I have a LH post 64 in 7mm STW. While I find the rifle great for open country mule deer and antelope I spend more time in the woods and on a horse where this outfit is not very handy in my opinion. So, I am looking at a new barrel and my thoughts are 300 HH, 338 WM, 358 Norma. I like large calibers and I have an itch for an HH. I would like to keep the barrel at 22 inches. What are your thoughts?

My other rifles are a 375 and a 450 marlin and lots of little ones. No middle of the road rifles. My rifles are used primarily for elk and bear. I would like to add another smaller caliber rifle as well down the road but there are more options for those in LH configurations hence leaning on converting this one to a .30 + caliber. Suggestions?
thanks