I own a Savage 111 300winmag. It came stock with a 24" sporter style barrel. I'm looking at replacing it with a 28-30" heavy or bull barrel. I don't care about weight. I want a thick, long barrel. The question is this... can a barrel be installed by yourself? or does it HAVE to be done by a smith? Also, are there any particular advantages to the 5R rifling? A friend of mine has it on his Rem700 and loves it. I'm not looking for a million dollar barrel, but something better than factory. Any suggestions? or anyone selling by chance???