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Chambering Recomendations for SBR |
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SVT_Tactical
MODERATOR Chief Sackscratch Joined: December/17/2009 Location: NorthCackalacky Status: Offline Points: 31233 |
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Posted: March/27/2018 at 10:23 |
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I'm overthinking allot her lately and want some advise or reassurance. For a SBR AR what chambering would you recommend that would equate to the flattest shooting round out to say 250yds all while trying to keep a barrel length less than 14.5? Maybe I'm chasing something that can't be done and need that told to me. What I'm wanting is to be able to zero around 200 ish and still be within 1-3" at distance from 25yds - 250yds so I could still aim at the center mass of a running coyote or hog and without worrying about holdover make a quick shot. My current thinking is a 10"-12" Grendel shooting the 90gr bullets around 2400ish FPS..... Thoughts? |
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"Most folks are about as happy as they make their minds up to be" - Abraham Lincoln
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supertool73
Optics God Superstool Joined: January/03/2008 Status: Offline Points: 11814 |
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Look at a 6.8 spc. They velocity drom from a 16" barrel to a 12" is not to bad. With a 12" barrel and shoot 85 grain tsx bullets, Data I am seeing is in the 26 to 2700ish fps
Also a 11.5 to 12" .223 and shoot 65 grain sierra game kings. They do well on yotes. |
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Tip69
Optics Master Extraordinaire Tip Stick Joined: September/27/2005 Location: Nebraska Status: Offline Points: 4155 |
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I didn't look at a short barrel... cause prolly not enough for hogs... but we love the .204 on yotes out to 300 yds
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take em!
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koshkin
MODERATOR Dark Lord of Optics Joined: June/15/2004 Location: United States Status: Offline Points: 13181 |
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You are overthinking it.
Within 250 yards, 5.56x45, 6x45, 6.8SPC and 6.5Grendel will be virtually indistinguishable from each other in terms of trajectory as long as you stay with bullets in the 75-110 grain range. Even supersonic Blackout has MPBR for a 6" target of about 230yards with 110gr Barnes out of a 14" barrel. Pick whichever cartridge you are already set-up for. ILya
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Rancid Coolaid
MODERATOR Joined: January/19/2005 Location: United States Status: Offline Points: 9318 |
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At 200 yards, any 3 MOA rig will do.
I run SBRs and most are 556 running heavier bullets for caliber with fast twist. You can go exotic, but why? Do whatever you have ammo for, it’s 200 yards. You could throw a nail at 200 yards and kill a yote. |
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helo18
Optics Jedi Knight Joined: December/02/2006 Location: Montana Status: Offline Points: 5620 |
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I would curious as to which would be quieter. I run a 10.5" 5.56 with a suppressor and it is still loud enough I like ear plugs. I may build a short barrel 6.5 grendel just to see what happens.
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koshkin
MODERATOR Dark Lord of Optics Joined: June/15/2004 Location: United States Status: Offline Points: 13181 |
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I do not think you will see any perceptible difference in sound with these calibers that are of similar velocity.
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SVT_Tactical
MODERATOR Chief Sackscratch Joined: December/17/2009 Location: NorthCackalacky Status: Offline Points: 31233 |
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Thanks..... I'm going to look at using my blackout I already have with supersonic ammo and do some testing.... its an 8" barrel now but thinking slightly more would be better here but if I can make 8" work I will. |
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"Most folks are about as happy as they make their minds up to be" - Abraham Lincoln
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Rancid Coolaid
MODERATOR Joined: January/19/2005 Location: United States Status: Offline Points: 9318 |
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What can are you using? Are you shooting indoors or heavy woods/other structures? At its core, short barrel is loud barrel. I run a 10.5" SBR quite often and it is comfortable outside and in open spaces, but yea, gets uncomfortable in environments where sound can bounce around. If you are using a 30-cal can on a 223, I have found them to be louder, even though they have higher volume. This is anecdotal, no metered data to substantiate it.
