Pleasant surprises with my old .270 winnie

[Mr. Magoo]

Definitely more to the Sherman designs than higher velocity.
The shorter and fatter cases SS and Max cases are easier to tune and keep there, and in his words "the efficient ones usually are."

10-4.
I'll be reading a bunch more about it, trying to learn. That's part of the fun for me.

Right now I'm working on consistency in my ammo and practicing my shooting technique. It's been too long since I burned much powder and I'm rusty.