It's been wet. Corrosion at work here.
Strongly suggest you invest in a carbide primer pocket uniforming tool. Primer pocket depth can vary considerably in depth and flatness.
Not seeing lube grooves. Are you paper patching?
Hold the inverted casing against the threaded rod in the tumbler that holds lid on. Tumbler running, of course.
This die does not appear to have a carbide resizing insert. Lube cases well and try again. I would recommend a traditional lube/pad method.
If memory serves me, this load was developed at Lake City with SMK 175ge and RL 15. Back in the day when Alliant had the contract.
Redding #1 for quality. No debate.
Try a lighter bullet.
Used many boxes of IPCO grease wads years ago. These had colloidal graphite mixed in. No leading, but kinda made for greasy smudged up gun.
Unique or BE 86, whichever will be more consistent in your powder measure.
Depending on age, it could have had a mercuric primer. If so, its not worth the effort.
Hard shot could have 6-8 percent antimony. Also arsenic. Smelt it outside and add a bit of tin. Bullets will be hard.
That would be your best choice.
Looks like a reload with moly coated Hornady A Mac. Mexican match maybe
Thinking the round nose will be easier to work with as far as feeding thru multiple guns
Sounds like beam is binding, maybe front to back.
Not at all. Mfg is promoting their newer pistol specific powders. Try Alliant 2004 tor pistol data. Info's out there, but you'll need to do some...
Dewey coated and appropriate bore guide if cleaning from muzzle.
Slug your barrel first. 9mm's can run .355 to .358. Tumbling can often be cured by increasing bullet dia. 9mm's can have so many variables in...
I believe the Redding carbide expanders are for rifle cartridges. Their pistol expander is titanium coated.
Separate names with a comma.