You still have more then enough for moose with that rig.
The specs on my 340 shooting a 504 grain total weight with 21.6% FOC (if you buy into that) arrow gives me:
101 lbs of KE and 0.669 slug at the (barrel)
Still making 92 lbs of KE and 0.640 slug at 40 yards.
If you believe conventional wisdom 45-55 lbs of KE and about 0.40 Slug is "enough for moose" so my "super slow set-up" is running double the KE and over 50% above the minimum slug.
But as a vendor of firearms when someone asks "do I need a MAGNUM" to hunt whatever, my answer always is "Do you believe you do".
When you have that animal, particularly if it's a "somewhat rare hunt for you" (I only get to hunt moose every 3 or 4 years so it's kinda a big deal, takes two days of travel, much money invested etc) if a moose happens to step out and present a shot opportunity, I will worry about "many things" but my gun/ammo or bow/arrow/broadhead should not come into that equation.
I need to trust those things 1000% and focus on doing my part and not worrying if I'm "under-gunned or under-bow'd".
But then sometimes I tell the other story.
A guy does all his research and decides a nice 270 Win would be "more than enough" for some Deer Hunting and Moose Hunting in Ontario.
He walks into my shop but has an immediate urge to urinate so pops into the public washroom and pulls up to the stall beside one that is occupied.
Not curious at all he unintentionally glances to his left toward the occupied stall.
He finishes up, walks straight to the gun counter and asks to take a look at the flashy 300 Wby in the center case
