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Both gentlemen are correct.
You may also have to shoot slower. I don't mean bullet speed, I mean time between shots. Let that spaghetti barrel cool back down between shots and it may behave better.
Skinny barrels can shoot, but they sometimes need a little more TLC. You may have to rebed the gun. Sometimes a bit of upward stock pressure is better than freefloating a thin barrel, too.
Of the three powders you've tried, I'd only rate the Varget as being better suited to this round. Benchmark is a bit fast and 4350 a tad slow. Classic powders for it are in the H-380/Varget/4064/4895/RL-15/W760 area. I'd be reaching for one of those if I were loading it.
That goes for 55-grain bullets, too. That's the classic weight for this round, and most guns are designed for it.
And do let a proven bench shooter print a few groups, too. As mentioned above, it may not be the gun or the load!
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