DD thanks for the reply. I had not thought of the 224 Ace, so I got out my copy of "Yours Truly" Harvey Donaldson's book. It is a great book to read through and Harvey as you note was a very smart guy when it came to what made bullets really fly and fly accurately. i then remembered when I first read about the 224 I could not find really any much information about the details, but your comments got be thinking so I did some digging. I cannot find the copy of Dec. '71 Precision shooting mag which has the first article on the 224 Ace, but I did grab a copy of the Nov. '72 copy of Rifle Magazine that also has a full writeup. I will post that info when I get it.
Here are the case sizes of the .219DW, 224 Ace, and the .225 Winchester, along with 22-250 for some comparisons.
219DW
224 Ace
225 Win

22-250
So it appears that the 224 Ace is a shortened 225 case with a 30° shoulder, that becomes basically a semi-rimmed 219 Wasp!
Furthermore the 219 and 224 cases are very efficient. If you look up load data you can get basically 3,700 fps with a 55gr from a 224 Ace with half the powder that the same 55gr takes in a 22-250.
I did also have concern that the 225 would be over-bored, but a 224 Ace necked down to 19 or 20 cal should be good and still get .220 Swift velocity with less powder.
RCBS has resizing dies to take the 225 to 224 Ace, as well as reloading dies (for .224), however I am sure that custom dies can easily be made.
I am not worried about the supply of 225 brass, Midway sells it (http://www.midwayusa.com/product/2900227108/winchester-reloading-brass-225-winchester) as well as others. The .19 Cal bullets would be an issue, but if something happens to the source I could always rebarrel to .20 or .22.
As far as the EA Brown 97D rifle, well I got it during the winter and have not had a good day to try it out, but I do have some shells loaded ready to go. Brass is available from EA Brown or from a guy on Gun Broker which is all made from .30- 30.
Thanks again for the tip. I will do some more thinking and planning.
Here is some additional info on the 224 Ace: http://www.loaddata.com/members/search_detail.cfm?MetallicID=3245#ixzz2wowm8YlM