I have been told by quite a few guys that you can successfully fire form with a small charge of Blue Dot pistol powder and a wad of cotton in place of the bullet.
The idea being that the extremely fast powder will blow the shoulder forward and you wont burn up your barrel prematurely by fire forming rounds out the business end of your rifle.
I will go out to my shop and try it right now and let you know what I come up with.
Ok, It worked well with 20 grains of blue dot. I think that I would go up 5 more grains though. Just to make sure the sholders form sharply.