I picked up a ca1950's Remington 722 in .257Bob, outfitted with a Weaver K4, about 3 years ago.
I'd taken it to the range a couple times, but couldn't get anything near the bull.
1 month ago, set it up at 100 yds with an In-Sight precision rifle sighting target to see which factory load seems to work. Only 21 of 25 shots were on paper, and none were anywhere near the appropriate point of aim. Was looking into rebarrel, re-scope, replace?
Instead, I picked up a Group Therapy Rest for under $50, built and leveled it at home, and set up a little target 25yds away in the backyard to boresight.
Moved the scope down about 4.5" in elevation in right about 1.5" windage.
THEN I cleaned the bore.
So much foulding I couldn't get a wire brush, or barbed jag with a patch, down it.
Started with the Hoppe's #9 standby on a loop jag.
Then used .243 jag, mop, and brush with gobs of Sweet's 7.62. Copper for days!
Finished cleaning and parked it.
In time, I took it back to the range, at 25 yds. Wind was intermittent, but occasionally strong enough to wiggle the whole target stand.
1st shot was 1.5" high and 1.5 left", off the grid but on the paper, so dialed in a few more clicks.
Next was dead-center in windage, but 1.75" low. So dialed it back up.
3rd was dead-center in elevation, and about 1/4" right.
Happy with that, kept going!.
Set it up at 100 yds, accounted for hitting 2 2/3" high for MPBR of 281 yds, zeroed at 25 and 240 yds.
3 shots within 1/2" up & down and 1" side to side! With Hornady factory hunting ammo much stronger than was available when this thing came out. With a probably 70 year old gun and non-adjustable 4x scope.
I really don't think I can ask for more than that!