I do know that my i-20 really shoots the 200 SST along with the shockwave and the .223 gr. powerbelt very very well. The 2 deer I took with the 200 SST's were dead before they hit the ground. The last 1 was less than 50 yds. after the bullet hit her all she did was turned 180 degrees and see was dead before she hit the ground. Her heart was liquified. Just my .02 cents.