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5300 joules is only 3,910fpe. Both Steve and I run 2,520fps with 286gr In our 9.3x62's That's well about 4,050fpe. As well, I run 2,675fps with 270s, also well over 4,000fpe but I don't know of any that aren't crap in 9.3. These ballistics were in my Oberndorf Mauser sporter.
That's pretty impressive velocity for a 62! Highest velocity I've seen in published data is ~2400 FPS with a 26" bl. I would be curious to see pressure figures for your loads at 2520 FPS.
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