Russell,
These are always personal decisions, but I can tell you what worked for me and why I set it up the way I did. My 28 gauge Perazzi is based on the MX8/20 detachable leaf spring action. I picked that action because I built the gun as a dove gun, so I wanted some weight to it. The 20 gauge action is larger and heavier than the 28 action. Additionally, the detachable trigger actions are slightly wider, and thus heavier, than the non-detachable trigger actions. My gun weighs 7.5# even.
The MX8/20 detachable trigger was available in either leaf spring or coil spring configuration. I picked the leaf spring because I felt that they might give me a slightly crisper trigger pull. The coil spring option should prove more reliable as coil springs die a little at a time. Leafs work at 100% until they go suddenly.
I picked 31.5" barrels for my 28. I wanted as much weight forward as I could get. My barrels weigh 1.490 kg and I wouldn't have minded an even 1.500 kg.
I went with fixed chokes of .016" both barrels. That's tight Mod. The gun was built for Argentine dove and I wanted the ability to take a 35 yard shot.
The rib is the flat tapered 11x7mm one. It's vented and I briefly considered a solid top rib to move more weight forward, but felt that when the barrels got really hot that the vent rib would be better. The side ribs are solid.
I shoot a 15.5" stock so I felt the long barrels would be appropriate for it. I also had the long, thin tapered field forend lengthened slightly. The pistol grip on on the stock was relaxed as I don't enjoy a tight vertical grip. Mine is more like the British field version. In fact, I ordered the gun through Andrew Litt when I was visiting him in Wales. Excellent service.
My partner at
http://www.ShotgunReport.com liked shooting my gun. He ordered essentially the same gun with 20, 28 and 410 barrels. The last time we shot together, he was enjoying shooting the 20 gauge barrels the most. I have only the 28 gauge barrels and have never had the urge to get the other gauges.
My gun has proven to be an absolute marvel at sporting clays. The tight chokes are a bit of a penalty on shots inside 25 yards, but beyond that it's amazing. Originally I considered having Teague or Briley screw choke it, but the fixed choke patterns are so utterly marvelous that I don't want to alter it. POI and convergence were dead on perfect.
If I were to do it again, I'd set it up exactly the same way. Having both barrels with identical fixed chokes is liberating in a way. No hard choices. No wasted time screwing in chokes. No nothing. Just load and shoot. Very liberating. Of course, in a hot dove corner,there's no time for any of that stuff anyway.
I did a review of this gun in the Mar/Apr 2003 issue of "Shooting Sportsman" if you have that back issue.
Enjoy speccing your gun out. That's half the fun of it.
Best regards,
Bruce Buck