Thinks Phil et a for your responses - except RB - for that jibe I will see you at IISAC naglers as 20 paces.
OK I measured the scopes I have and decided on the following measurements
Scope size internal measurement objective lip centre measurement assume central bar of 12mm bar size
ED80 80mm 108 80 12 0 12 12
127ED 127 148 127 12 0 12 6
C8 203.2 226 203.2 12 70 12 12
R200SS 200 220 200 12 65 12 5
LX200R 250 284 250 14 86 12 15
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