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Posted: 11/30/2023 12:04:25 AM EDT
[Last Edit: triburst1]
I’ve got an older 700PSS in .308 with a 26” barrel. Blueprinted, bedded in a McMillan stock, Timney trigger, Badger base and rings. It’s a phenomenal shooter and I can regularly shoot 2/3 MOA with Lake City 173 grain match.
I want to get it threaded for a Rugged suppressor mount and trying to decide what length to have it cut to. Any reason to keep it any longer than 20”? |
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IA, USA
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Posted: 11/30/2023 1:22:16 AM EDT
[#1]
Rather than cut that one consider adding a Tikka CTR .308 or add a Ruger American 300 BLK both are already threaded 5/8 24
The long barrel increases velocity and you will want the length when you get to the point you are pushing 190 SMK with Varget trying to get 2600 fps. The shorter barrel guns are fun but if you ever work out past 600 yds you will want every inch of that barrel. |
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Posted: 11/30/2023 4:10:51 AM EDT
[#2]
When I want a barrel as short as possible I first decided what the max distance is that I will be shooting it. Then run some numbers and see how short I can go while keeping the velocity supersonic just past that distance. If you are hunting with it I would look at the energy at that distance as well. I've seen many .308 rifles group well out to 1k yds with 20" and 22" barrels.
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TX, USA
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Posted: 11/30/2023 6:03:49 AM EDT
[#3]
I read that 21.75 is the proper length for a .308 as far as accuracy and velocity
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Posted: 11/30/2023 6:16:35 AM EDT
[Last Edit: thebert]
[#4]
Quote HistoryOriginally Posted By AKABARON: I read that 21.75 is the proper length for a .308 as far as accuracy and velocity I have the VS model. I read that somewere also, so I cut mine to 22". It was a sub moa rifle before with any factory load I have tried and it still is. Not the greatest of pics.  " />
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Posted: 11/30/2023 6:24:59 AM EDT
[#5]
According to this, it looks like you give up very little velocity in going down from 26” to 22”.
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Posted: 11/30/2023 8:38:03 AM EDT
[#6]
It is debatable but I have read that using a suppressor will give a slight increase in velocity.
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Posted: 11/30/2023 10:25:31 AM EDT
[#7]
Originally Posted By triburst1: I’ve got an older 700PSS in .308 with a 26” barrel. Blueprinted, bedded in a McMillan stock, Timney trigger, Badger base and rings. It’s a phenomenal shooter and I can regularly shoot 2/3 MOA with Lake City 173 grain match. I want to get it threaded for a Rugged suppressor mount and trying to decide what length to have it cut to. Any reason to keep it any longer than 20”? I would hate to chop a shooter like that. Sounds to me like an excuse to add another rifle to the collection. |
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Posted: 11/30/2023 6:56:16 PM EDT
[#8]
Quote HistoryOriginally Posted By triburst1: According to this, it looks like you give up very little velocity in going down from 26” to 22”. https://www.ar15.com/media/mediaFiles/34777/IMG_0985_png-3044704.JPG 75-100fps is a good amount of velocity to give up. Getting velocity from a suppressor is a crap shoot and it's usually not more than 10fps and non of my cans ever changed velocity. How far you plan to shoot? |
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TX, USA
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Posted: 11/30/2023 11:40:56 PM EDT
[#9]
How far do you shoot it? I have a 20 and a 16, the 20 hasn’t left the safe since I got the 16. Shoots great with plenty of power as far as i’m going to shoot it. If I need more I’m going to my 300 wm. Accuracy is not compromised by going shorter as long as they don’t screw up the chop, just a tad less velocity.
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AL, USA
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Posted: 12/1/2023 1:39:07 PM EDT
[#10]
Depends on what you want to do. For a rifle you plan to use in the field (hunting or otherwise), don't fear a shorter barrel. I decided to turn my Tikka Tac A1 6.5 Creedmoor into a hunting rifle, so I cut it back from 24" to 18" to make it handier with a suppressor mounted. Sure I lost some velocity, but it is still just as accurate and can make hits at 1000 yards just as before. It just requires a few tenths more elevation, no big deal. At what are, for me and my abilities, ethical hunting ranges it is still very much within the necessary velocity range for a bullet (I'm trying out the 143 gr ELD-X) to perform properly. Don't take my word for it though...Ryan Cleckner talks in his book (which is an excellent read) about his "main" rifle being an 18" 308 and how much he likes the maneuverability of the shorter barrel.
If it's a target rifle, leave the barrel longer. More velocity (which almost doesn't matter for target shooting), less recoil from the weight of the barrel, quieter. |
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Posted: 12/2/2023 7:16:14 PM EDT
[#11]
18-21” is about right.
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FL, USA
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Posted: 12/6/2023 11:59:34 PM EDT
[#12]
26" is what I run
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Posted: 12/7/2023 8:01:56 AM EDT
[Last Edit: ARShooter91]
[#13]
The difference between 20-26" ballistics wise isn't really much. If a 20" doesn't do it for you likely a longer barrel in same caliber won't. That said less drop is always nice, drift isn't going to change much at all picking up an extra 100fps or so
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Posted: 12/7/2023 10:48:48 AM EDT
[#14]
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Posted: 12/7/2023 10:57:31 AM EDT
[#15]
Here's the 26" 300WM and a 9" can that I mentioned being shot in a match.
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Posted: 12/7/2023 1:27:16 PM EDT
[#16]
Quote HistoryOriginally Posted By Rob01: Here's the 26" 300WM and a 9" can that I mentioned being shot in a match. https://www.ar15.com/media/mediaFiles/19859/Screenshot_2022-11-13_185132-3052115.jpg Is it cheating when you’re that close to the target? 
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Posted: 12/7/2023 11:31:11 PM EDT
[#17]
28 inch 243 and a 7 inch can.
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TX, USA
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Posted: 12/19/2023 12:06:46 AM EDT
[#18]
16 inch is the answer to all 308 questions.
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USA
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Posted: 12/24/2023 12:05:31 PM EDT
[#19]
18 inches would be the lowest I would go. 20 inches would be a good spot. Have notices when I use my can on my savage with a 24 inch barrel, accuracy picks up a bit.
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Posted: 12/25/2023 6:25:27 PM EDT
[#20]
Originally Posted By triburst1: I’ve got an older 700PSS in .308 with a 26” barrel. Blueprinted, bedded in a McMillan stock, Timney trigger, Badger base and rings. It’s a phenomenal shooter and I can regularly shoot 2/3 MOA with Lake City 173 grain match. I want to get it threaded for a Rugged suppressor mount and trying to decide what length to have it cut to. Any reason to keep it any longer than 20”? Leave it alone. Any rifle that shoots old school 173 grain bullets that well should be left alone. Try some 168's or 175's, you'll really be impressed. A lot of match rifles simply won't shoot those Vietnam era match/sniper bullets worth a damn, some rifles shoot them very well. You got lucky with yours. |
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PA, USA
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Posted: 12/27/2023 5:29:07 PM EDT
[#21]
My milspec 5r is cut to 18”, still very accurate.
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