Wow, there is so much "win" on this thread it is shocking.
First, a quick search shows commercially available ammo available for the 38-55 running a 255 @ 2950.... so it is not at all a stretch to run a 255 at 2100 - is it "over pressure" for the cartridge design? Yes, it very likely is. Is it over pressure for the rifle in question, possibly but obviously not catastrophically.
FYI you cannot "convert" CUP to PSI. You can make an educated guess, but that's it.
As for the continued assertion that a 255gr ~.377 bullet will become "unstable" as it changes state from supersonic to subsonic show a lack of understanding of ballistics. Will a long nosed, ultra high BC Berger become a tumbling hunk of metal changing states? Absolutely. Will a heavy, stout, sub 2.5 BC lose its stability making the same transition? Maybe some should get that figured out before commenting further.
Do the "naysayers" have personal experience with Rman that would cause them to disbelieve his marksmanship? Or are you just unable to accept it?
I don't know Rman, but I have no reason to doubt his claim. Now, if he later admitted that he was actually leaning on the hood of his truck....
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