I was wondering how high you have to get your small guns skill before your aim with the sniper rifle is completely steady. And are there other factors, like minimum strength, standing/crouching ect?

Many thanks.

Guns 75 and I think 6 strength. You can also take a dose of steady to cancel out the drift.

I am unsure if crouching has any effect on the sway, but it does affect VATS accuracy and possibly crit chance (?? in VATS??)

If you're unsure of the requirements, bring up the weapon in your Pipboy. It shows the associated skill, skill requirement and strength requirement around the infobox where it shows you dam/dps, weight, value, etc.