Mickey

Of course you are right. I had forgotten with big bores one must take into account the time spent in the barrel and the beginning of recoil and its affect.

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Can anyone tell me - in a U/O does the bullets actually cross the line of sight twice?

An purely theoretical example - making up the ranges.

Say a 9.3x74R U/O double.

Regulated for say 70 yards - both barrels roughing at same impact.

Is it the case the upper barrel will say cross the line of sight at say 100 yards and the lower barrel cross the line of sight again at say 120 yards?

I am assuming the lin eof sight, upper and lower barrels will all cross only at one range, but each barrel with cross again at different ranges.

Anyone correct me, or provide a different explanatiion. Thanks.