Pellets

[ashf9999]

Im shortly going to upgrade my 50 yr old springer to something (.22 calibre) a bit more modern. I’ve been using 5.6mm pellets. Will these work in a modern barrel or should I go over to 5.5 mm pellets ?

Quite possibly not ideal, but you don’t know until you try.
Depending on what pellets they are, there may be interest on here for the vintage gun collectors (so things like 1920s Webleys and BSAs etc.) Or else invest in a pellet resizer if you fancy spending many hours doing that.