Here are a few results of barrel break in and bullet testing on the 338 Snipe-Tac. I was testing the Boron coated 300MK bullets, the pressure was lower and speed dropped 50fps on average. The barrel cleaned very easy and almost no copper fouling. I tested a 30" and 33" barrel, there was about 60fps differance between the two rifles.
I put up a rather large steel plate, about 150#, at 500yds.
There was several guys along with me, one to break the barrel in on his 308win, and others just watching. The steel is supose to be AR plate, we fire several sighters at it with the 308win, ding, ding, ding. Made real nice silver marks so you could see it in the scope. I put the crosshairs of my Snipe-Tac, across the top as it is sighted in dead on at 100yds. Boom, no noise, i looked through the scope and could see a small mark upper center of the plate. I figured it would make a loud noise, but i could see the dent. I fired another, same thing. I let the other guys take shots as well, they all used different sight pictures, and they were shaking tring to pull the trigger [img]/ubbthreads/images/graemlins/blush.gif[/img], it was funny watching them. After the watching, we figured the bullets were exploding on contact, um NO...i saw the hill behind the target, dust kicking up, at about 1000yds. We drove out to the target...here is what we found.
The splashes are from the 308win.
Those holes were about 3/4" in dia, looks like a plasma torch cut them. The 308 didnt mark the steel. These are the two shots i fired, measured 2.5" It was very windy and drift was very minimal.
Back side of plate.
I tested several loads, H-BMG50 and WC872, both worked very well, speeds 3200-3325
One young man got a chance to fire my rifle, he is leaving for Iraq in several weeks, he took his target with him to show his friends, the biggest rifle he has ever shot was the 223. It was a very good day, all had fun. 500yds is just to close for the large 338-408 wildcats.