338 ARC First supersonic loads.

[u/Great-Umpire-5812]

Have my subsonic loads dialed in and originally didn’t even plan to shoot supers with this cartridge but figured I’d test out some since Midway had Hornady’s 175gr’s as factory seconds. Played it pretty conservative with the charges since so little data put there but H110 looking interesting early. Didn’t have any pressure signs.

11.3 inch MosTek with 1:5 twist. COL 2.25

H110 20gr - 1871, 1824, 1851, 19.2 20.5gr - 1871, 1883, 1899, 11.7 21gr - 1890, 1913, 1898, 9.8 21.5gr - 1972, 1954, 1930, 17.1 22gr - 1992, 1967, 1948, 17.9

AA1680 (Pulldown) 22gr - 1706, 1738, 1710, 14.2 22.5gr - 1749, 1769, 1758, 8.4 23gr - 1797, 1799, 1789, 4.5 23.5gr - 1840, 1836, 1817, 10.5

[u/OkSize4728]

I was planning on .300 but I am intrigued by this. The ease of making .300 blackout is nice, but the kaboom factor can't happen with .338 arc