6mm spectre… Seems conflicted. 338 spectre was high-BC, high mass subsonic. This looks like just another long range 6mm design stuffed into an AR, so why use the spectre name?
I had a 338 spectre. Simply necked down 10mm magnum brass to 338, load and shoot. Traded it for a 300 Blackout when I didn’t have time for reloading anymore.