A friend called and wanted to how the trip to the range went, answer was good except the 45 ACP, I explained to him the pistol liked new commercial ammo and nothing reloaded, he offered to load some and meet me at the range, arrangements were made but I told him his reloads would not work, sure enough his reloads worked in 4 45ACP, not in mine.
Back to the first day, I went home dug out a box of new unfired commercial ammo and measured every detail and compared the dimensions with my reloads, the only way I could duplicate factory dimensions was with a sizer die, I adjusted a RCBS carbide die in the press to 'partially full length size the case' or 'to partially full length crimp the case', I went back to the range and shot all of the ammo that was crimped in the sizer die without a problem and accuracy did not suffer,
Back to the range with his reloads, his reloads would not chamber, then it became something wrong with my pistol, I would not trade the accuracy for the fix? I returned home with his reloads, I crimped? the cases with the sizer die and went back to the range, his reloads after crimping went through the pistol like store bought ammo.
I took the test with this pistol and reloads crimped with a sizer die, while visiting with Dillon in AZ. I discussed this with them, (Dillon tested everything before they went to seating with one die and crimping on another, including dies by other manufactures, and they said other manufacturers made some good stuff) they informed me there is not much I can try 100 times that they have not done 10,000 times, it boiled down to, out there they are shooters, a case that does not feed reliably cuts down on shooting time, crimping with a sizer die worked, Lee crimp dies worked, after testing and experimenting they developed their crimp die and they claim it is better. Again, I use a 'lock out die' or 'powder die' in the 4 position tool head of the 550B, this leaves me to crimping the 45's with the sizer die after loading or crimping and seating on the same position.
Appearance: the sizer die removes the bulge in the case that makes it look like the case swallowed a bullet.
F. Guffey