While searching for the most accurate ammo for my Model 60, I tried AT LEAST 50 different kinds of ammo, about 5000 rounds total (and I got it used). In all that I had exactly 3 FTEs like you describe.
I've never taken the action apart to clean (I'm afraid to, as this thing is WAY more accurate than it has any right to be!). Just normal cleaning barrel, and the parts that are easily accessible, then ever 5-600 rounds I remove the stock, and hose the action out w/ Brakleen, the relubricate (using gun oil). It actually prefers a "dirty" barrel, accuracy won't "come in" until I've fired 4-50 rounds after cleaning.
P.S. The top three most accurate ammo in mine, from most accurate to slightly less accurate are:
Wolf Match Target
Winchester T-22
Federal "Classic" Gold Label
Mine likes standard velocity better, across the board, although itshoot most anything w/ decent accuracy, but some report just the opposite, so as mentioned YMMV, .22s are known to be finicky
I've never taken the action apart to clean (I'm afraid to, as this thing is WAY more accurate than it has any right to be!). Just normal cleaning barrel, and the parts that are easily accessible, then ever 5-600 rounds I remove the stock, and hose the action out w/ Brakleen, the relubricate (using gun oil). It actually prefers a "dirty" barrel, accuracy won't "come in" until I've fired 4-50 rounds after cleaning.
P.S. The top three most accurate ammo in mine, from most accurate to slightly less accurate are:
Wolf Match Target
Winchester T-22
Federal "Classic" Gold Label
Mine likes standard velocity better, across the board, although itshoot most anything w/ decent accuracy, but some report just the opposite, so as mentioned YMMV, .22s are known to be finicky