JP Silent Capture Spring

Slug870

Slug870

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Hey all, I'm looking at picking up a JP SCS for my Stag 10 but I noticed that there is a "Standard" and a "Heavy". Having said that, I now find myself wondering which I want/need...

Can anyone running a JP SCS in their Stag 10 help a brother out here and provide guidance? The rifle is a factory Stag 10 .308 and the JP SCS will sit in an A2 stock.

Thanks in advance!
 
I'm running the scs h2 and had the standard. The h2 has a smidge softer recoil impulse than the standard. I switched to the h2 to Increase my dwell time and it seems to have worked. I'm also running a superlative arms adj gas block and did have to close it a half turn to not vent as much gas to get my bcg to lock on an empty mag. The theory behind increasing dwell time is to improve accuracy as the case stays in the chamber until the bullet has left the muzzle. I'm positive that's what mine is doing right now as I have an sd of 3 and es of 7 fps and it is stupid accurate for a semi auto. I've shot a few 3.5-4" groups at 800 yards. It will shoot about 7/8" at 200. I'm not saying that by just increasing dwell time your accuracy increases. But it does help I'm sure.
 
ES of 7? Damn that's impressive. I know this is off topic but can you list your build list and load data? I'd love to be able to achieve similar results.
 
haun0002 said:
ES of 7? Damn that's impressive. I know this is off topic but can you list your build list and load data? I'd love to be able to achieve similar results.
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Of course.
Stag 10 reciever set. (Obvious)
Jury custom barrel 7mm08 1:8 twist 24"
Lilja ar1024 profile
Bat machine barrel extension (only one I could find that would ship to me)
Headspaced to a lantac enhanced BCG
JP SCS H2 with heavy spring
Superlative arms clamp on .936 gas block
Rifle length gas tube
Magpul PRS GEN 3
JP ENTERPRISE MKIII 15.5" forend
Timney Calvin Elite 1.5 pound trigger
Sightron SIII 8-32x56 .125 target dot
Vortex cantelever mount

Load data

Lapua 7mm08 brass
38.5 gr Varget
CCI BR2
162 hornady ELD-M
Body sized with a .004" shoulder bump
Neck sized with lee collet die
Col of 2.825"
2566 FPS muzzle velocity
3 FPS Sd and 7 FPS Es over 10 shots

Got mad because I thought I was missing a silhouette target with a 4" flapper in the middle because I couldn't see the flapper moving at 800 yards. Then my spotter told me I was sending them through the flapper

10 rounds into a 1 inch high and 3.5 inch wide group at 800 yards.

10 shots onto target at 500 m that looks like one big splatter.

The barrel is absolutely amazing. Second to no other gun I've shot. It will out shoot me on my best days. The only reason it was a 3.5" wide group was because of the wind and my lack of ability to read wind

I also made shots the same day out to 1230 yard onto a 18" circle 8/10 hit in 40 Kph wind gusts.

After 350 rounds I cleaned the barrel and it only took 5 patches with wipe out and all the copper was gone after a 10 minute soak

I believe in clamp on gas blocks not introducing compression stress points in the barrel whole heartedly like set screw blocks. I haven't had any issues with the gas block moving like so many people are scared of and avoid them because of.

I stumbled across dwell time helping accuracy in my many hours of Google foo searching for how to increase accuracy in a semi auto. I firmly believe in it now.

I dont know if I'm just lucky and the stars aligned with this rifle or if it shoots the way it does because I believe in buying good parts and using good ammo. Pretty sure it's the second one.

I will be building another upper with the same parts minus handguard in 6mm creedmoor and 6.5 creedmoor this summer when funds are available. Although the jp is nice due to the fact that I can get a 3inch wide forend plate to ride in my f class rest
 
Thanks for that! Do you find that your gas gun is hard on brass at all? Or has having everything tuned up pretty much solved that issue?

I'm in the process of building a stag 10 in 6.5 CM. I was originally going to go the SCS route but I've opted to try a flat wire spring instead. It should achieve enough delay in unlocking, but we'll see when I get it.

I'd be curious to see if anyone has used both the SCS and a flat wire spring side by side and to hear their thoughts.

That's an interesting point about the clamp on gas block. I'd love to see some imperical evidence to determine if set screw or clamp on actually have and measurable difference in the accuracy.

I purchased a JP LMOS w high pressure bolt and I'm running a IBI 19" DMR barrel. It's got a rifle length gas system so dwell shouldn't be too bad. I'm excited to finish the build though!
 
Do you guys find the JP HEAVY helps much with recoil to be worth the money? ...not that these guns are big recoilers but ya

The build quality/durability good overall? Any idea on the approx. round count these will last for?
 
haun0002 said:
Thanks for that! Do you find that your gas gun is hard on brass at all? Or has having everything tuned up pretty much solved that issue?

I'm in the process of building a stag 10 in 6.5 CM. I was originally going to go the SCS route but I've opted to try a flat wire spring instead. It should achieve enough delay in unlocking, but we'll see when I get it.

I'd be curious to see if anyone has used both the SCS and a flat wire spring side by side and to hear their thoughts.

That's an interesting point about the clamp on gas block. I'd love to see some imperical evidence to determine if set screw or clamp on actually have and measurable difference in the accuracy.

I purchased a JP LMOS w high pressure bolt and I'm running a IBI 19" DMR barrel. It's got a rifle length gas system so dwell shouldn't be too bad. I'm excited to finish the build though!
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It scratches the neck but doesnt dent the case at all. The necks are scratched by the barrel extension because the ejector spring is so stiff and has so much power.

Anything low mass does not help dwell time. To up dwell time you need heavier stuff. The lantac is the heaviest bcg I could find. 19.2 oz

Tuning the gas system to the buffer system to fine tune you ejection saves the case from getting dented
 
hannibal.black98 said:
Do you guys find the JP HEAVY helps much with recoil to be worth the money? ...not that these guns are big recoilers but ya

The build quality/durability good overall? Any idea on the approx. round count these will last for?
Click to expand...

I found it helps a bit. Not that a 14 pound 7mm08 recoils terribly. Someone with a lighter 308 shooting heavier bullets will notice the recoil more .

Yes the build quality is great. The only part I could ever see wearing out is the spring and that would just get soft over thousands of rounds. Thankfully JP sells springs separately.

The absolute best part about the scs is no more twang from the spring when shooting. It is called silent captured spring after all.
 
Get the armaspec version as it is cheaper. Did not notice. Adifference between my armaspec and my friends JP
 
greg olmstead said:
I found it helps a bit. Not that a 14 pound 7mm08 recoils terribly. Someone with a lighter 308 shooting heavier bullets will notice the recoil more .

Yes the build quality is great. The only part I could ever see wearing out is the spring and that would just get soft over thousands of rounds. Thankfully JP sells springs separately.

The absolute best part about the scs is no more twang from the spring when shooting. It is called silent captured spring after all.
Click to expand...

Thanks!!!

Will add one to my parts list :)
 
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