I’d go with the 375, excellent elk/moose gun, the 7 mag is cute and all but.... I’ve shot quite a few elk with a 7RM, it is a good cartridge but I haven’t picked one up in years since I bought my first 338WM. I prefer a heavier bullet than what is available in the .284. Where I hunt elk you can expect a shot anywhere from 25 yards to 300 yards and I wouldn’t feel slighted with a 375 at all. Get to the range a bit more and get that comfort level up out at 2 and 3 hundred, you will be surprised. Bring the 7 along for a backup and for squirrels and such.lol