I've come to own one of the small ring Swedish Gustafs 96 actions rebarrelled to 308 Win. by Kimber back when. So this string about 180 gr. in the 308 is of interest to me.

Mine is quite accurate with 150 gr. Horns at ~2600 FPS, but I've been warned by somebody who may not know his stuff to avoid higher pressures or heavier pills with this action.
Are there known upper safety limits to this action I should be aware of?