New barrel on 300WM Stiller wont shoot...

[Rec1er]

A buddy has just had his 300WM Stiller TAC 300 re barreled using a British cut barrel , the same manufacturer who makes barrels for Accuracy International , it all looks really good , a new Manson reamer was used , the trouble is it wont shoot , it will shoot a 2" group with the first couple of shots then the next round flies off by anything up to a couple off feet , different rounds have been tried including some factory , all crap , so we changed the scope , checked the action screws , tried it with and without the muzzle brake , still crap and having fliers that are that wild they are over two feet away from the previous POI , any ideas ? , its had around 100 rounds through it now.

Is it possible to get a crap barrel from a reputable manufacturer ? should cut barrels be lapped and maybe this one wasnt ?

We are at a loss as to what the problem is so I guess it`ll have to go back the rifle smith.

 

[lte82]

2 ft groups at 100 yards? Something is for sure wrong. Is the barrel for sure fast enough twist? Also is the barrel for sure a 308 and not a 311?

Edit: And who made the barrel? “British cut” makes it sound like it could be for a 303 British.

 

[Mormegil87]

Also check the torque on the scope base screws. Make sure they are tight.

 

[Rec1er]

Also check the torque on the scope base screws. Make sure they are tight.

Thread locked and torqued , weve tried two scopes , an IOR and a SB PM2 .

 

[Mormegil87]

Thread locked and torqued , weve tried two scopes , an IOR and a SB PM2 .

If that is the case I'm at a loss as far as the quick and easy fixes.

Your best bet is to send it in and have a smith go over it with a fine tooth comb.

 

[Gunfighter14e2]

Whats on the muzzle?

 

[fdkay]

Are you running a suppresdor? Baffle strikes?

 

[diverdon]

Barrel on tight? Good threads concentric to the chamber?

 

[Rec1er]

Are you running a suppresdor? Baffle strikes?

The rife does have an ASE moderator but we`ve tried it with , without and the same with the borelock brake , has to be an issue with the rifling I`m guessing.

 

[THEIS]

Hi,

Is this the same buddy that had slam fires in his AR15 when he pressed the bolt release?

Who is assembling your buddies firearms?

Edit: And who made the barrel? “British cut” makes it sound like it could be for a 303 British.

More than likely it is a Sassen Engineering barrel. https://www.sassenengineering.co.uk/

Sincerely,
Theis

 

[Rec1er]

Hi,

Is this the same buddy that had slam fires in his AR15 when he pressed the bolt release?

Who is assembling your buddies firearms?



More than likely it is a Sassen Engineering barrel. https://www.sassenengineering.co.uk/

Sincerely,
Theis

The slam fire AR15 was built by Schmeisser , the 300 wm barrel is a Sassen.

 

[Gunfighter14e2]

If the muzzle is not holding anything, next I would swap scopes. Before you say anything I've a buddy that chased 1-1.5moa for over 3 months before it was proved his S&B's were the problem. Even new glass has issue, don't chase yourself,...testing is way better an cheaper than guessing most of the time,...

 

[Greg Langelius *]

When dealing with an accuracy issue on a known good shooting rifle, I check:

Action bolts, crown, scope mounts, swap scope, try different ammunition. Then try another shooter; a step which can be tried at any stage of the process.

When adding/subtracting objects on the muzzle end; every change alters barrel harmonics, consequently altering load accuracy nodes.

Greg