Gentlemen,
I found this related and rather interesting comment on another forum this morning:
"I have a ZH204 (7x57R/12 ga) which I use like a double rifle. Brenneke slugs and 139 gr. handloads shoot to the same point out to 150 yards or so."
The gentleman making the comment is from NC.
I find it a "spot of luck" that the gent has his BRNO "Bockbuchsflinte" (BBF) shooting to the same point out to 150 yards or so but still it goes to show what having a few Brenneke slugs in one's pocket can add to the versatility of a combination gun. Yes, for all practical purposes the NC gentleman has himself a double rifle. I can see many learning more about "regulating" and reloading rifle ammunition once the Brenneke 16ga 65mm slugs have been released and look forward to reading the many posts on the subject.
Regards,
Buchseman