Got a WH '28 awhile back for a decent price. KW commemorative version... lightly used so removed the "bling" and it looks GI now.
However it always had some fail to fire issues... tried different mags and many fail to feed/fire issues however drums ran 100% because it fed directly into the chamber.
Step two..got a GM barrel.
Step three... Remove WH barrel....good lord they used three gallons on loctite on that thing.
Installed new GM barrel with NO loctite. Reassembled...
Grabbed a magazine I knew that had feed issues.
Brrrp.. dumped the mag. Tried again...no issues.
Need to shoot it some more but I think the GM barrel has fixed my issue.
Also of note... prior to this the gun was properly greased and oiled and ran about 775rpm.
New GM barrel and running it dry I hit 870rpm!
It has a Wolff recoil spring in it as well.
Added pics of the WH barrel next to a USGI barrel. You can see a shelf/corner/angle whatever that was causing my problems. I have ammo with a sharp crease in the brass from that on the rounds that didn't fully seat/fire.
WH barrel on right. Note sharp corner.