Has anyone tried the rat sniper slugs in there marauder

As there are no responses for you yet, I would just reccomend getting a small batch in whatever head size works best for your rifle(as you probably know) and give them a shot. 

One Marauder may like them, while the exact same caliber Marauder down the block may hate them. It's all about YOUR barrel. 

Best at of luck! Those are gnarly looking rounds