Cantilever mount torque mishap

[fadetoblack188]

So I’ve built a bunch of rifles but I will honestly say I made a total nube mistake on this one.

I accidentally grabbed the ft lb torque wrench and not the inch lbs.

Yep. I way over torqued the cantilever mount to the upper ( aero ). Even while tightening it I am like why hasn’t this thing clicked yet.

Anyway it bent the mount. Scope was not on it yet. I threw the mount in the garbage. Put a new mount on and tightened to correct torque spec.

Now my question is. I shot it for the first time today the groups are horibleee . Like 4 - 5 inches. Is it possible that this could have affected the upper somehow bent or what ever and it’s causing this? Or would it take a ton of force to hurt that upper up there. The bolt slides freely as it should.

Or would you narrow it down to barrel/factory ammo issues.

Thanks

 

[lanemorse_04]

What brand is your barrel

 

[Im2bent]

The rail is solid I don't see how you could crush it to cause damage to the upper itself. What barrel what ammo?

 

[Runnineh]

Which torque wrench did you use when you put on the barrel?

 

[tsavo303]

Is it bent beyond surface? I think you would measurably deform it if you bent enough to affect accuracy. And guessing a simple poi shift would happen way before damage that would cause group dispersion. Scope mount prob absorbed the worst of it

 

[fadetoblack188]

Ballistic advantage

 

[fadetoblack188]

Which torque wrench did you use when you put on the barrel?

Torqued correct haha

 

[fadetoblack188]

Is it bent beyond surface? I think you would measurably deform it if you bent enough to affect accuracy. And guessing a simple poi shift would happen way before damage that would cause group dispersion. Scope mount prob absorbed the worst of it

Looks ok to me. New mount went on fine

 

[lanemorse_04]

I’ve had good luck with ba barrels. What bullets you shooting

 

[fadetoblack188]

I’ve had good luck with ba barrels. What bullets you shooting

6.5 Grendel. Hornady sst 123gr

 

[Im2bent]

Could be a lemon barrel.

 

[thehun]

Ballistic advantage

They are a hit and miss …

 

[FuhQ]

6.5 Grendel. Hornady sst 123gr

Factory Hornady ammo?

If so, there's a HUGE portion of your problem. I never got any factory Hornady ammo to group worth a fuck in my 20" DMR 6.5 Grendel, or my 16" precision bolt 6mm ARC. Hornady Custom (123 SST), Black, and Precision Hunter were all terrible groups (1.5"-2.5"). Handloads both shoots sub-1/2 MOA in the same barrels.

 

[tsavo303]

Yeah try a different ammo. Barrel might prefer something else

 

[JBoomhauer]

Ballistic advantage

Yeah try a different ammo. Barrel might prefer something else

Try a different barrel. Ammo might prefer something else.

 

[redneckbmxer24]

Ballistic advantage

There’s your problem.