Originally Posted by peashooter
Are you shooting the heavy for caliber SMK? I have found the lighter SMK pencil often while the heavies are consistent on opening.
It is true, with any bullet, that smaller diameters open with more difficulty but my testing has been mostly with .308's and some 6.5's. The 190-220 smk's need 2400'-2500' to open in my tests, and don't always even at that velocity. When they don't open, they almost always cause a banana bullet which tumbles nearly every time and can cause damage that may look like a mushroomed bullet exit wound...........Rich