Slide may not be traveling far enough to the rear or the follower is not popping up fast enough in relation to the slide's forward travel.  Try adjusting the loading to see if it makes a difference.

eph411
Cajun Gun Works did a Pro-Package upgrade prior to shipping gun to me.  They installed the 14# as their recommended recoil spring for their upgrade.

Shadow...I don't follow.  Sorry.  If you are talking about loading of the cartridges into the mag...one at a time (lol) and then tap on the bench to seat them all toward the mag "rear".  If by load you are talking about the cartridge build, as in powder charge, crimp, primer choice, OAL, bullet choice....well, I would like a more in depth reply.  Thanks.

Well, I double checked to make sure I wasn't crazy and verified that the factory standard on the Compacts is a 17# spring. So the 14# might just be too light a spring so that the slide is cycling too quickly for the magazines to catch the slide on the last shot. It's common to have the other problem as well where the loads are too light for the heavier recoil spring so that the slide doesn't cycle fully and lock back, but it's hard to imagine that would be your problem with mid-range loads and a lighter weight spring. So like someone already said, I'd start by ruling out anything that's magazine specific, but if it isn't that I'd try swapping back to the factory spring to see if that makes a difference. Do you know if they changed out your hammer spring at the same time as the did the recoil spring, like if they moved to a lighter weight recoil spring and a heavier hammer spring as is common a lot of times on the 1911? Just wondering if there's anything else they might have changed that may be causing your slide lock woes.

Eric

Quote from: The_Shadow on January 30 2015 06:55:33 PM MST
E3 being a Shotgun performance listed powder it might have some uses in metallic cartridges but you would be working blindly!

Best regards!

Well, so were Red Dot And Blue Dot and Green Dot..........they have many pistol recipes.

Quote from: gandog56 on April 10 2015 04:41:32 PM MDT

Quote from: The_Shadow on January 30 2015 06:55:33 PM MST
E3 being a Shotgun performance listed powder it might have some uses in metallic cartridges but you would be working blindly!

Best regards!

Well, so were Red Dot And Blue Dot and Green Dot..........they have many pistol recipes.

Yes there are very good published loads with the Red Dot, Blue Dot and Green Dot powders in both shotshells and metallic pistol cartridges. However in the original 1st post amada8 stated in his list that he had E3 powder to work with, well I have not seen any load data using E3 in pistol cartridges, thus the reason behind my statement..."you would be working blindly!"

Finding safe starting points, where none exist for E3 in any metallic cartridge would be a blind guess!