You are both correct (Kiwi Greg and Crzyman) the higher mag emphasises the unsteadiness; using a lower mag is useful for a person who may be put off when observing the degree of unsteadiness - both have their place. If you can hold steady aka bench-rest, then in mirage-free conditions, the higher mag certainly produces an enhanced sight picture.
A relatively cheap scope - but one that I've had a few years of good use from (dialling I might add) is a 4.5-14x40 Swift Premier with mil dot. It's brighter in dim conditions than my Loopy VXIII of same power. The Swift might fold up in time to come but it's never given me a problem to date and has seen quite a bit of use. It sits on and suits my 222. Only drawback is that its AO adjustment is at the front obj bell instead of at the turret housing.
If you can afford it though - buy once cry once.
I would endorse the comment above that around 14 is optimum as you will find that above that you will very often pick up way too much mirage for confident shooting (much like emphasised unsteadiness at the higher magnifications).
My 2c worth.
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