Scope shimming/height adjustment.......

[Neil54]

Get a strip of tin foil, as wide as you scope mount.
Make a fold at 3mm, then at 5mm, then 8mm and keep going.
You should have multiple thickness at the bottom and only one thickness at the side.

Hope this is clear. It is to me but I wrote it.

[JB101]

You could always get a 10/20moa rail that would give you the adjustment you need

[AdeC]

Never had an issue shimming mounts. Just don't go mad overtightening the top straps

[Black Beard]

Try swapping the mounts around and see if they were just made with one taller than the other.

[gsxrman]

Never had an issue shimming. People will say it can damage tube etc. but in reality, unless you are an animal it works very effectively. I use photograph negatives cut to size of mount.

[clipper]

Thanks All - I'll be brave and try shimming before I commit to spending money on mounts

[JLB]

Likely barrel droop or a bent barrel. Are you using quality mounts. Shimming is a botch at best. Get a known straight edge and sit it on top of breech block extending over the barrel, then measure the gap at the breech and muzzle to check barrel. Could also be an oversize breech seal.

John