I think, the only way to tell the difference between rimfire ammo is to test at a range with good technique. What distance are we thinking that the typical squirrel is taken, fifty feet give or take? Double that isn't really a far shot. If match ammo picks up a tenth or two of an inch in group size on paper targets, is that translating to the field?

Just have to try them out and see what works. Volume should matter too. One box of Lapuas for a season, or is the box gone in the first fifteen minutes. I like the good stuff, but save it for where I can tell the difference.