Well the dies are working fine since you folks were kind enough to provide what Hornady did not ....... instructions.
I gas checked and lubed the Lee bullets in a .451 die (the only SAECO I have for 45 ACP family bullets).
As cast the bottom band is .453-4, the upper .451-2
I seated them well out to bite the lands and they fed and functioned perfectly. (sorta)
I started with a double bull 28 x 14" target @ 50 yards. Nothing.
When in doubt, move into 50' and shot the remain 10 rounds. Load was 29 gr Lil Gun WW SR primers.
To say the group was bad is being kind. 8 of 10 keyholed (one is out of the photo). Would be a deadly rig for a bar fight !
Pulled down the gun and there was only one teeny tiny trace of leading. One dry patch, it was gone.
I noted an earlier poster said he sized to .453. I am going to try some with the GC affixed in the SAECO only and the bullets pan lubed. IME, with many decades of casting, keyholing is either due to undersized bullets or a twist/bullet incompatibility. I'm betting on size as cast bullets usually work best 2 thou over their jacketed counterparts.
I also ordered some real .452-4 crimp on gas checks off Ebay, so the Hornady .458 ones falling off won't be a possible issue.
Cheap shooting demands more effort .... for sure.