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supertool73
Optics God Superstool Joined: January/03/2008 Status: Offline Points: 11814 |
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I have a 16" and 8". Mine lost around 200 fps with super sonic loads to the shorter barrel. You will likely be around 2100 to 2200 with 110s and your 8" barrel.
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Lifetime warranty and excellent customer service don't mean a thing when your gun fails during a zombie attack.
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Rancid Coolaid
MODERATOR Joined: January/19/2005 Location: United States Status: Offline Points: 9318 |
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...And it will be appreciably louder from an 8" than it was from a 16".
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Freedom is something you take.
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supertool73
Optics God Superstool Joined: January/03/2008 Status: Offline Points: 11814 |
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Indeed. The short barrels are crazy loud.
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Lifetime warranty and excellent customer service don't mean a thing when your gun fails during a zombie attack.
"A Liberal is a person who will give away everything they don't own." |
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Tip69
Optics Master Extraordinaire Tip Stick Joined: September/27/2005 Location: Nebraska Status: Offline Points: 4155 |
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remind me what SBR is again please.....
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take em!
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supertool73
Optics God Superstool Joined: January/03/2008 Status: Offline Points: 11814 |
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Short barreled rifle. Anything under a 16" barrel you have to pay a $200 tax and get permission from the ATF.
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Lifetime warranty and excellent customer service don't mean a thing when your gun fails during a zombie attack.
"A Liberal is a person who will give away everything they don't own." |
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Tip69
Optics Master Extraordinaire Tip Stick Joined: September/27/2005 Location: Nebraska Status: Offline Points: 4155 |
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thank you Sir
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take em!
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helo18
Optics Jedi Knight Joined: December/02/2006 Location: Montana Status: Offline Points: 5620 |
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I am running the M4-2000 on the SBR. If I went up to a bigger caliber, I would probably run my Specwar 762 on it. I guess I have shot it in a few different venues. Ranges, PD hunting, fields and woods. All seems loud when shooting. Standing 3 feet back when someone else shot wasn't bad at all.
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To be prepared for War is one of the most effectual means of preserving peace.
GEORGE WASHINGTON |
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Lockjaw
Optics Journeyman Joined: May/17/2016 Location: Chelsea Status: Offline Points: 434 |
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Mine is an 11.5 in 5.56, and to be honest, I can't tell much diff between it and a 16in one as far as noise. Both of them have the regular mil spec flash hider on them.
Even when I shot it inside to get the red dot sighted in, I was expecting it to be way louder based upon what everyone here has said, and I didn't notice it either. With muffs on. I was shooting regular 55gr ammo.
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Rancid Coolaid
MODERATOR Joined: January/19/2005 Location: United States Status: Offline Points: 9318 |
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As I said, anecdotal. Your anecdotes do not align with my anecdotes. A shorter barrel means bigger fireball too. My ARs, suppressed and unsuppressed, are appreciably louder as the barrels get shorter, same ammo, same can, same shooter observing. Do you, Lockjaw, have any permanent hearing damage?
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Freedom is something you take.
Respect is something you earn. Equality is something you whine about not being given. |
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Kickboxer
MODERATOR Moderator Joined: February/13/2008 Status: Offline Points: 23679 |
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eehhh??? Whadesay??? Lockjaw: |
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Opinion,untempered by fact,is ignorance.
There are some who do not fear death... for they are more afraid of not really living |
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Urimaginaryfrnd
MODERATOR Resident Redneck Joined: June/20/2005 Location: Iowa Status: Offline Points: 14964 |
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.375 H&H
45-70 well its the thought that counts in an AR pistol length I like the 300 Blk but I've come to terms with the idea that sometimes its more important to have one ass stomping big heavy bullet than a whole herd of little ones.
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"Always do the right thing, just because it is the right thing to do". Bobby Paul Doherty Texas Ranger |
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