350lbs. would be a VERY small elk...calf or so...

mature bulls can be VERY large, and if you dont have horses on snow, your not getting it out full and intact...

key thing to be aware of, most states require you to keep proof of sex attached to the carcass...if you dont, they can/will take your animal...

So, this leaves you to one of essentiually two methods...debone or not debone...

and sometimes it is easier to not debone, just quarter it, and pull the backstraps and loins...Some states require you to take ALL usable meat whci in Alaska includes rib meat, and neck meat...

If it is warmer weather, I woudl HIGHLY recommend against using plastic bags for meat...Always carry game bags with you, as you might have to hang some meat if you are not going to get it out in one trip...and lots of 1/4" rope to hang teh meat high enough from bears...