Oh, I do hope Ive not spoilt your amusement.
I love it when buying pellets some people state 'I want 4.52s as my gun wont shoot 4.51s' Personally I go off the batch numbers for my rifle pellets. I can see Mr Helmet Willie sat in the German pellet factory with his micrometer sizing each individual pellet then putting them in the 4.50, 4.51 and 4.52 piles.
I shoot RWS Basics @ under £3.50/500. I dont think they even have a head size on the tin. Ive tried R10s (£8+ ) with no noticeable improvement. I admit I do size them but that only because it keeps me busy and out of mischief (most of the time ).
ATB
Ian