try
http://www.sixgunner.com/linebaugh/dissolving.htm
More info there than you can imagine
I have several friends that have had excellent performance from XTP's, and several others that have had bullets blow apart. Dunno. My concern would be hitting a front shoulder.
If and when I get a deer with my Bisley, it will be a 255LSWC over 11.0 of AA5 (RUGER ONLY LOAD, listed in the AA reloading pamphlet). Same general burn range as Unique but significantly cleaner. This about duplicates Linebaugh's "favorite", shoots easy, and should give total penetration.