It's all subjective; everybody's tolerance is different. I don't consider my 8mm mag particularly harsh, but a lot of folks cringe at a .300 win mag that is a good 15% lower in a similar rifle. Then there are true recoil junkies who enjoy firing .458 lott or 460 weatherby (or at least they claim to).
I think on average, the most recoil people find tolerable for more than a couple of rounds is .30-06 level: 20-25 ft lbs @ about 20-22 FPS.
Tell us what your experience is, and we may be able to better help. If you find a sporting weight .30-06 with normal 165 or 180 grain loads a pussycat, you likely won't have a problem with some of the magnums. OTOH, if a .243 is the most gun you've ever fired, prolly don't want to jump right into a .338 win mag