Greg Tag may be along to post his views on Flues frame failures. I think in at least a couple cases, the shells in question were of the el cheapo, "promotional" variety commonly sold for $4/box or less at places like Wal-Mart. They're "light" in that they're only 7/8 oz, but velocity (and pressure) aren't light, because they need to make dirty autoloaders function properly.
I passed on a Flues 20 at a gun show last weekend, and it's still haunting me a bit. Unusually nice condition, Field Grade, but an ejector gun. 28" barrels. And, fairly unusual for a Flues, it had shootable stock dimensions. Still had the factory 2 1/2" chambers. I reload 20's, so I could've worked up light 3/4 or 7/8 oz reloads and probably had myself a pretty nice occasional grouse and woodcock gun--but I also have some 28's, which kept me from digging into my pocket for the green.
