Bullet problem

Magnus bullets was nice enought to send me some of their 185gr Button nose wadcutters #801's .......I loaded these as many here have reccommended with clays @ 3.4( would have been 3.5 but my powder dump use's disk's and 3.4 was it) Bullets seemed to be accurate but they would actually lock the gun up.....this didnt happen with the 205gr long nose wad's.....What is going on with these? and what can I do to stop it? I would like to give these bullets a fair chance ..But I really dont like takeing the gun apart with a hot rd in the chamber.....I will be changeing out the 16lb recoil spring with a 14lb as well as a reduced pwr main to let the gun cycle better with light loads.....I think maybe the stock springs may be some of this....as the gun sometimes wouldnt fully cycle....either didnt eject at all or would stove.....never had a gun lock up like this before but it didnt do it with the normal profile wads.........

Use more powder. Lighter bullets need more powder to achieve the same velocity as a heavier bullet. If you're using the same powder charge, you're getting less internal pressure, which yields less imparted momentum.

Stovepiping or a slide not cycling the next round in mag typically means not enough powder and/or too heavy of a spring. (not enough "bang" to push the slide back all the way)

Go to 3.8 or 3.9 of clays. And just like the Ronco Grill infomercial used to repeat, "Set it and forget it!"

You might also consider checking the size of the bullets and making sure they were properly sized. I used to buy un-sized bullets from Terry and size and lube them myself. And make sure your crimp is right. You want it at .469"-.470" for proper crimp.

And yes, I would personally use 3.8 to 3.9 grains as suggested by Jakuda. Lighter is not necessarily better...Contrary to what many seem to believe.

Best Regards,

feeding issues often is because your crimp is not tight enough, .469 will fix that.

Joe,
May I ask what kind of bullet sizer do you use?
Thanks!
JLK