If you go with Winchester ammo
180 gr 7.62x54R is rated at 2,625 fps
180 gr .30-06 is rated at 2,700 fps
As Mitch says difference in barrel length is probably going to matter more. Heck even variation from lot to lot of ammo could be 50 FPS or more. Careful hand loading could probably increase velocity on both as well.
.30-06 has the advantage of being available in the Hornady Light Magnum line which ups the velocity a bit more.
"If your plan is for one year, plant rice.
If your plan is for ten years, plant trees.
If your plan is for one hundred years,
educate children." -- Confucius
Last edited by vafish; 05-13-2010 at 18:53..