RE: 7mmstw v. 7mm ultrmag
You are going to love your new 7mm-STW.
My pet load is,
79-Grains IMR-7828,
Federal 215-magnum primers,
140-grain Nosler Partition bullet.
I have used other powders & bullets, all were accurate. I prefer the 140-grain bullet for all of my deer & antelope hunting.
I have used this same load with great results on elk. I prefer my 300-win mag loaded with 200-grain partitions for my "go-to" elk rifle.