ORIGINAL: Roskoe
I didn't look at all these websites, but I'm sure they all have a common theme: try to send the bullets down a clean unfouled barrel for the first five or ten shots - so each bullet can pass over bare steel and burnish it slightly. The method I have used over the years is to use a heavy-for-caliber bullet - preferably a round nose to get maximum bearing surface. Clean the barrel every shot for the first ten shots. Make sure you start out with a really clean barrel.
By cleaning, I mean to push a couple wet patches through the barrel followed by ten brush strokes with a wet brush. Wet the initial patches and brass brush with Sweet's 7.62. Then start pushing through patches wet with Shooter's Choice until they come out clean - hopefully no more than four or five. Then a couple of dry patches. Fire another round. Repeat.
After the first ten, then clean every five shots for the next thirty. Then just shoot it as normal.
Not necessarily. Read what the guy's from Sniper Central reccomend. I followed their procedure as they know what they are talking about. I've been a member over there for quite some time. I had amazing results. It could just be the gun but it worked fantastic.