I believe 850 bars would be 12,328psi or there about. It's not telling you what the pressure of the shell is. What it's saying is the gun you use them in should have been proofed for 850 bars. Did you cut apart both shells to see if the powder was the same and throwing the same weight ? If not you can't say they're both throwing the same amount of powder. The pressure is determined by how much the shot, wad, and powder weigh times the velocity squared. The size of the shot has nothing to do with it. Most handloads for old shotgun are usually kept under 7500psi, depending on who's doing the loading. Some like under 7000, others under 8000psi. Usually, but not always, when velocity goes up the recoil goes up. Out of respect for the 100+ year old wood we like less of each.
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Paul Harm
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