Originally Posted by goettsch
Is the gain worth the pain?
If you just want more velocity,it would be more cost-effective to buy a new .300 WSM or a .300 Win Magnum.
Depending on the action used,rechambering to the 30/06 Improved or Ackley or Gibbs usually requires that the feed lips be modified.
Most of the blown-out 30/06 wildcats were invented and popular back in the '40's and '50's,when the only high velocity 30 caliber was the .300 H&H.Some people wanted more soup without the belted case and high cost of factory ammo.
Some gunsmiths made a good living doing this back when the DCM unloaded a bunch of Springfields and Enfields for $14 - $22,in the late '50's.
We used to call these,the "poor boy magnums".
Most 30/06 factory loads are "loaded down" due to the existence of some "weak" rifles chambered for that caliber.
If you have a quality rifle in the 30/06 and handload it to the pressures that these wildcats are usually loaded to,the difference may be 50-100 FPS,maximum. This was Bob Hagel's position and he tested and chronographed all of these wildcats.
I have a .30 Gibbs so I know where of I speak.
It works for me,but I handload.The next owner will also have to handload.