While not even remotely close to the quality of these shotguns, I had an AYA "Matador" 10 bore back when lead was still allowed for waterfowl. I 'worked' on the chokes as they were VERY tight and only printed modified, 66% patterns with factory #2's. The tubes were tight too, I think and the gun used to loosen the base wads in WW ammo. I modified some dies, and started loading for it, along with working on the chokes.
I got it, with a load of 54gr. Blue Dot and ounces of #2's or #3(Blimeister shot from Alberta) printing 94% right barrel, 96% left barrel in 30" at 40yards. A duck silhouette "took" 182 hits using 2 ounces of #5's. I sold it along with a very tight shooting (choke work) Browning Citori after steel shot "came in".