I shoot a Webley Mark IV revolver. I laid in a quantity of the Fiocchi .455 ammunition some years ago, as much for obtaining the cases as for shooting purposes. I was very disappointed with the quality of the brass cases. They are thin and brittle. Thee to five cracked upon initially firing the factory loads and handloading durability is dismal.

I've read of good things about Fiocchi brass and have experienced it myself, with other cartridges in their line. This .455 stuff is dreadful though.

A shooting friend in the UK once supplied me with the Mountain & Sowden cases and I have quantities of them. This is pretty well an "everlasting" case. I've had no issues with repeated loadings with these cases.

Both Mountain & Sowden's cartridge case production and his handgun shooting career were shut down in the 1997 UK handgun ban.

I'm still vexed about both!