Biathlon also has a slightly smaller bullet diameter.
https://www.eleyammunition.com/eley-match-biathlon-22lr/
Yes, you are right.I couldn't look at the link (my network issues) so this may have been addressed.
I thought Biathlon had a smaller diameter for the entire cartridge, not just the bullet. As an aid to smoother clambering in very cold conditions.
Dave

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