I agree with Roskoe, the 30-06 usually has a 22" barrel, a .300 Win Mag needs a 24" barrel to thrive.

If you want 300 win. Mag Vel. just buy Hornday Light mag. it matches the 300 Win. mag. Vel.

I know every gun is different; but, so far, the Hornady Light Magnum ammunition has not been able to deliver its advertised velocity. Itclocks about 50 fps faster than thefastest 30/06 handloads I have been able to safely produce. But not over 2900. I can generally get 3,000 from a 30/06 Ackley Improved; and 3,100 or morefrom a .300 Win Mag. And accuracy, at least for me, has not been very good with the 30/06 Light Mag ammo.

No it doesn't, its about 100 fps or more slower.

The Hornady light mag ammo is very overrated, I have never seen it come anywhere close to listed velocites, its always close to the standard velocity for a given loading though.

What real is the advantage of the increased Vel. between 30-06 and 300win,.. when hunting.... White tail or black bear ... so far my 6.5X55 has served me well.

No trouble rechambering it at all. But you need to alter the bolt face for the magnum head size, and open the action rails so it will let the maggies feed from the magazine......

There is no need to open up the action rails on a Remington 700 long action when going from a 30/06 to a .300 Winchester. I do recommend a magnum follower. Now the .300 RUM and 7 RUM . . . . . they need the rails opened up as well as anultra magmagazine box and follower.