OK, I was looking in my reloading manual and I see that the 338 Win Mag is reloaded to the 52k-53k CUP range and my 270 is at 51k CUP. I realize that the bullet face is larger but how dangerous is this really?? I know a guy who custom made a handi in 300 wsm and those loads come from the factory at over 60k psi and has plans to make a 300 ultra mag, 338 ultra mag and such. He's fired approx 20-30 rounds through his 18.5" 300 wsm with no problems (yet). Any thoughts??
Here are his words: " THE SHOTGUN BARRELS ARE DONERS. I CUT THE LUGS OFF THE BOTTOM, MACHINE THEM FOR AN EXTRACTOR DETENT, AND WELD THEM ON A BARREL BLANK THAT HAS BEEN TURNED TO 1.120" THEN I ADD A 450 MARLIN EXTRACTOR WHICH FITS THE SAME CASE AS ALL THE ULTRA MAG CASES. YES MINE ARE TRUE BULL BARRELS THE SAME DIAMETER ALL THE WAY TO THE MUZZEL. THEN I ADD A FORTH SCREW TO THE SCOPE RAIL. THIS MAKES THEM VERY ACCURATE. MY 300WSM IS ONLY 18 IN. LONG AND STILL SHOOTS A 165 GR. BULLET AT 2800 FPS. I AM CURRENTLY WORKING ON A 300 ULTRA MAG., 338 ULTRA MAG., 357 HERRETT, AND A 22 K-HORNET"
sorry for the all caps...