Cameroo, I've made 8-9 bows now with birch as the core wood, they have all preformed very well and are snappy shooters. I usually back them with heartwood hard maple, this one is hickory backed with some wood from Ken 75. I have yet to find the slightest sign of compression problems, no excessive set, no compression fractures.....nothing like that. I cant speak to suitability for self bows because I have not made one of those yet. Also the grain orientation has been "any which way" from plain sawed to rift sawed and quartersawed.....dosen't seem to make any difference. I used it to back an ash bow and it performed well there as well.....but that's only one bow so take it with a grain of salt, too.
Thanks you fellas for the comments, this little bugger shoots hard and I REALLY like the bend through "D" bows, the mid to upper 50" range seems about ideal for my 26+" draw. Younger, stronger guys would probably like 'em a little shorter....cause they build power in a hurry.
rich