ok so hey everyone. im new to the site. i live in the tri city. so i bought a s&w sigma .40 and iv been shooting it last couple of days. first two days the gun did great no problems. shot about 150 bullets, but today i went out with some friends shooting and the gun jammed almost ever 4 shoots, sometimes like 3 times in a row. gun has been clean every time. maybe i missed something. i did use differnent bullets this time. so maybe thats y. first two times i used .40 s&w winchester, now i used .40 S&W RWS. 250 Rds. Rws .40 S&W 180 - Gr. Fmj Ammo - 610693, .40 S & W at Sportsman's Guide any help would be great. thanks.