Winchester made some barrels for Highwalls in both .218 Bee and .219 Zipper.  Before the second World War you could send a Highwall in and have a round barrel installed.

My Highwall .219 Zipper is a none factory barrelled heavy barrel built during the 50's.  It shoots 55 grain V-Max bullets at 3200 fps into less then 3/4 inch all day.

Det

I had a Zipper barrel for my CPA, using C&F's forming dies it's hardly any work at all to make them out of 30/30 Take the time it takes  you to re-size a case to re-load. Forming is about twice the time and you only have to do it once.  You have to do right much to a new lot of brass anway and forming down from 30 to 22 is just another step. Not to mention you are forever out of the clutches of brass shortages given how many 30/30's there are out there

I liked the caliber, it's as capable as a .222 Remington but if I did it again I think I would chamber for the Donaldson Wasp. It's just a straight sided Zipper.  From using the K Hornet and having used the regular Hornet there are some big advantages to straight sides for single shots that don't need to worry about magazine feeding. Straight sides only need neck sizing and not much trimming,  they don't grow like strong taper cases do.  You should be able to push the Donaldson Wasp a bit more than a Zipper, to .223 levels without any problem.

However if I was setting up a pair of Highwalls one with the excellent .30 US cartridge and considering it's ability to handle heavy bullets, would set the 2nd gun up on the same case and probably a 25 caliber wildcat with twist to suit a varmint bullet and/or long range thin skin game bullet.

For the light caliber varmint gun would go to a low wall and the K Hornet

My opinion only

Boats

It's very easy to form the .219 Zipper from .25-35 brass.  Basically, just run it into the .219 die, trim a bit and go to town.  Unless you specify a tight-necked chamber, you shouldn't even have to turn the neck.

The .225 Winchester is essentially a .219 Improved Zipper with the rim turned to allow it to fit a .30-06 family bolt face.  It will do within 100-150 fps of a .22-250 with equal bullet weights.  I have a Martini Cadet chambered for the .225 and I hold it down to .222 velocities because of the thin barrel walls in the thread area, but it's still a very accurate cartridge.

If you are really seeking .222 velocities, take a look at the .222 Rimmed, which was developed expressly to provide a cartridge for Cadet actions.  Not original to the high wall action, but an excellent performer.  You could also consider a .218 Mashburn Bee, which would have been a popular wildcat cartridge for custom varmint rifles based on high wall actions.

Just some thoughts.

I talked to Sierra today and they advised that a 1/9 twist would be good for their 65 grain .224 spitzers and McGowan says it will be no problem  to make that barrel in a Zipper.  I'm shipping the actions off just as soon as I can take good pictures of the engraving.   

Thanks for all the help!

(You need to Login or Register to view media files and links)

Here are the actions in the white.  Originally I was going to have them engraved identically. But after I had the first one done with the engraving in the center of the action side, I had the engraver duplicate everything else on the first action except the diamond of engraving in the center.  The more sparsely engraved action will be the .30-40 and the other the Zipper. (You need to Login or Register to view media files and links)

Beautiful rifles! May I ask who did the engraving?

Frank

Very nice. 
Have also had problems with McGowen in the past. Sold me a barrel marked 14" (1-in-14 twist) when it was actually a 1-in-16". They made me whole, but was a waste of six months