There are all sorts of complaints about Ruger #1 rifles having issues with consistent accuracy.
I have seen some of them that are absolute jewels. That doesn't apply to most of them. That doesn't mean they don't make fine hunting rifles.
One thing that really exacerbated the accuracy issues was that Ruger went through a period of hit and miss barrels. For some, the only fix was to replace the barrels.
Even that wasn't always the answer.
I have a couple of them and I like both of them. One is rebarreled to a 338-06. It shoots the first three bullets acceptably out to 300+ yards. After those first three, POIs start to wander.
IMHO, a lot of the problems are due to the rigidity of the rear scope base. I went so far as to fill the factory base with Titanium Putty and screwing it down to the bbl before it hardened. That scope base is never coming off, without ruining it.
This rifle has a medium weight, sporter match grade barrel on it and it should shoot well. The first bullet is about 1 moa high and the next is on POA, the third is close to touching the second. After that the group opens up substantially.
IMHO, shooting consistent strings or groups, was not the intent behind the design. As a hunting rifle, it's fine.
I have a friend with an early one in 6mm Remington. It has a heavy 24 in bbl and shoots like a dream. It's one of those jewels that shoots everything well, albeit with the groups having different POIs with different brands of factory ammo or handloads. It's got close to 5k rounds through it and still maintains its accuracy.
I have a 223rem with a 22 inch heavy profile bbl and it also shoots just about everything into nice tight groups, depending on bullet weight and shape. Hates boat tail bullets.
I've done everything from installing a set screw into the fore end tang to put pressure on the bbl and make sure the fore end isn't touching any part of the receiver or barrel. Nada.
I've bedded the butt stocks to the receivers, Nada.
Done trigger jobs, lapped barrels. All of the usual fixes. Just to get mediocre at best results.
Like I said, like every other type of rifle out there, some of them are real jewels.