Depending on barrel taper, it could be possible to cut 2.6" off of the breech, and rechamber to 30-06.
I know long range high power competitors, will cut off enough to remove the flame shot portion, the lands, and rechamber 1" shorter. Of course they are rechambering from the original reamer, so the chamber diameter is the same. Also the target barrels that they use are 28-30".
I don't know if this is practical in a shorter barrel, I have never heard of this being done. It just seems like it would be possible if not practical.