I have a New England Arms 22-250 that will print a nice tight 6 inch group at 100 yards. I would get rid of it but I think it is hilarious to just take it out every once and a while and shoot it.
I bought a really cheap 223 gun off a work mate one time it was almost new and I knew it had to have something wrong with it even though it was in as new condition. Well it shot like yours , even worse about 9 inch groups at times. It took 2 years of tracking down faults to sort it out and now it shoots quite good.
Faults were as best I can remember as it's been some time.
Forend putting pressure on the barrel.
Warped stock in the bedding area .
Bolt lugs only bearing on one lug.
Firing pin nose chipped .
Firing pin jamming due to burr and rough machining inside bolt body , most likely caused the chip .
Bolt handle not closing all the way due to faulty stock inlet and lack of proper clearance at root of bolt causing the bolt to lift on firing the trigger.
Really crap made trigger that was roughly made , jerky and full of creep and backlash.
2 Stripped screws in the scope base .
I am sure I have missed one or two other minor faults .
This was one of those lemons that is just unlucky enough to cop a whole lot of faults on the one gun or it has been one of those guns that a lot of faulty parts have been swapped onto it to fix other guns and then sold to some poor unsuspecting buyer. I tend to think the later.
I bought it for a challenge as I new it had to be a real pig and it was a shocker .
At one point I thought it had me beat but eventually it came good .