Some help please on choosing which action to use.

We are building a .275 Rigby looking/styled 7x57 rifle for my wife. Long throated to shoot 175gn bullets in the 2600 to 2700 fps range. This will be her PG rifle.Actually probably her everything rifle!

I was planning on using the 1909 Argentine action. But the more I think about it, I have a very clean Small ring 1910 Mexican. It would weigh about the same but would look very trim, the barrel shank could be a bit smaller that would save some weight.It will have a slender 25" LW barrel.

So, 2 questions:
1. Will the 3.118 Mexican box be long enough to fit long COL 175gn loads to get the desired velocity?
2. Which would build up to look more like a .275 Rigby a Small Ring 1910 Mexican or the Large Ring 1909 Argentine?

Of course the barrel will be stamped .275 Rigby!

Allen