Pharmseller I hope this helps you. I get 3180 fps with my 20" 1-9" HBAR using TAC and 50gr ZMAX, and I still have alittle more room to go up in my powder charge (2.250" COAL). The 53gr VMAX has a G1 BC of .290, I'm thinking I can drive that to 3200 fps. But lets say I only get 3150 fps using Benchmark. Compare that load, I use JBM, to your 50gr BT going 3400 fps. You could try the 53gr VMAX in the 16" barrel but I doubt you'll be able to match the trajectory of you NBT at 3400 fps. But the VMAX is more explosive so your brother might like the results. Hope this helps.
