No kidding!, I would have thought the lighter bullet wouldnt have had the length, but then you had a match chamber. I have some few CB Longs left from the 'abundant supply era', I should check them in a few chambers for engraving. I do know they were much better than the CB Shorts in a 'Boy's Rifle Match' we have here for the old Stevens Favorites, Rem No.6, etc. rifles on 22RF pistol course silhouettes. Open sights and offhand, great fun had by all.
That must have been the CWLS Secret Tree Rat Weapon.