What gauge wire are you using Anne? If it's 0.9mm then 3.25mm id is fine, but if it's 1.0mm, then it's too small. Byzantine is pretty AR sensitive, and really needs 3.5 give or take really not very much at all!
An AR of 3.25 will make a nice pheasible btw!
Practise your sawing on copper - if your plated wire is ferrous rather than copper cored, it will knacker your blades and be seriously hard work to cut!
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