My GX40 22 likes HW FTT 5.51s ....tighter than all JSB types

The shop where I got mine when I asked about. are just said 'don't' - I don't know if that wa s'person' opinion or 'professional insight'

I'd spend my money on some else rather than a reg having used it for a while and being perfectly satisfied (and knowing the risk of trying to make something ' over perfect' )