Current favorite is a Winchester/USRA 70 stainless Ultimate Shadow in 25 WSSM.

The Rifle:

Barreled Action = factory specs stainless Winchester/USRA 70, 22" barrel.
Bottom Metal = factory specs alloy Winchester/USRA 70.
Stock = McM Compact.
Mounts = Warne 2-piece bases and rings.
Sights = Leupold VX2 2-7x33 matte finish with standard Duplex.

The Load:

Case = Federal 243 WSSM brass reformed to 25 WSSM.
Primer = CCI BR2.
Powder = H4895.
Bullet = Nosler 100 grain Partition.

Not everybody's cup of tea, but it works extremely well for me!

Current #2 is a Remington 600 in 257 Roberts.

The Rifle:

Action = factory specs Remington 600.
Bottom Metal = CVMW alloy unit.
Barrel = recycled factory specs Remington 700 BDL 22"
Stock = McM, apparently an older, discontinued, style that I bought here on 24HCF.
Mounts = Weaver 1-piece base with Warne rings.
Sights = Redfield Evolution 3-9x40 matte finish with standard Duplex.

The Load:

Case = Winchester/Olin.
Primer = CCI BR2.
Powder = H4895.
Bullet = Nosler 100 grain Partition.

The Roberts is about 250 fps slower than the WSSM, but it does its work at significantly lower pressures and the difference in performance between 3000 and 3250 fps within a couple hundred yards is probably not meaningful in most cases.

Jeff