No one has mentioned rechambering the gun to 30-30 Ackley Improved. Sam Fadala in his book, Winchester's 30-30, Model 94, has a Storey Conversion Rifle with a 24" barrel. He shows the following velocities for the 30-30 AI for the 130-190 gr bullets on page 60. For the 150 gr = 2,550 fps mv, for the 170 gr = 2,350 fps mv and 190 gr = 2,100 fps mv. He uses 37.0 gr of H-335 for the 150 gr bullet, 37.0 gr W-748 for the 170 gr bullet and 32.0 gr IMR 3031 for the 190 gr bullet. He got 2,780 fps mv with a 130 gr bullet using 40.0 gr H-335. Using the load of 33.0 gr of IMR 3031 and a 180 gr bullet, he got 2,222 fps mv. For the 190 gr bullet he pulled bullets from the 303 Savage, but you can purchase 190 gr bullets for the 30-30 from Hawk Bullet Co. He uses the 190 gr bullets for elk and moose. The book is a great resource of anything you wanted to know about the Win 94 and the 30-30 cartridge. Especially usefull is his chapter of loads for small game. I don't know why his load info couldn't be used in a modern Marlin Cowboy with a 24" barrel with similar results. Of note is that these loads use common flat nose or round nose 30-30 bullets, not the new rubber tipped Hornady bullets.