It is now November 2014. According to my data Sam and I started working on the 500 Nitro in January of 2012, and continued on and off work until March of 2013. During this time frame I have come to believe that the most significant gains from this work was Sam's design of the 510 gr #13 Safari Solid and its matching 475 Raptor, and the pressure work done with these loads.
The superior design of the #13 Solids one no longer has to rely upon sectional density to get the penetration needed with a solid. The same goes for the Raptor when considering a soft, or trauma inflicting bullet. One no longer has to go heavy for caliber to get the performance needed or desired.
Sam was the first to use these bullets with me in Australia 2012, proving their performance on several buffalo. The performance of the 510 #13 Solids has been proven as well on several elephant, our friend Mike Nice and his son in law, Beau took elephant with the 510 #13 Solid with ease. Mike Sager recently hammered a elephant cow at close range with the 510 #13 Solid. On several occasions the combination of these two bullets have been used on buffalo and hippo, and have proven their performance beyond any doubt.
The development of these two bullets, and the ability to push the 510 #13 Solid up to or around 2300 fps, the matching 475 Raptor to that velocity or better, and stay well under maximum pressures for double rifles, in my opinion is the greatest development for 500 Nitro since its very conception. These bullets enhance the 500 Nitro far beyond anything it has ever been.