New AAC SD .308 Vertical stringing BIGTIME

[Aimsmall55]

I just bought this gun 2 weeks ago. I had some 178 bthp loaded for a GA P I sold. They shot 1/2 moa first time out. I took the stock off to loosen up the trigger as much as possible. Now, every shot is higher than the next. It beats all I've ever seen. I've got a McMillan in the works right now but this stock should hold better than this!! I'm talking a 6" climb at 100 yards. About 1" up per shot. I've tried playing with the torque , notta. Luckily I've got some time tomorrow to devote to a load for this rig. But I gotta ask, what in the hell is making it climb?? The only other alteration was a surefire brake that is lined up perfectly. Please let me have it!!!

 

[-paradox-]

Have you tried factory ammo?

 

[Aimsmall55]

Have you tried factory ammo?

No, haven't been at camp where all my ammo (factory) is until tonight. I figure if it won't shoot a 168 amax , or a 168,175 fgm , it probably won't shoot. There has got to be a reason. I may put one of my NF's on it and check tracking

 

[-paradox-]

What are you using for a rear bag? Are you putting more pressure on the stock maybe after each shot? Only thing I can think of. I just got an AAC-as too and it's shooting sub moa with just a b&c stock. It's my first bolt action so I'm sure it's more capable than I am at this point.

 

[redneckbmxer24]

Unfortunately the only way to solve problems like this is trial and error. This is my input. First what did you torque it to? Factory bottom metals I run them snug then 30inlbs front, 55in lbs rear, 55in lbs front. All the times I did that sequence I never had an issue. Assuming proper torque and no shooter error the next thing I would look at is the surefire break since that's the only other thing that changed. Also make sure you didn't crack the bottom metal, they're aluminum and not hard to crack, 55in lbs should be really all you torque them to. Its always a safe bet to go over the mounts while you're at it. I'd also bring an extra scope to the range to try next if it's still not fixed.

 

[Aimsmall55]

Unfortunately the only way to solve problems like this is trial and error. This is my input. First what did you torque it to? Factory bottom metals I run them snug then 30inlbs front, 55in lbs rear, 55in lbs front. All the times I did that sequence I never had an issue. Assuming proper torque and no shooter error the next thing I would look at is the surefire break since that's the only other thing that changed. Also make sure you didn't crack the bottom metal, they're aluminum and not hard to crack, 55in lbs should be really all you torque them to. Its always a safe bet to go over the mounts while you're at it. I'd also bring an extra scope to the range to try next if it's still not fixed.

You pretty much nailed what my plan is. Start with base, change scopes, ect. I took the sure fire off and put the thread protector back on. I have a wheeler fat wrench with a socket adapter for Allen wrenches. I toured both the front and rear to SEVERAL settings although they were always the same. I will say when I took the stock off for the first time , it was WAYYY over 55 lb/in. Quite naturally I've got hs precisions flowing out the ears in Long action and my AICS is at the smith. So, I'll figure it out hopefully in the morning. Got a lot of bullets and a lot of powder... Maybe something will work

 

[Aimsmall55]

I FINALLY got it shooting. It was something I have seen before. The more I shot the tighter it got. Switched scopes also. FOUND A GOOD ONE!!

 

[redneckbmxer24]

So what was the culprit?

 

[Aimsmall55]

So what was the culprit?

Not 100% sure. Although I'm leaning towards the action screws loosening while I was shooting. I would shoot 3 1/2" shots and then .... Flyer.... Flyer. Then I'd retorque and they would start going in the same hole again. So I got some medium strength locktite and got the action screws. Going to shoot again this afternoon and see how it holds up

 

[redneckbmxer24]

What stock is it in? I'd check to see if the pillar area is cracked or weakened. I've seen that happen in some of the Tupperware stocks and it can cause the screws to loosen. If the stock is solid and it's torqued properly the screws should never loosen and don't need thread locker. I'd get to the real cause of the problem instead of bandaid it.

 

[bkw1911]

you mentioned the rifle is new and that its in a mcmillan in the works. What does that mean? Is it pillar and glass bedded? a from the factory mcmillan without pillars being torqued that heavy could give you issues. Ive never had action screws back out while firing with that small a caliber on a pillared stock.

 

[Aimsmall55]

you mentioned the rifle is new and that its in a mcmillan in the works. What does that mean? Is it pillar and glass bedded? a from the factory mcmillan without pillars being torqued that heavy could give you issues. Ive never had action screws back out while firing with that small a caliber on a pillared stock.

I mean I'm waiting on a McMillan to be delivered. I think when I was shooting the whole barreled action was moving. Just a guess. But it's shooting now. So I dunno....

 

[desert dog]

Are you using the factory Houge stock that came on the gun? If so, that POS is very sensitive to action torque and is infamous for the problems you are having. If you still have the Houge on there, that is the problem.

 

[00boraslow]

Are you using the factory Houge stock that came on the gun? If so, that POS is very sensitive to action torque and is infamous for the problems you are having. If you still have the Houge on there, that is the problem.

x2. I took my Hogue stock the first day I got mine. Not it shoots great.

 

[Hook Creek]

I don't think the hogue stock would cause that bad of an issue. I've had a few Remingtons that came with that stock, and shot them untill my new stock arrived. One inch stringing sounds more to me like something is loose, or the scope is trash. That is unless your shooting is horrible. Don't laugh I've seen guys who are lucky to hit paper at 100 Yards!

 

[redneckbmxer24]

The hogue stocks have aluminum pillars in them, no way should they cause 6" of vertical stringing. They typically don't allow the accuracy a rifle is capable of but I have never seen or heard of one causing issues like this.