Changing this from theoretical to practical, what do you have?

I have the old Lithgow Slazemger .22 RF bolt action. Started off shooting with it.

I have a Martini-Cadet.222 Rimmed. Needs to have mounts fitted and a scope.

A Martini-Henry sporting rifle in .45/70. An old rifle from the Ned Kelly era of Victoria.

And while combination shotgun rifles, I regard these as single shots, my Tikka/Valmet 512SD in 12 gauge, and 7x65R and .223.

My Mauser M03 in .222 Rem, has a magazine with a faulty spring, so is a single shot for several years as well.

I use this rifle a lot.

I would like a nice Euro break action single, lightweight, long barrelled in a medium calibre chambering. And a classic in .303 British.