Ok. Got a tech question for you guys. What is the difference between a bonded and a jacketed bullet? Why are bonded bullets so much more finicky in my rifle.

Let me fill you in on my dilema. I bought a Win Mod70 Ultimate Shadow 300wsm a month or two ago.
My 1st box of bullets were 165gr fusions. Couldn't get them to group for nothing. So I tried some 150 Win Ballistic Tips. Shooting nickle groups at 100yds. I'm not a big ballistic fan though.
I bought what I thought were some 150gr Win XP3's the other day. Ended up being 165gr ballistic tips. I shot about 1/2 the box before I realized that the XP's were suppose to have a red tip on them. Took them back and gun shop gave me the right ones. Got them to the range and same thing as the fusions. All over the place. I put a few more ballistic tips in and back to nickle size groupings again.

So what gives with the bonded bullets? Why am I having issue's with them? What about ACCUBond bullets? Do they have the same principal behind them as the fusions and xp3's?

THANKS RH