No such (practical) thing as overtwist - if it won't shoot 108's then you have the option of 110's and 115's. Sometimes doesn't work the other way especially at distance . . .
To some extent its what you want from the rifle - the occasional teeny tiny group doesn't do it for me, I'd far rather have consistent day in day out 20mm @100 groups with no "pulled shots" or fliers.
To that end I've just ordered a Hardy 1:7 barrel for my "short" 550mm barrel 6mm CM, but if I'd had the option of a Lilja or Keiger I'd have gone with it.
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