The buffalo bore bullets might be seated too far out in the casing for your Ruger LCP. I bought a LCP in June and it had one of the short throat barrels. Would not chamber Corbon hollowpoints at all, the slide would not close. Ruger sent a new barrel and I returned the original. I think any LCP made after the middle of July has the newer style deeper throat barrel from what I have read. I shoot cast lead bullets in mine from a RCBS 90 grain roundnose bullet mould, similar in shape to the roundnose factory loads. No problem with these and no leading in the bore or chamber.