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9.3mm Rock
Posted by steveinmi on Jan 25 2006
I'm the guy with the 9.3 Rock reamer mentioned in the thread above! Great to see the 9.3mm discussions.
It really filled all the expectations, and then some, from its design. After an exhaustive review of existing cases, the 8x68S was chosen, for a number of reasons: it's not belted, it has the largest head size that can readily fit on a standard bolt face, it feeds reliably from most magazines and it has a wide body. As was mentioned above, the 8x68 case is shortened and blown out for minimum body taper. Neck angle is 35 degrees. Case length is 2.6" (trim back to 2.6" when you hit max of 2.620"), loaded over-all length is 3.4" (30-06 length). Rifling standard is 6 groove, 1 in 10" right hand twist.
Because of brass thickness, you to watch neck diameter and may have to inside ream or outside turn the necks of cases newly formed to 9.3 Rock dimensions from 8x68.
The 9.3 Rock is an easy rifle conversion, fits on a standard length action, is accurate (as attested above) and hits hard.
A pressure barrel was made and lab tests conducted, so the ballistics are not "a wing, a prayer and a the best educated guess" but lab results at safe pressures: 250 grain bullets hit 3,000 fps. 286 gr. at almost 2,800, and the 270 grain as reported in message above.
Sure do like to see the interest in the 9.3 bore, whatever the version. We're glad we did the 9.3 Rock and are pleased with the results.
Good hunting!
Steve
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