Thread: Help with diagnosis

Well still a mystery at this stage.

Checked over that nothing was obviously loose. Nope
Double checked new rail screws not able to touch barrel, Nope couple mm clearance, tried leaning on it to.
Open floor plate and checked mag box not binding, Nope can slide it up and down a bit at both ends.
Checked ring screws, nope.
Checked torque on action screws, good.
Loosened tang screw holding forend and barrel to detect movement, nope.
Removed action completly. Checked everything was clean and tidy including lug hole. All good.
Dropped action in and out of stock a few times checking fit. Good
Re-assembly checking as I go. Rifle held vertically, hand tightend screws and gave it thump on butt. Torqued front screw to 30"lbs torqued tang to 30 checking for barrel movement. Torqued front to 50 then tang.
Removed rings and scope. Checked ring to action screws. Nope all good.

Got hungry.

Originally Posted by Bobba

Well still a mystery at this stage.

Checked over that nothing was obviously loose. Nope
Double checked new rail screws not able to touch barrel, Nope couple mm clearance, tried leaning on it to.
Open floor plate and checked mag box not binding, Nope can slide it up and down a bit at both ends.
Checked ring screws, nope.
Checked torque on action screws, good.
Loosened tang screw holding forend and barrel to detect movement, nope.
Removed action completly. Checked everything was clean and tidy including lug hole. All good.
Dropped action in and out of stock a few times checking fit. Good
Re-assembly checking as I go. Rifle held vertically, hand tightend screws and gave it thump on butt. Torqued front screw to 30"lbs torqued tang to 30 checking for barrel movement. Torqued front to 50 then tang.
Removed rings and scope. Checked ring to action screws. Nope all good.

Got hungry.

Greetings,
You seem to have eliminated all of the mechanical issues but two things remain. Rifles often shoot differently from a bipod than from a rest, sometimes less accurately due to being shot from a hard surface. The second thing is the nut behind the butt. Once the excitement starts when things go pear shaped our shooting technique goes out the window. For your next trip to the range take a friend. Get them to shoot the rifle and watch you shot as well. You may have developed some kinks in your technique that they will spot. The only thing that has changed is the bipod but that may have initiated some technique changes,
Regards Grandpamac.

Originally Posted by Bobba

Well still a mystery at this stage.

Checked over that nothing was obviously loose. Nope
Double checked new rail screws not able to touch barrel, Nope couple mm clearance, tried leaning on it to.
Open floor plate and checked mag box not binding, Nope can slide it up and down a bit at both ends.
Checked ring screws, nope.
Checked torque on action screws, good.
Loosened tang screw holding forend and barrel to detect movement, nope.
Removed action completly. Checked everything was clean and tidy including lug hole. All good.
Dropped action in and out of stock a few times checking fit. Good
Re-assembly checking as I go. Rifle held vertically, hand tightend screws and gave it thump on butt. Torqued front screw to 30"lbs torqued tang to 30 checking for barrel movement. Torqued front to 50 then tang.
Removed rings and scope. Checked ring to action screws. Nope all good.

Got hungry.

50 I'm assuming in/lb is the torque setting for a full ali bedding block stock (HSP, Manners etc) - not sure if the stug has a full bedding block? I would be looking into that as most stocks with pillars or other bedding types normally recommend less? Unlikely to be the cause of this issue though.

Maybe time to install a different scope and see if that makes any difference ... ??