How to remove Type 99 and 38 barrels

[1mark]

A friend asked me to help remove barrels from some Type 99 and 38 receivers he has. I have a barrel vise and action wrench. Now I have removed 03, Garand and Mauser barrels and installed them. But the Japanese barrels would not budge.
What is the secret to getting these off?

[Guamsst]

Apply more elbow grease..... Ok, seriously, I can't wait for a real answer. I have a small stack of these to do.

[Devil Dog]

If you have the correct wrench, vice and torque and it still won't budge.... Remove the rear sight, chuck the barrel in a lathe and make a "relief" cut in the barrel at the receiver joint.
Cut close to the receiver but do not touch it.