Howdy,
Harry O said: "What Bitterroot said about the Marlin is correct. It is accurate (provided you use 0.431" or 0.432" bullets). However, in doing that the case comes out almost straight and gets worked a lot when being reloaded. Short case life. I had problems with that one with crimp grooves, too."
I derived tack-driving accuracy from my Marlin using .428" lead bullets. My rifle is a pre-Centennial 1894 that was part of a special order from some sporting goods distributor back in the 1980's. It has the standard .430" Microgroove barrel. I have seen no deformed brass upon firing factory ammo or my reloads. Maybe the later cowboy versions were a little wierd, but mine shoots just great.
A note about the Lyman #427098 bullet. The ogive starts very low on the bullet and most crimping dies won't fold the brass enough to completely form the mouth to the bullet. I have an old (circa 1880) tong tool that I use following seating and partial crimping with standard dies. Brass can be trimmed to move the case mouth back, but as long as I have my crimping tool, I will avoid doing that. The #427098 is a great bullet that holds a lot of grease, but I only use it with FFg.
A better bullet is the Lee 200gr RNFP. It has two grease grooves and a crimp groove in the right location. For smokeless, I use Lasercast, or whoever makes a clean .428" 200gr RNFP cowboy bullet. The crimp grooves are always in the right spot and OAL works in the '73 and Marlin.
I prefer Winchester brass as it is the thinnest and will hold more BP than the other makers. The thin brass also swells and seals the chamber tightly, leaving virtually no fouling in the action. I have loaded them several times and have only discarded two, so far (in the heat of battle they were loaded on-the-clock into a .45 Colt Vaquero. They hit the target, but without much authority!).
Good luck,
Bitterroot