What ammo is the Army using for .300 Win Mag?

[500grains]

What ammo / bullet is the Army using for the 300 Win Mag sniper rifles?

Any field reports (not that I would expect it would not work, just wondering about any initial impressions / remarks)?

[DocGKR]

The "system" has the old A191 190 gr OTM and the new AB43 Mk248 Mod1 220 gr OTM available.