That's Great News. 120 grain bullets and H4350 are just a magic blend in the .280AI. Your velocity should be running between about 3,325 and 3,400 fps depending on your barrel length.
With the TSX you should be set for most any critter smaller than a cape buffalo.
Dunno how that combo will work in an ancient 99 in 284, but I'm fixin' to find out. If it's a dog all I'm out is my pride and a few bucks, but if it shoots in an inch at warp speed (for a 99) I'm in business.
Wayne
