vadeer,

I believe your RS conversion to black powder is not quite correct. Actually loose RS and 2fg Black Powder are actually pretty close to each other in strength. However, if comparing the 2 pellet load of Pyro to Black that would probably be close to correct - as a 50gr pellet of Pyro acyually only contains about 40gr of actual Pyro with the other 10gr being a burn accelerator.

When using 777 loose powder, you need to drop your charge about 15% compared to loose RS or Black Powder loads. so if your were firing 100gr of loose RS or Black, drop down to 85gr of 777 and you'll be real close to getting the same results on target.

However, if you want to compare Pyro Pellets to 777 pellets that's a different story. The 777 pellets were designed to duplicate the Pyro Pellets, so no reduction is necessary..............a 2 Pyro Pellet load is equal to a 2 777 Pellet load.