In this case, with Africa on the agenda, a 7x57, which is the same as 275 Rigby adds the nostalgia and African/European connection. As well as the romance of all that combined into a functional work of art done up in fine Walnut and blued steel doesn't get any better. Go all out and order a custom fitted Rigby Highland Stalker, just be sure you love this woman more than you are going to love that rifle
My wife shoots an Encore in 7mm Rem Mag.
I load a 140gn Barnes TSX for the rifle and it has all of the knock down and range needed for everything she has hunted. (Pronghorn, warthog, white tail, springbok, etc.) A nice plus: The Encore is a simple break-action single shot with a short LOP. It fits her needs perfectly.
The weight of the rifle is a big deal in mitigating recoil, but as you know there is no free lunch.If she can handle and likes a 300 win mag, that would be the way to go....like Red Leg points out, it’s often the stock design that dictates felt recoil so might have her go with a R8 or Lady Helix.....I’m dialing in my Helix tomorrow so we’ll see how the recoil is....thing weighs next to nothing even with the scope mounted....wife was shouldering it tonight and really liked the weight...think the Lady Helix has a LOP about an 1” less which would be about perfect. If the recoil isn’t bad I might have her give mine a go.
The weight of the rifle is a big deal in mitigating recoil, but as you know there is no free lunch.
Heavy rifle, hard to carry all day but a pleasure to shoot and the opposite with a lighter one.
That's one of the reasons we are going with the R8 as there are different profile barrels in the same caliber to further customize.
You can pick your poison from a light weight mountian rifle to heavy DG calibers and everything in between.
My wife is looking at a 300WM that comes in around 8# to 8.5# with the scope mounted.
Let us know how she does at the range.
For what is worth I would recommend a T/C Encore you pick the caliber. I have three barrels for mine a .270 Win, 300 Win Mag & 35 Whelen. I have used all three rounds in Africa and I prefer the 35 Whelen by a wide margin.