You can generally get a sense the opinions that come from folks who've hunted mountain goats, and those who can envision it. There are no .45-70s or 9lb rifles on the list of a mountain goat hunter. If goat is your prime focus as stated, setup a rifle under 7lbs all up, preferably 6lbs, and in a speedy but reasonable to shoot chambering like .270. I hunt those pain vehicles many times a year and have to let many an exasperated sigh go when clients arrive with a 9lb scoped Magnum after the forewarning above.. They always see the light about day two of the hunt and the guys that repeat generally come back with a Kimber, Model 7, titanium something, or flat out custom that gets them into 7lbs and under scoped. If you only want to shoot one goat swell, if you want to mountain hunt annually, get a mountain rifle and be sure to make it stainless. Spend once cry once.