I'm not trying to hi-jack this thread, but I've only used the 300gr. XTP in 44 caliber and have had zero issues. I use it in my muzzleloader to 1960 FPS and my 44 Mag at just over 1300 FPS. I'm in the process of putting together a 445 Super Mag and plan on trying the same bullet. Deer and hogs have been my main quarry and shots are under 150 yds. with 75/100 yds. being the norm. Mushrooms are textbook when I do find a bullet and have not had any separation issues that I am aware of. Not sure if the .430 diameter vs. .452 diameter has any bearing on it or if it is just an issue with the MAG TIP type itself, but I like the bullet!