I just picked up a new .300 RUM Sendero II to build a .338 Edge with. 1st Reason? I got it cheap. 2nd reason is Because most everything is ready to go already. Bolt face correct and already using the .300 RUM case. My plan is to have the action face, bolt, lugs all checked for square and square up what is necessary. Add a thicker recoil lug. Install a SS fluted barrel that will finish to 30"s and add a Holland break. Gunsmith says this will work EXCEPT. My plan was to use the H.S. Precision stock with the original aluminum bedding block and all would be well. Gunsmith say's it won't work with a 30" barrel and a 2" Muzzle break as it is too heavy for the stock. He also said you cannot do this as the action on the Sendero will flex in the area of the magazine and the gun will not shoot worth a hoot. He further says that I will need to have a block soldered into the mag well of the action to prevent this or put an aluminum block under the barrel to support it right ahead of the recoil lug. I had intended to have a Wyatt's extended magazine put on the gun. He is a really good gunsmith and I usually do not question him on what he says but it looks to me like the price on the build is going to go up a bunch by doing this and I was planning on keeping the price down as much as I could by going this route. Is there a way of doing this that I can keep the original extended mag idea or should I just go with his idea of soldering in a block and making it a single shot. And as far as the barrel what is a good method of supporting the barrel with it being a basically 32" length including the MB. Right now it does not make me any difference if its a single shot as this is not going to be a rapid fire rifle and I shoot a couple other guns of mine that way now and am use to it. What are you other gunsmiths running into as far as problems with a build like this. Don't want to mess it up and I want an accurate long range rifle when I'm finished.