My 2011 1895 GBL worked OK with the Missouri 405's but works better with Pennsylvania 405's (why are all of these bullet companies named after states?). Both shoot to about 2.5-3 inches at 100 yards out of my rifle but the Missouris do it with 35.0 grains of 3031 and unburnt powder in the action, and the Penns do it with 38.0 and no unburnt powder. Again, just my experience with my rifle.
FWIW my bore slugs at .4579. MO bullets measure at .4585 or at least mine did. Penns measure out at about .460 which is why I believe they did better for me.