Pops bought a used one 1B in .22-250.
Orig owner had to send it back to Ruger for new bbl not long after he got it.
Was an older redpad. Earlier than mine.....and mine from the mid 70's (1B .243 win which shot great).
Current #1 is also a .243 win, 1985 model.........RSI.
One factory load cloverleafs at 80 yards.