Re: This may have been answerd but i need more Info
Let me also add that it was a very fine shot.
I've been watching this thread from the first post and, like the others, am detail oriented. No disrespect meant but like Warren said, we get into the details and the data didn't match well. This data discrepancy quickly, as you saw, drew comments and questions.
As you are now keenly aware, the folks here at Long Range Hunting are here to learn and provide accurate information.
Again, I'm glad you got the data figured out and we're on our way again to answering your initial questions.
My observations on long range small caliber terminal ballistics has been that when the velocity gets too low and bullet is essentially a non-expanding solid. The small size of the .224 bullet and the short length don't allow for much damage due to tumble (a fox is a small critter and the bullet may not get an opportunity to tumble).
I've found that a longer bullet seems to work better at long range, twofold reason, better shape and higher BC, and when it upsets (tumbles) it makes a large wound channel.
I used a .243 with 70 grain Ballistic Tips on deer at distances past 500 yards, double lung shots, and generally had pass through wounds and a dead critter in short order. But I later switched to a 6mm-06 and the 107 MatchKing and saw considerable difference in wound effect, some of this was certainly due to the faster 6mm-06 but I believe the long 107 MK had a great deal to do with the significant difference.
On a fox at those distances I don't know what would work well, but on a larger animal the bullet gets a little opportunity to 'dance around' a little. I guess the fox issue would be to go far a bullet that makes a large hole on a pass through because I don't believe you'll find a bullet that will fragment of mushroom at those low velocities.