Well, if you have the money to spend on a shotgun that holds even less ammo then we understand. The 930 SPX wasn't given the NRA's 2009 shotgun of the year because it was a piece of @#$%. But for the $600.00 or so, Mossberg did the best they could I guess.
One thing I know is that I was so surprised when I actually measured a 3" Remington Sabot only to find out it wasn't close to 3". It was actually only 2 5/8" from the crimp to brass. Then I checked one of my 2 3/4" Hornady Sabot to find it was only 2 3/8". The point here is that each manufacturers ammunition is going to vary. I do not have a clue to what ammunition OFM was using when they came up with their 7+1. I just know for some they get seven shells no problem. Others don't. But what I do know is you have a great shotgun there if you don't get too frustrated and give it away first.
First, I have a question. Why is it so important that it actually hold seven shells in the magazine especially since you are talking about the Benelli that only holds four? I use mine for hunting so I have to have a dowl anyway to limit it to 2+1. Granted, if you want to use it for three gun or extreme competitions, then that last shell may be important I guess.
Lastly, I thought you changed to the wolf spring and follower. And I know you had to send it back to OFM. I feel your pain. Mine went back twice before I ever even bothered to shoot it she was so screwed up right out of the box. But OFM made it right. And your right, you do usually get what you pay for. But man, for a few hundred extra dollars, you will have a PREMIER weapons system. Get some barrel work done, extend the forcing cone, polish the chamber, port it and you will have a weapon that will give any weapon out there a run for it's money for a whole lot less than the Benelli. And yes, I looked at that $1800.00 shotgun too before I decided on my 930 which is a much more versatle configuration. I have three barrels now and can hunt anything from Big game to quail. You should check out the Vang Comp Thread. Good info on minor things you can do to turn your 930 into a BEAST! You would think that they cookie cut these things out and they are all the same. Their not. Different batches of parts, springs etc. come in all the time. The subcontractors are selling crap to OFM and OFM is still selling EVERYTHING that they make. That's obviously why their CS sucks so bad. They still don't have to worry about CS because of those damn Zombies. But good luck to you in whatever you decide. I understand how frustrating it can be believe me.
Paul