*After searching numerous forums and web-sites and coming up empty I decided to join this forum. (Converted troller) My apologies if this issue is listed elsewhere or needs to be posted elsewhere.*
I am having a problem with my new JM pro. During a three gun match I shot 73 rounds of shotgun shells. 60 of these shells were #7.5 birdshot, 10 were #9 bs and 3 were slugs (winchester, 2 3/4, 1oz 1600fps). All of the rounds fired and cycled correctly with the exception of the 3 slugs. When firing the slugs, the shotgun locked up with the bolt in the open position. Pushing the bolt release button cycled the bolt forward and then I had to manualy load the next round. After the third slug I manually chambered in the #9 birdshot and finished the stage with no problems. Before I shot the shotgun I thouroughly cleaned and prepped the gun as prescribed by JM's and other youtube videos. If anyone has a solution I surely would appreciate it. Thanks.