Reloading Question

So I recently got an old Herters single stage press and decided to load some rounds for my .40S&W. My first loads were 150gr Nosler hollow point bullets with 5.7grains of Accurate No. 5 powder. When i went to buy more bullets all i could find were Berry's plated bullets. I loaded them the same way as i did the Noslers with 5.7 grains of No. 5 powder, but didnt crimp the bullet as hard because I had heard that it will make the copper plating separate. So anyways i went out the other day and shot a few rounds to test for accuracy and such. The rounds loaded with the Nosler bullets performed very well and were dead on accurate. The rounds loaded with Berry's bullets were more accurate than the factory loads yet about every other round either jammed or failed to fully eject. I thought i messed up my gun somehow but couldn't find anything wrong. I put a dozen more rounds loaded with the Noslers down range and had no problem at all. Tried the Berry's again and same thing again, every other round jammed or failed to eject fully. Has anyone else on here loaded with Berry's bullets? Am I doing something wrong? I looked at their website before loading and they said to load them light. Am I going too light? Seems like the Nosler bullets of the same weight would perform the same way, but i guess I just am not understanding all of the physics behind it.