I just want to provide some of my findings. I have been exclusively trying to get these slugs to work in a 22 700mm FX maverick. I am shooting them at about 1000 ft/s 160 bar/125 bar shooting on PW 7 with 11gram hammer. I have shot many groups unlubed and lubed. I find that the lube really does help and shrink the groups. I would shoot a day of unlubed, and then another day of lubed and another day of unlubed, about half a box each day.
I believe the reason it helps is because the .218 is tighter and so I am guessing a little lube helps. It might have less of an effect if you use a smaller diameter slug that is more loose in the liner. I just use silicone spray lube.
I know some say lube doesn't do make any differences, but for me it definitely shrank the group at 86 yards, probably shrank about an 1/2 inch to 1 inch.
I believe the reason it helps is because the .218 is tighter and so I am guessing a little lube helps. It might have less of an effect if you use a smaller diameter slug that is more loose in the liner. I just use silicone spray lube.
I know some say lube doesn't do make any differences, but for me it definitely shrank the group at 86 yards, probably shrank about an 1/2 inch to 1 inch.