Thumper, i was at the infancy of tuning these guns, sharing many posts with the top tuners in the UK. You are indeed correct regarding the same bolt, same slot in the head and same thread, but its the mass in the cylinder fingers that are impacted by the tightening, not affecting the 80. Eased back so that the barrel just about rests and starts to fall under its own weight if you flick the gun is ideal, but anymore, can introduce error.
I can give you the findings of what occurs due to this if you want, or see Hectors post.
Not knocking the 95 its a good gun, Hector had it as his favourite rifle behind the 52/54 at the time of his report. Tony Wall of SFS tuned 100s to his stage 1 and 2 spec but always favoured the 80, 77 and 97, but probably had it 4th.
As a point of interest, Ivan and Pope of VMach did a 23 ftlb version of the 80 Mach 1 in Turkish woodwork, lazerglided and with hand selected barrels from HW….they never bettered it..
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