Have noticed that some of the lever's spring loaded latches are not getting a full "bite" into the notich that loackst them. Length is worng, and some are just ahnging on by the very tip...and that tips wears with use.
Cure is to CAREFULLY drive out the little pin that holds that spiring loaded latch...the latch and coil spring that holds it will come free from the loading leaver. The latch is "split"...deepen the notch with a needle file. By deepening the notch, the latch will stick out farther and fully engage the notched stud on the barrel. Can also streach the spring a bit to increase tenstion, but usually full depth contact does the trick.
Has an added bonus...by having the notch engage fully, it's still under a little spring tension, and the lever won't rattle.
Not just a rem. problem...have had Colt-clones with that rattle and barely engauged leaver latch. Did the same thing to them, setting them for a bit of spring tension when locked into place...removed that loading leaver rattle sound.
Conicals can shoot well...the only "trick" is that if they aren't seated straight, they won't shoot straight. Easier to "cock" a conical in seating...ball is too "dumb" to seat crooked.