Hi everyone.
I’m down to only owning one hunting rifle to do it all for the foreseeable future.
My rifle is a small ring 7x57 it shoots 160gr bullets into a half inch all day long.

I do hunt mule deer and elk on the prairie quite often where shots can be as far as 400m.
270 country in other words.

For those occasions I’d like to develop a load using 140gr bullets,the old 160gr load at 2550fps may just not be quite as flat shooting as a 140gr load at 2800FPS.

My rifle never shot 150grain bullets well so I doubt that it’s going to shoot 140gr bullets any better.

My question is this:
Are there any tricks to getting a rifle with a twist/long throat that shoots heavy bullets to shoot lighter weight bullets?

Would a 140gr tsx for example shoot well given that the bullet shank is quite long for its weight?

Thanks