Genesis Knight
Member
quoting from wikipedia
Firearm Caliber ft-lbf joules
air gun spring .177 15 20
air gun mag spring .22 22 30
air gun PCP .22 30+ 40+
pistol .22LR 117 159
pistol 9 mm 383 519
pistol .45 ACP 416 564
rifle 5.56 × 45 mm 1,325 1,796
rifle 7.62 × 39 mm 1,527 2,070
rifle 7.62 × 51 mm 2,802 3,799
heavy .50 BMG 11,091 15,037
heavy 14.5 × 114 mm 23,744 32,000
I've only found numbers in ft-lbf (aka retardo units) for compound bows but they go from 55 to 100 ft-lbf.
e:chances are they can handwave this as a super bow that can shot an arrow as strongly as a rifle, though.
Those are cool stats (good find), but I think that we can expect a protagonist in a special nanosuit to be using a compound bow with 2x-3x the power of a typical one. (Future technology = magic).
Edit; you already kind of said this.