My 9.3x62 was a double square bridge Brno Mod. 21, that had a damaged barrel, probably from a cleaning rod or something..I had the barrel copied and the original barrel band rear sight, barrel band front sight and the barrel band sling swivel reinstalled and since it was copied the inletting was good to go. The only change was I went with a 26 inch barrel as the 9.3x62 really appreciates those long tubes in the velocity dept.
I get 2552 FPS with a 286 gr. Nosler, 2700 FPS plus a bit with a 250 Barnes X, and 2419 av. FPS with the wonderful 320 gr. Woodleigh SP and solids..Pretty close to my 375 H&H with a 300 gr. bullet at 2500 FPS so I shoot 20 grs. more bullet in the 9.x62 but my 375 gets me another 100 FPS over the 9.3, so thats about a push...That said I could pump up the 375 another 100 FPS os so..
I had very little tweeking to make the 9.3x62 feed in the Brnos long box. Only a tad of rail work. Gun would appear totally original to most folks, but its not, and Brno never made the gun in 9.3x62, only 7x57, 6.5x57, 7x64 and 8x57...It was an interesting project and gave me a 8 lb. rifle to pack all day in the African heat for Buff or Lion and it holds 5 rounds. Not a bad deal at all.
