Gun club just setup a 1000 yd. range & we are going to be starting to shoot LR silhouette. I'm going to try to use my 18" Grendel AR for starters, but was wondering of going to a 24" barrel would be any help. Thanks for any input.
Barrel Length Query
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Originally posted by 1750Shooter View PostGun club just setup a 1000 yd. range & we are going to be starting to shoot LR silhouette. I'm going to try to use my 18" Grendel AR for starters, but was wondering of going to a 24" barrel would be any help. Thanks for any input.
For any of the shooting sports, use what you have for starters while seeing what equipment works and what doesn't. Then spend money.
Remember that in the shooting sports, the easiest point you can make is the one you buy.
LR55
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What altitude is this range at?NRA Basic, Pistol, Rifle, Shotgun, RSO
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
www.AR15buildbox.com
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You'll be fine with 18". Your station pressure is probably going to average ~24.4" Hg. The 18" will push 123gr supersonic well past 1400yds at that altitude.
Using the Litz G7 BC for the 123gr SMK (.260), you'll still be supersonic at 1450yds starting with a 2500fps mv. Your difference in drop at 1000yds between an 18" and 24" will be .8 Mils. Wind deflection difference will be .1 Mils.
Buy lots of ammo, and go shoot that bad boy.NRA Basic, Pistol, Rifle, Shotgun, RSO
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
www.AR15buildbox.com
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I recently shot some proof loads in both my 18" BHW and 22" BHW. I shot the 123 AMAx through both, with CFE223 and IMR8208XBR. The 31.5 gr of CFE drove the 123 through the 18" barrel at 2509 fps, whereas the 22" barrel achieved 2647 fps. With 28.0 gr of 8208, the results were 2409 fps for the 18" and 2524 fps for the 22" barrel.
Code:Temp Powder Charge 18" 22" Diff 81 'F CFE 223 31.5 2509 2647 138 81 'F IMR 8208 XBR 28.0 2409.2 2524.4 115.2
Long and short of it is that Apples:Apples, the 4" of difference the two barrels gave me an average increase of 126 fps. Extrapolating, another 2" for the 24" barrel, it could offer an additional 60 fps, for a net of ~185 fps.
Also, it looks as if the CFE benefited from the additional length more than the 8208 did. I suspect that this had something to do with the 8208 burning faster than the CFE, but I have no other data to support this hypothesis.
So, should your shooting abilities exceed the reach of your current 18" setup, it looks to me like an additional 4-6" of barrel can up your MV between 115 - 207 fps (using the above loads as a baseline).If it's true that we are here to help others, then what exactly are the others here for?
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Originally posted by NugginFutz View PostI recently shot some proof loads in both my 18" BHW and 22" BHW. I shot the 123 AMAx through both, with CFE223 and IMR8208XBR. The 31.5 gr of CFE drove the 123 through the 18" barrel at 2509 fps, whereas the 22" barrel achieved 2647 fps. With 28.0 gr of 8208, the results were 2409 fps for the 18" and 2524 fps for the 22" barrel. (SNIP) Long and short of it is that Apples:Apples, the 4" of difference the two barrels gave me an average increase of 126 fps. Extrapolating, another 2" for the 24" barrel, it could offer an additional 60 fps, for a net of ~185 fps.Paul Peloquin
Did government credibility die of Covid or with Covid?
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Originally posted by biodsl View Post... 31.2 grains of CFE behind the 123 grain AMax is only netting me 2468 fps out of a 20" Lilja.
Originally posted by biodsl View Post... Elevation is essentially sea-level.Last edited by NugginFutz; 09-11-2015, 04:17 AM.If it's true that we are here to help others, then what exactly are the others here for?
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Originally posted by biodsl View PostI'm pretty impressed with these numbers. They significantly exceed the general 20-24 fps per inch guideline. Not to totally hi-jack this thread, I'd be interested in hearing from other BHW 22" owners (I think there are a few) if they achieving similar velocities. 31.2 grains of CFE behind the 123 grain AMax is only netting me 2468 fps out of a 20" Lilja. Elevation is essentially sea-level.
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For that type of shooting i would say 22".
I say 22" for both weight and MV in Grendel.
Personally, I always struggle with the 18" for long range. I have shot several and find them generally to be too light weight overall and too short making it difficult to keep steady on the rest or bags. They are very sensitive to trigger pull weight which is critical. My shortest AR long gun is 20" with weight added to the stock. The others are all 22"-26".
You have to be a really good to manage a short light barrel in the long game.
So the next question is barrel diameter...NRA F-Class Mid Range High Master
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Originally posted by NugginFutz View PostIn the same series, I ran 31.2 gr of CFE through the 18" BHW and averaged 2488.8 fps with the 123 Amax. The BHW's do tend to run faster MV's for the same recipes. I believe it was GLShooter who said that the BHW P3's were essentially like getting an extra 2" of barrel.
What kind of chrono are you using that gives you .decimal accuracy/readouts?? The doppler radar one? Or is this just a product of averaging odd numbers?
BHW's site does not show any 6.5G barrels. What's up with that? Are we still in Grendeland here?
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Originally posted by Grendelseeker View Post2 questions-
What kind of chrono are you using that gives you .decimal accuracy/readouts?? The doppler radar one? Or is this just a product of averaging odd numbers?
BHW's site does not show any 6.5G barrels. What's up with that? Are we still in Grendeland here?
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Originally posted by Grendelseeker View Post2 questions-
What kind of chrono are you using that gives you .decimal accuracy/readouts?? The doppler radar one? Or is this just a product of averaging odd numbers?
BHW's site does not show any 6.5G barrels. What's up with that? Are we still in Grendeland here?
Originally posted by terrywick4 View PostBHW uses 264 LBC I thinkIf it's true that we are here to help others, then what exactly are the others here for?
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