So far as I know
johnny, you and I are the only Mustang owners in the entire world. So, I'll give you all of the help I can.
Unfortunately, I haven't shot mine with GOEX much - only a few loads very recently. For my total experience with it seemy post "
GOEX In The Mustang" at
http://www.huntingnet.com/forum/tm.aspx?m=2849380&mpage=1&key=GOEX%2cMusta ng&#2849380 and "
More GOEX In The Mustang" at
http://www.huntingnet.com/forum/tm.aspx?m=2878971&mpage=1&key=GOEX%2cMusta ng&#2878971
Most of my shooting has been with T7 and Pyrodex. As I've said before, my Mustang will shoot just about anything "hunting load" accurate (i.e. three inch 100 yard groups) but it's no one hole rifle, at least not with any load I've tried - and I've tried a lot.
My personal hunting load is 80 grains weight of T7 FFG(about 100 grainsvolume)under a 300 grain Speer Gold Dot in a Harvester short black sabot. I getaround 1750 fps with this load. The target below is representative of the kind of groups it will shoot if I do my part.Note that each shot on this target was from a fully cleaned barrel that was wiped with a very lightly oiled patch after the bullet was loaded. I use this load because I can leave the gun loaded as long as I want with no worry.
Since you have some Hornady 240 XTPs, I checked my records for that bullet. I shot some of those in March `07and got some of the worst groups my gun has ever shot. I got 5" 100 yard groups with 100 grains of Pyrodex Selectat 1600 fps, and 3 3/4" groups with 85 grains T7 FFG (didn't record velocity). Of course, every gun is different and yours may shoot them just fine. But Ifind longer bullets work better in my gun and those 240s are pretty short.
I have had pretty good results with the 250 grain Gold Dot in crush rib sabots over 90 grains T7 FFG. Got an average velocity of 1738 fps and 1 1/8"
50 yard groups. The group opens up to 3" at 100 yards, but that's still plenty good enough for deer.
When I first got the gun I was shooting 245 grain Barnes Spitfires and they shot real well. Something like 2 1/2" 100 yard groups. Being all copper they are long for their weight.I just won't pay the price for them anymore.
I've done some very limited shooting with slip fit conicals if you're inclined to go that way. The.503 460 grain Bull Shopsshowed promise.See "
Sabotloader Is A Cruel, Cruel Man" at
http://www.huntingnet.com/forum/tm.aspx?m=2692410&mpage=1&key=bull%2cshop& amp;#2692410
I'm looking forward to reports of your shooting results.