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Did my favorite alternate calibers for the AR-15 with Gun Stats.
6.8x43mm SPC II: 115gr SMK at 2,550 fps is 6d-1 pi, 760/3,200.
6.5 Grendel: 122gr Hornady SST at 2,457 fps is 6d-1 pi, 670/4,700.
I scoured teh intertoobs for that velocity and a 16" barrel so that it'd be apples to apples as much as possible. The 65Grendel Forum produced that velocity number.
What's interesting is the "starts slow, ends fast" Grendel party line is somewhat reflected in the shorter 1/2D and longer Max range.
These numbers are noticeably different from what I'd calculated before:
6.8 was 6d pi, 820/3,500
6.5 was 6d-1 pi, 800/4,400
But not too dissimilar. Close enough that I'm starting to trust Gun Stats because it's coming out closer to what I was figuring myself even if it disagrees a bit with some of the published numbers; which many are speculating got pulled out of someone's ass.
Update I:
.280 British (7mm Mk Iz), which I did myself for the M1 Dean back for 3e (and has been often compared to 6.8x43mm SPC) comes out to: 6d-1 pi, 960/4,000, with the new rules. It was 6d pi, 600/2,500 before in the 3e WW2 supplement All The Kings Men.
Update II:
Referencing this post, I also recalculated .22 ARC and 6mm ARC.
.22 ARC is 5d+1 pi, 680/4,800
6mm ARC is 5d+2 pi, 810/5,700
Considering how many rounds I calculated for FuzzyGeff and .243 rounds, I'm surprised 6mm ARC flew under his radar.
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