The last tin I had was a bit old , but it seems you can buy them from a few places, even amazon https://www.amazon.co.uk/5-5MM-MILBR.../dp/B00OP9BIIK
I'm assuming they are either new or recent production as the tins are slightly different?
I'm not saying these are in the JSB quality range but in old .22 rifles they shoot ok, under an inch at 30yds is fine for plinking, it's just odd that in the last two older rifles I tried them in (Webley Vulcan and BSA Meteor) they upped the power by a whole ftlb, I assumed because they were sealing better in the bigger 5.588 bore, problem is I have run out now so will have to get another tin for testing.