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Greetings All,
Assuming that you have a right twist barrel Woods223 the Coriolis Effect works counter to Gyroscopic Drift in the Southern Hemisphere so should be subtracted from rather than added to...

Greetings dead is better,
Thanks for your post. I admit that i was a little vague about the extent of drift so will need to read some more about it. Every day you learn something new is a good day....

Greetings Tararua Phil,
There are a couple of factors that make longer range verification of your zero advisable. The first is drift, called spin drift in the US. Drift is due to the rotation of the...