Most of the guys I hang with would return to camp and tell about the 400" bull they just saw! JK
A ton of guys on here know more that me but it looks similar to the one my son shot 2 yrs ago. Scored 348"
Ya, that will be my guess, 348".
Put him on the ground, tape him and post the results. That's the only way to know for sure.
Good luck to you!
Zeke