Miller,
I may have pointed this out prior to today, but, one Francis E. Sell seemed to have a lot to say about those Richland guns, and may have had a hand in designing them for the US market.
There is a copy of an article he wrote promoting all things 20 gauge, 3 inch, backbores, long parallel chokes, and, what not, in the 1968 Richland Firearms catalog. In 1977, an article in "Gun Digest" goes into great detail of how a 20 should be chambered, bored, choked and used to get good results with modern 3" 20 gauge ammunition.
I still have the NIB 707 20 gauge copy that showed up here as a gift from a friend. It is heavier than I imagined, a full 6 1/2 lbs, heavier than a very similar Spanish 12 gauge boxlock that greatly resembles it, but, were a guy to lay in a supply of 3" 20, you could use the stuff, at any rate. The Spanish 12 is also chambered for 3", and I'd sooner sit in sh!* than try a 3" round in that gun! I tried a few rounds of 3" 20 gauge loads in a Ruger Red Label I owned many years past, patterns were truly unimpressive for the cost and pounding that came with those loads.
Maybe things have changed?
A visual inspection shows a lot of effort went into polishing the bores of the 707 gun. Beautifully done.
I will give it a run on pheasants later this year, most likely with 1 oz of 6s in a standard 2 3/4" high brass loading.
Best,
Ted
