My Marlin 336: 170 grain Speer, chased by 35 grains of WC755 powder [surplus from Higginson's years ago]
My Marlin 336A [24"]: 170 Hornady, chased by 37 grains of Leverevolution, or the 160 Flex Tip Hornady chased
by 38 grains of the same. These loads all shoot 1"-1¼" at 100. Start a couple of grains down and work up.
Dave.