recently i have had trouble achieving any kind of consistency WRT accuaracy from my antique 0.22" (pre 2000AD) air rifles.
what has transpired is that the UK air gun and ammo manufacturers have deserted the uk market in preference to european/US sales.
(the UK market should therefor abandon the UK manufacturers in my opinion).
one thing that i have found, however, is that older pellets may have been even bigger on skirt diameter that 5.6mm, the "old" .22" diameter.
pellets from a tin of "wasp" from the '60s or so measures 5.78-5.83mm across the skirt!
does any one else have vintage pellets that could be measured?