Official (DTA) SRS, HTI, Covert, Hunter Thread

12B.Ryan

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Sep 19, 2019
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What is this barrel shank, Ext A or Ext B? Not sure if this is the old style barrel extension or one that would work on the newer SRS A1 rifles?

Feedback appreciated.
Like everyone has said, that is an old Gen 1 barrel extension. The good news is you can send the barrel in and have the barrel extension changed to the current Gen 2 barrel extension which will work in all the chassis from Gen 2, SRS-A1, and the current SRS-A2. The barrels themselves haven't changed. Just the way the barrel extension indexes the chassis. Here at Special Purpose Rifles we can swap out the barrel extension for you so you can still use the barrels. Just message us and we can see if it makes sense to go that route as far as cost goes..
 

panhndl

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Damn you suck! I’m actually happy for you. Did you get a tracking number? Looks like they got some of the parts they needed. what did you order so I gauge how far out my kit is.
Typical kit plus a magnum bolt. Long range 26”, lite contour, 7.7, threaded, fluted, cerakote green
 
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Juggerxxx

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Typical kit plus a magnum bolt. Long range 26”, lite contour, 7.7, threaded, fluted, cerakote green
Thanks man. I just got an email with a tracking number that mine had also shipped. I sure hope the almost 200 rounds of 75elds I have loaded up for my old Tikka work in it enough to be safe yet have fun. I will report back.
 

Juggerxxx

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You will fly through that. The 223 kit is silly fun. Especially going from heavier calibers to then dropping to a suppressed 223 or muzzle brake 223. Heavy gun makes it like blasting with a 22lr
I have a suppressor and have used it on 223 gas guns with 20”, 16” and 7.5” barrels. The 20” barrel is probably hearing safe but no way on the 16” or 7.5” barrel. I have yet to use it on a 223 bolt gun. Would you say there is a noticeable difference between the two? The barrel I am getting from SAC is a 26” barrel.
 

M289

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Maybe this will increase your anticipation a little more. Shot these groups just this past Sunday. One was with varget, the other vvn140.
Did you go with the 1-6.5 twist or 1-7.7 twist barrel?

Pretty much a question for all SAC 223 Kit owners out there, what twist rate are you running? :)
 

Juggerxxx

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Maybe this will increase your anticipation a little more. Shot these groups just this past Sunday. One was with varget, the other vvn140.
Ok now your just being a dick. Just kidding. Those are some seriously awesome groups. May have to try those projectiles out if the 75elds don’t pan out.
I ordered my barrel in 7.7 twist.
 

BClrh

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I exported the Sac 223 kit minus the barrel and am having my gunsmith spinup my barrel now .
What country are you exporting to? I am in Canada and was looking at the 223 conversions. With the barrel not installed were you able to avoid going through an importer?
 

dang472

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Just put a few rounds through my SRS for the first time. Did a quick run up on powder loads for the 22 Creedmoor to see any signs of pressure. 41.0-43.0 grains of H4350 and 80gr ELDm. 41.0 gave me around 3250fps, 43.0 was 3,440. No flat primers or stiff bolt. Granted it was 100 yards but this thing is really easy to shoot well. ES Tactical 24” with APA Gen3 brake.FFBB4C13-7608-4DB8-B9C5-846F3A0D9205.jpeg
 

Juggerxxx

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Just put a few rounds through my SRS for the first time. Did a quick run up on powder loads for the 22 Creedmoor to see any signs of pressure. 41.0-43.0 grains of H4350 and 80gr ELDm. 41.0 gave me around 3250fps, 43.0 was 3,440. No flat primers or stiff bolt. Granted it was 100 yards but this thing is really easy to shoot well. ES Tactical 24” with APA Gen3 brake.View attachment 7208932
Those are some awesome velocities. what type of barrel life is typical for a 22Creed?
 

dang472

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From what I’ve read it’s probably around 1,000. This will be for a dedicated thermal coyote gun so I’m not concerned with barrel life. I’ll swap in a 6.5 barrel for day shooting the rest of the year. Another awesome trait of the Desert Tech.
 

BClrh

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I was looking at an A1 for a while and almost pulled the trigger on one but the weight was just a bit more than I wanted to deal with. At that time there was no proof barrels available and of course the a2 wasn't out. I am also looking at shorter barrel options to get the setup where I want it. I want to get a 300NM and 223 conversion.

A couple things I am going back and forth on is whether to get a A2 covert or A2. It almost looks like you can't reach the bipod cant adjustment from prone if your bipod is all the way forward on the A2?

The other thing is barrel length. If I went A2 I would be getting the 22.5 conversions in both calibers. In the covert I would be looking at the 18" barrels. I think the 18" barrel would be Just fine in the 223 but in the 300NM mag I am not sure If I want to give up that much velocity and I am a little worried about the muzzle blast with a raked muzzle brake.

Has anyone played with short barrels in magnums that can give insight on velocity loss, muzzle blast and complete powder burn?

The 18" in a covert would be a compact little rig
 
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pinhead

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You can get the Covert and run the 18” 223 and anything between 18” or 30” for the 300 NM. Muzzle blast would be pretty extreme with a braked 18” 300 NM but lots of people have the 18” 338 LM. If you are shooting suppressed most cans are rated to a caliber and then to a barrel length.
I don’t have any experience with magnums in shorter barrels though. All my magnums are 26” +.
What is your intended use for an 18” 300 NM?
 
