Re: Sendero or XCR
There are 3 major differences between the rifles: corrosion resistance, weight, and accuracy.
The XCR is more rustproof than any firearm that came before it. The Browning Stainless-Stalker may have invented corrosion resistant rifles but the XCR perfected it.
The next issue is weight. For some light weight is all that matters. For others a little extra weight is welcome if it comes with being more shootable. I know I wouldn't object to carrying a Sendero on a mountain elk/muley hunt while others believe they MUST have a rifle under 6 pounds if they are to walk more than a mile. In .300 RUM, the added weight of the Sendero will tame a lot of the recoil. Most hunters would need a brake on an XCR in .300 RUM.
Then there is accuracy. I've never heard of a Sendero that wasn't a shooter (even if most don't start out as a target rifle). I've seen & had an XCR that wouldn't group no matter what we did to it.
For walking through the timber the XCR will be faster & easier to carry — so long as you don't develop a flinch due to the recoil generated by a .300 RUM in that light of a rifle. The accuracy trade-off with the XCR won't matter inside of 400 yards. If you are shooting past 400 yards, the added inherent accuracy of the Sendero matters. At 600 yards or more, the accuracy differential really matters. If you luck into an XCR that is a tack driver, great, because otherwise they are terrific rifles. Just don't EXPECT an XCR to be as accurate as a Sendero.
For someone in their late 20s who's in great shape, the added weight of the Sendero is nothing compared to the benefit in reduced recoil and accuracy. Go with the Sendero.