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Old 15th March 2013, 08:31 PM
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maestro maestro is offline
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Join Date: Nov 2009
Member of: Harriers
Location: Sutton-in-Ashfield, Notts
Posts: 613

I've tested a lot of S&B scopes, and some of them were on my rifle (massive one-piece steel mount) while others were tested just rested on a sandbag, and had exactly the same results.
My theory for gradual/jumping errors is that they at the factory know already which part is responsible for the shifts and tried to fix it somehow. But when held tight on its place, it builds up a tension as the temperature changes and and when the tension is big enough, it will jump. The facts which support this theory:
- the jumping up and back temperatures are not the same (once it jumped, it has cool down first to build up an other tension for the backwards jump),
- in 1-2 year the jumps became smaller and finally turned to continuous (the fixing has been worn down by the jumps).
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