Yes as far as I know. I’ve shot a literal ton of marlins from the bench and they pretty commonly shoot an inch or better. Caliber doesn’t seem to matter either, I’ve seen them shoot like yours in 30/30, 35, 444, 45/70, as well as the Marlin Express cartridges. Had one guy call me a liar when I sent him a test target from his 1895 conversion to 50AK. He’d sent it back claiming 4-6” groups and I shot 3 consecutive groups of 1”-1 1/4” for three at 100yds. He refused to believe his shooting and the brutal recoil may have had something to do with his large groups.