Well I've been having a play with this old girl now, it is in 577/450 (Bugger) was hoping for 500Ex No2 but that's the way it goes .

On the bright side bore is near mint, but what a prick of a cartridge to load in Nitro, never had so many squib & miss fire's in my life, a bit scary, thought I could do some damage, even got some BP worked great, but 85gr of Goex FFg & 400gr Rem slug kicked like a Mule & what a mess to clean, both case's & barrel !

I used Magtech 24ga brass shot shells, the first few went great & I got cocky & crumpled the next couple, I think I annealed them too much, still much cheaper than wrecking my 577NE cases !

Got a couple of loads to work now, but need more testing yet .