My tube feeds are not great in the accuracy dept either, with 240 gr and up slugs. Factory 240's were about 6" on a pie plate for 5 rds at 100 yds. To get them to shoot acceptable groups, I had to drop down to 180 and 200 grain slugs. Groups now are about 3" and I can hunt with that.
The bolt .44's leave me cold, but I like the idea of stainless/synthetic and the new faster twist in the bolt rifles.