I may be the exception to the rule of these guns shooting well. I've owned two, a 7 RM and a 300 WM. Both would have been adequate as hunting guns but neither shot noteworthy groups. Sounds like I got the lemons off the tree.
Not just you......
Back when Pella, Iowa held 1000 yard registered Benchrest matches, we had a stock gun class. Originally I shot a Sendero in 300 Ultra mag that shot damn good, and after torching that barrel, I picked up a new take off barrel in the same chambering that was a real turd, then picked up a used Sendero in 25-06 that I ended up setting the stock class record with a 4.XX" group.
I foolishly sold that gun when I bought a new Sendero in 7mm SAUM that I knew would set the world on fire. I don't think it ever broke 1 MOA, most every group was closer to a 1 1/2 MOA average, despite trying everything under the sun to improve it.....bedding, re-crown, adding weight, and necking down 300 brass & turning necks, etc. Finally sold it to a local kid for a deer gun, which would suit him just fine.