Anyone here old enough to remember Sellier & Bellot? An imported cartridge that had the sole selling point of cheapness.
In the eighties myself and a couple of chums had a rough shoot just North of Brighton, and one very cold and snowy winter we found we were spending more than we wished on cartridges. I was using my Greener (as per avatar), one chum was using his Russell Hillsdon (aka Webley & Scott from the fifties) and my other chum was using a Browning Twelvette, which he had acquired for next to nothing from a local auction. He had been experiencing constant failure-to-feed problems with the thing, but was very fond of it which astonished us. He was (and is) a prominent dealer and specialist in antique arms and armour; you really would have thought that anything so vulgar as a Browning semi-auto would have been very much beneath him. But he persevered.
We purchased a couple of large boxes of these foreign cartridges, and off we went. It was customary for us to wander round the patch doing a sort of armed reconnaissance, and that's how we started off. Lots of singleton pigeons were scuttling around, and we each were firing occasional shots, with mixed success. And with mixed amounts of bang. Sometimes the report was muffled, accompanied by flame out of the muzzle and fluttering debris, usually with the bird happily flapping off into the distance with nary a feather out of place. Sometimes the bang would be just what we expected. And sometimes there was the almighty crack of an anti tank gun, accompanied by a pained expression as the agony from the distressed shoulder registered.
Some of the lesser explosions produced a visible (just) shot string, together with a noticeably downward trend in the trajectory.
But the last shot of the day was fired by my chum with the Twelvette. It was an terrific crack, truly thunderous, really quite shocking. The pigeon concerned sort of disintegrated - a really clean kill in one way but not in others. "Oh S**t!!" said my chum, and we went over to have a look. He was on his hands and knees in the snow looking for bits of Browning. That cartridge had marmalised the thing's innards, and broken bits had fallen out into the snow.
I haven't used cheap cartridges since that day until I started using Armusas from the local Clay Club.