I haven't gotten better accuracy shooting the 50gr as compared to the 44gr in any of my 30 caliber FX guns so far. I haven't tried them in my Daystate Renegade 303 HP yet but the 44s shot so well I never ventured to try anything else.
I'm using the 50.15gr in the Daystate Wolverine .303 and even my youngest can literally drive tacks at 50 yards. It's a very good fit. Average speed on the last test was 938 fps.