depends on your table, but as a rough guideline raise sizes should start high at low stakes and gradually decrease, because at higher stakes smaller raises achieve everything a large raise does.
At low stakes you can do anything from 5-8x and still get action, once you reach 20nl around 4x is adequate, and once you're at 50nl I think you don't generally want to go above 3x.
But if you're at a station table, raise your sizes until you're getting the amount of callers you want, then stick with that. If they're all willing to call 4x, see how they like 5x. If they still like it, push it higher. If they're very tight and won't even call 3x raises, widen your opening range to include more hands.
There's no such thing as a 'perfect' opening size.
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At low stakes you can do anything from 5-8x and still get action, once you reach 20nl around 4x is adequate, and once you're at 50nl I think you don't generally want to go above 3x.
But if you're at a station table, raise your sizes until you're getting the amount of callers you want, then stick with that. If they're all willing to call 4x, see how they like 5x. If they still like it, push it higher. If they're very tight and won't even call 3x raises, widen your opening range to include more hands.
There's no such thing as a 'perfect' opening size.