If it reacts like 777 does with lighter loads and the 180gr....it will...ive seen plenty of chrono data for 80-90gr of 777 vs the same amount of BH209. In the 45s, BH209 starts to pull ahead with a heavier bullet or top end powder charges. On the light loads 777 is just as fast and the last Backmag was right in the same ball park as T7. Im also curious to see how it compares in the older Knight NFPJ conversion. I have one and the rest are all Lehighs.