Of course, the conversation has gone round and round about the suitability or otherwise of Marlin's Micro-Groove rifling for cast bullets, and this design seems to have caused enough people enough annoyance that Marlin offers the option of Ballard rifling for CAS and other cast lead shooters in their more traditional rifle designs.
However, the semi-old literature often made the claim that the reason paper patched bullets didn't work in current (1920'-1930's) rifles was that the old barrels were shallowly rifled especially for paper-patch bullets and the newer, deeper rifling did enough damage to same to make the accuracy not worth bothering about.
Modern experimenters have proven that claim untrue, but what about the older, paper patched rifling? Would a Micro-Groove barrel show better accuracy with paper-patched bullets than it would with grease groove ones? Has anybody tried this and noticed anything?
Just a random thought in the AM as the coffee finally kicks in.