I bought 1000 rds of 185gr SWC's and I cant get them to function in my 1911. These are the copper plated variety. My lead 200gr SWC's function well after tuning but we can't get these copper plated rascals to feed. After I rack the slide and the thing jams, I pull the round and find that the bullet has reset in the case about one sixteenth of an inch. These bullets are really slippery. Also, they are much shorter than the lead SWC's. Anyone else having this problem?