I’m going to give you a little different take on the R8 than the previous esteemed posters. Mine has yet to see Africa or much hunting… YET. for me, the RB was a dream rifle. The highest end rifle I’ll own. I have five barrels ranging from ..257 Wby to .375 Wby. As far as game: only three coyotes and a ground hog. Not an auspicious beginning. However, in the four or so years I’ve owned mine, I’ve sent well over a 1000 rounds down range.
Accuracy: Rare to shoot a 100yd group over an inch and if I do, it is usually my fault.
Ease of changing barrels: If you can use an Allen wrench, no problem.
Scope mount: Easy to attach and detach. No noticeable change in point of impact. I have a designated scope and mount for each barrel. One caveat here is that if you switch one mounted scope to other barrels, you’ll probably have to adjust the mount’s tension to fit the other barrel.
“Safety”: As I’m sure you’re aware, it is really a cocker and not a safety. I’ve found it takes a little extra thumb pressure than you’d be used to, to cock it. Decocking, for me, took a little getting used to.
Feeding: flawless
Ejection: flawless
Changing the bolt head: If you have a barrel for a standard round like a .308 and another barrel for a magnum barrel (.375 H&H), you’ll need to purchase and change the bolt head. This is simple: lift a little clip, rotate the bolt head and remove. IMO, this clip looks a little fragile to me. I purchased another bolt and just have to use the appropriate bolt / bolt head combo.
Trigger: Approximately 2# and extremely crisp.
Downsides: When you work the bolt, you do need to slam it forward, otherwise, you will just hear a click. The other is price. As I stated, this was my dream rifle as it was out of my normal price range and took some saving, but I don’t regret the purchase in the least.