The wife got herself a new 9mm ruger LCR and really likes it, but we are having a problem with bullets pulling loose from the cases. The fifth round in the cylinder will sometimes walk out of the case, locking the gun up. So far, we've tried federal and blazer 115 grain. Today, out of 25 rounds, 3 pulled loose. I know this can be a problem with revolvers chambered in pistol calibers as well as a problem with lightweight revolvers. Ruger recommends trying a lighter weight bullet, but then said that they usually test with 147 grainers. Anyone else have this problem and find a brand or specific type that stays together in this little cannon?