My sister used a Winchester M88 for her moose. She lives in Alaska and her and her husband kill a lot of moose.
I load 180 grain Nosler partitions for her. She tells me that she has never had one get away. Moose are often "low-strung" and after a shot they don't always fall fast, but within 10-15 second they are on the ground and all done. I don't know how many she's actually killed but she moved up there in 1989 so it's quite a few.
A few were shot with a 338 but she's tall and thin and the 338 is more gun then she likes. At least 2 were killed with her husbands 30-06 Mauser. All the rest were killed with he M88
Last year my Nephew told me to please load another box (case guard 50) of the Noslers because "Mom's almost out of them" and a box of 30-06 also (I load them with Nosler Partitions in 200 grain weight) He is coming through here in the next few months and said he's pick them up.