That's nice. Wish mine had been that. It measured .370", yet shot 1" groups with 232gr., sized down .235gr., Speer 270gr., 285gr. Privi's., 293gr. TUG's and sized down 300gr. Horndys.
The sized bullets ran .367", while the commercials ran .365" to .366".
My bro now has the rifle with 286gr. Norma Alaskans loaded with 45gr. H4895, for 2,200fps. in the M96 23.4" bl. This load causes zero case web expansion on the expansion ring, from FL sized.
I ran sized down 300gr. at 2,170fps, same load, with .00025" (25 ten-thous) expansion in one or two spots only. This varied from case to case. The fired primers from both bullet weights are unchanged from newly seated, except for the dent in the middle.
Casper- 2,175fps is the velocity of the factory 286gr. 9.3x62 load of 1923(or so).