Okay, Necro post. I just picked up an old school HK marked Benelli M1 Super 90 Defense. This was a gun I spent a decade as my go to and a gun I shot a ton. I always used full power 00 or 000 buck or Rottweil Brenneke Slugs. My old one would shoot 50 yard clover leafs with the Rottweil Brenneke. So......being I have transitioned to most of the low recoil Federal 00 buck and slugs when I went to an 870 as my primary, I am a bit out of current knowledge on the Brenneke stuff. What is the difference in the new stuff from the old Rottweil load, and what is the best bet for a dedicated slug gun. I intend this thing to be mostly run with slugs, and always had stellar luck with the Brenneke's and the M1 Super 90's as a great combo for both performance and reliability.