Good question, have been wanting a shorter barrel on my 460 but can't find out if it is doable.
Yes is doable on your 460 S&W Magnum.
Special tools are required to perform the task properly. They are factory only or custom fabricated.
The biggest issue for attempting this is preventing/holding the barrel in place when tightening the "barrel nut" for all the models 10.5" and shorter (exception are the 2 standard models SKU 163460 and 16465).
As the barrel threads are threaded the same direction on each end, meaning the direction for tightening the barrel nut will loosen the frame to barrel connection; hence the need to hold the barrel when torquing the barrel nut.
I should note here that the barrel nut is integral with the muzzle brake on most models.
The tool is inserted into the barrel must match the lands and groves , since a progressive twist is used, each barrel length need a different tool.
Only one model of the 460 has a nut with spanner type nut.
The ES models use a insert to engage the nut similar to torx.
The above mentioned SKU 163460 and 16465 require a slightly different challenge as the barrel is thread only on the frame connecting end. It has a flange on the other and the barrel is actually tightened as an assembly. This system requires a crush washer be placed under the flange to to adjust the the BC gap.
In some past thread I have provide pictures of the pieces required.
For most is an easier exercise just to buy the length you want to start with.
