Random Optic question

[Mac.308]

Hi all,

New on this site but been shooting for years.

One thing I've always paid lip service to is the "scope height" on all he ballistic calculators.

Question... Where do I measure to on the scope? From the rail up to the scope tube or the "centre" of the scopes bore?

Thanks all.

[ovenpaa]

Measure from the centreline of the 'scope tube to the centreline of the receiver. I tend to measure from the top of the tube to the bottom of the receiver and add some math to give a true figure.

[ChAoS]

to the centreline of the receiver

Surely that should be "centre line of barrel bore", shouldn't it?

Regards,

Mark.

[ovenpaa]

Not really as I would usually expect the barrel to be central to the receiver. Problematical actions to measure in this way would be things lime the AI/AW, M65A and other flat bottomed receivers however the centre line distance can still be determined if two measurements are taken from the receiver.

Using a 6" rule of similar and gauging the centre lines by eye also works OK however it is very easy to over/under estimate which will throw your drops out very slightly when shooting at longer distances.