Woodleigh does make a 320 gr. solid in 9.3 and have been using them in my CZ 550 9.3x62.
Of course the distance at which a buff might start its charge may be irrelevant as many are in thick cover and may bust out at touching distance! Then it does matter when it is a bolt or double.
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Bill Stewart
Once you have been amongst them, there is no such thing as too much gun.