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BClrh

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You can get the Covert and run the 18” 223 and anything between 18” or 30” for the 300 NM. Muzzle blast would be pretty extreme with a braked 18” 300 NM but lots of people have the 18” 338 LM. If you are shooting suppressed most cans are rated to a caliber and then to a barrel length.
I don’t have any experience with magnums in shorter barrels though. All my magnums are 26” +.
What is your intended use for an 18” 300 NM?
The Norma would be for mountain backpack hunting. That's the only reason I would go so extremely short on the barrel. I am in Canada so a can is not an option. I think I would likely still get somewhere between 2800-2850fps with a 215 berger in a 18" which would still make it effective on big game at long range. I was thinking maybe even a 20" in the covert, but I would like to get a proof barrel and it looks like they jump from 18" to 22.5". If I go 22.5" (which would be the longest I will go) I think would just go with the longer hand guard of the A2.
 

Snipe260

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I would go 22.5 on the Norma and call it a day. Only 6.5 inches out of the short hand guard. I had one in 27 inch in the srs and it was my favorite round!
 
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Snipe260

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I would go 22.5 on the Norma and call it a day. Only 6.5 inches out of the short hand guard. I had one in 27 inch in the srs and it was my favorite round!
I’ve decided I’m going with a 20 inch 6.5 creed in my covert.
 

BClrh

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I’ve decided I’m going with a 20 inch 6.5 creed in my covert.
If proof made a 20" I think that's what I would do as well, as you mention 6.5" isn't all that much sticking out. Do you find the reach to the bipod on the covert to be similar to a standard rifle or is it closer to the shooter?
 

pinhead

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Go with the Covert and do a 16.5” 300 NM with a light hunter profile and report out the results!
You’d be around 12 lbs + scope + mount + ammo, or 11 lbs with the A2 +scope + mount + ammo.
 
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BClrh

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Go with the Covert and do a 16.5” 300 NM with a light hunter profile and report out the results!
You’d be around 12 lbs + scope + mount + ammo, or 11 lbs with the A2 +scope + mount + ammo.
Really, 11lbs for the a2. There is a post on facebook from special purpose rifle with a a2 covert kahles scope, arc mount and an 18" proof barrel. No mag or mono pod and the Lop spacers are removed and it says it weighs 10lbs as is. If you add 5.6oz for the mono pod and 6.5oz for the mag and 1.6oz for a muzzle brake, that would put you just under or at 11lbs all set up. Or at least that's what I was hoping.

I think 18" would be the shortest I would go and if thats what I do I will report back for sure.
 
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pinhead

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I don’t have any weights for the Proof CF barrels. I was including the factory 308 barrel as a comparison.
Maybe my calcs were a bit off but my A1 Covert with the 308 factory 16.5” barrel weighs 9 lbs 8 oz (bolt, mag, buttpad); just add ammo and the scope and scope mount.

Take a pound of so off for being an A2, take off the difference in weight for the Proof 300 NM versus the factory 16” 308. add the scope and mount, maybe you are right around that 10 lb mark.
 
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pinhead

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Waiting for someone to chime in with experience with a factory 18” 338 LM. Can’t see much difference between the two in regards to muzzle blast.
 
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sixstrings101

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Guy i work with put together a 12” sbr ar10 with a pva muzzle brake against my advice......It was quickly parted out. Called it the misery machine made your face hurt shooting it or being anywhere near it.
 

biffj

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I know a number of guys running covert 338LM rifles with 18" barrels. A couple of them in Texas are shooting coyotes at 1000yds successfully. The others are out east here and don't normally shoot that far. Seems to work fine.
As far as covert vs standard length chassis goes, in a covert you can use any barrel made for the rifles. In the SRS you're limited to barrels of 22" or more. Some whine about the bipod being too close to the CG in the covert but its not a problem for most. You must choose.

Frank
 

BClrh

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I know a number of guys running covert 338LM rifles with 18" barrels. A couple of them in Texas are shooting coyotes at 1000yds successfully. The others are out east here and don't normally shoot that far. Seems to work fine.
As far as covert vs standard length chassis goes, in a covert you can use any barrel made for the rifles. In the SRS you're limited to barrels of 22" or more. Some whine about the bipod being too close to the CG in the covert but its not a problem for most. You must choose.

Frank
Thanks Frank, that's some good real world feedback. Are these guys using muzzle brakes or a can on the barrel?
 
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biffj

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Brakes, cans or bare, all of the above. I have a can for all my barrels and normally shoot with it on. I don't use brakes. I'll run with nothing before blowing all the crap off the benches next to me. I like to be a good neighbor and in the field it doesn't matter that much. If you shoot much you get used to the recoil and deal with it.

Frank
 

Snipe260

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Waiting for someone to chime in with experience with a factory 18” 338 LM. Can’t see much difference between the two in regards to muzzle blast.
The blast on 300 vs 338 is very slightly higher on the 338. Concussion that is.
 

Snipe260

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Just got a covert chassis. Wanting to go with 18 to 20 inch barrel! What calibers in short action would you suggest. Looking at Creedmore or prc? What’s your thoughts. Long range target and hunting! 1000 to 1200 yds on targets.
 

goosed

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For reference, my factory 18" vs my 26" 338 Lapua barrel show roughly 40fps per inch decline in velocity. Please do keep in mind that's a sample size of 1 of each and velocity has the potential to vary wildly from barrel to barrel.

No question muzzle flash is significant with a braked 18" 338. How much that flash effects you is a very individual preference thing... mine quickly became a suppressor only barrel.
 

BClrh

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Just got a covert chassis. Wanting to go with 18 to 20 inch barrel! What calibers in short action would you suggest. Looking at Creedmore or prc? What’s your thoughts. Long range target and hunting! 1000 to 1200 yds on targets.
I think it would be best to jump up to the 300NM in the 18". I heard somewhere that's a good combo ;)
 
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ReneM

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If you load your own ammo you can take some pressure off the muzzle blast if you use faster powder .
Just messed around in quickload , it looks like you would lose a little speed but can drop muzzle pressure by 25% and all powder burnt
 
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