and flash, but you are sacrificing ballistics. Just like a fast car, you want to go faster, you have to burn more gas to do it. That said, even from an 18" barrel, just about any of the various 155gr match bullets doing best-possible speed from the .308 cartridge should get you to 800 yards supersonic.
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