I generaly polish the barrle with some fine sand paper, and a wire wheel, and clean everything really good. then apply cutting oil to everything. Then line verything up, and drop it onto a big lead block (about 40 pounds worth) I ahve the muzzle break on real tight too, so as to protect the barrle, just in case I miss the lead block. the momentum of the trunion/receiver is generaly enough. as the barrle gets about 1/8" to 1/4" inside, I make sure it is perfectly alligned, and continue to beat the muzzsle on the lead block (if it isn't alligned, you can vise the barrel, and used a padded crescent wrench to turn the receriver/trunion). I hold it by the receiver with both hands, and quickly thrust down onto the lead block as hard and fast as you can. it works very good, and it cannot damage the reciever this way. I had a couple that were VERY tight, and couldn't move all the way, (I think I didn't polish these) so I ended up gettting a long peice of 1/8" X 1" flat stock, and put it ont he trunnion(just behind where the pin goes through, and beat it with a hammer, (with the muzzle resting on the lead block) I used a 3# hammer, this worked on the worst stuck barrles ever seen.