The second time I used my Sig p250 .45 at the range the slide would stick back as if the clip was empty. But when I took the clip out to reload there would be 1 or 2 rounds still left in it. This happened 4 times I believe. I asked one guy at the range and he told me it might just need to be worn in more as I have only put 150 rounds through it. He also said it could be clip compaction from having it loaded all the time. The gun only came with one clip. Is it proper to switch out clips and give the magazine spring some time to rest without bullets in them?