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The twist is supposedly to enhance damage. I guess the theory is to maximize energy transfer, spin the bullet faster if it can't be pushed as fast.
 
With the Sig Rattler (1:5" twist) there were people that had issues spinning Vmax's apart and damaging suppressors. Hornady responded to these accounts and provided the fact that out of the Rattler barrel length (I believe it is 5.5") the vmax's would have been spinning at 331,000 rpms. So there is some concerns when one is talking about 1:3" twist and the option of supers and subs.
 
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It’s pretty easy to tear apart 147 ELD’s in 6.5 creed, and certainly easy to tear apart 40-45grn bullets in 223 and 22-250… guys just have to understand what they own and load accordingly.
 
The chart in the OP appears to be a realistic and correct chart. The charts is the ballistics for 210 gr Barnes TSX-BT bullet with a BC of .482 G1 launched at 2450 fps. If you plug those numbers into a ballistic program you get pretty much the same numbers as present in the chart in the OP.

Whether this new cartridge can launch that particular bullet at that velocity is the only question. The trajectory is realistic.
 
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