Let's get a little deeper...

Ballistic Coefficient has to do with how streamlined a bullet is...A bullet with a higher BC will fly flatter than one with a lower BC if they both leave the barrel at the same speed...

Sectional Density has to do with how well two bullets that are constructed the same will penetrate if they hit the target at the same speed...

I've been playing around with the Hornady Ballistic Calculator for a few days, here are some figures for different bullets...

250SST/Shockwave...Launched with 150grs of powder, which gives it a higher BC and I already know over 90grs the groups open up in my rifle...BC .210 SC .175...

300gr .452 XTP... BC .180 SC .210

250gr .452 XTP... BC .146 SC .175

300gr .429 XTP...BC .245 SC .232

240gr .429 XTP...BC .205 SC .185

Of these the .429 300gr has the highest BC and the highest SC...

One reason I tried the SSTs is they flew flatter at 150 yards than either the 295 PowerBelt and the .300gr Barnes MZ in my Knight Disc with a 22 inch barrel...

Like many I found the SST didn't mushroom well because of the sharper tip design...A hollow point travelling at the same speed should mushroom better than the sharper tip designs...I went to high shoulder shots to help this bullet open up and had bang flops on my kills...A buddy that was using them found that on broadside lung shots the deer were running 100yards and the exit wound was about the same size as the entrance...

The guy that developed the Savage smokeless design lives up in Greensboro and posts on the NC Hunting Site...He loves the .452 300gr XTP in his guns, but he is pushing them at 2200fps...My Knight using Pyrodex or Goex is probably pushing a 300gr closer to 1500-1550fpr...I'm suspectiong that he can't use the .429s with the green sabot because the thicker sabot won't handle the pressures that he is shooting...

What I'm wanting to have is a bullet that I can sight in 2 1/2 - 3 inches high at 100 yards and be no more than 4-5 inches low at 150...

I'm hoping the .429 300gr XTP will do this, if it doesn't group well in my rifle then I'm going to try the .429 240gr XTP...

I've already tried both the .452 300gr and the .452 .250gr in my Knight and neither grouped well...I have high expectations for the .429 300gr XTP because it's a longer bullet than the .452 300gr as is the 300gr MZ...My Knight loves that 300gr MZ and if neither .429 bullet groups well I'll either go back to that or continue to use the 250SSTs...