I have a problem with my reloads that are 40 cal, about 2 out of 100 will expand after firing so much, that they stick in the chamber, resulting in a double feed. The gun is a ruger sr40c. I have ran 150 factory loads threw it with no problems. I use 7.3gr. of longshot with 165 gr copper plated bullet seated at the standard length. this is very frustrating because I have been reloading for over 30 years and never had a problem like this before. Any input will be greatly appreciated.