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Make sure the expander is too big before you turn it down!

I'd start by zero'ing my calipers and then measuring a few bullets and the expander (in multiple locations. Re-asses from that point... that should clear up a few things and give a good direction of where to look next.

MaduroBU wrote: ↑Thu Dec 10, 2020 10:19 am I get the issue with the magazine in my hand and the gun nowhere to be found

Can you elaborate on that statement? Do you mean you get a dive if you "thumb" rounds out?

I just re-read your post- you have 2 very different issues going on. #1 feed issue see above.

#2 you have a loading issue or 2, independent of the feed issue.

You either have a neck tension issue, or an undersized bullet (which has been common with Hornady bullets over the last 2 years) not a crimp issue. Have you checked diameter of them? They should be .355 and some change. (like .3555 if you use a mic vs caliper)You shouldn't need to crimp any more than it takes to remove the flare. Crimp itself is only a set back preventative to the extent that the case walls dig into the bullet- which only helps one way (as you've figured out)

Have you considered an EGW U-die? Made by lee but the EGW specs. A couple thousandths undersized for this kind of issue. (and for $25 it's a cheap fix most of the time)

Now if you are overflaring or your expander plug is a touch large that could cause low neck tension as well. If plug is too large- you can turn it down a hair...or replace.

strogg wrote: ↑Wed Dec 09, 2020 9:51 am What's the OAL of your rounds?

My first question as well. Too short can also nosedive. And HAP's are a pretty short bullet. I'm not too sure you could load 115 HAP's too long and have them stay steady in the brass.

Doing this with multiple mags of different make sort of rules out mags.

2nd question- Have you run a box of factory ammo recently to confirm it's just your loads?

3rd question- Is the recoil spring of proper weight? An improper recoil spring can bump a round out ahead of the extractor and let it dive.