Been a problem for years Jez, don't think it will ever be sorted. My readings this year go from 756 to 803 using same rifle and I assume same chrono. Luckily I'm under on a
L occasions as I use 7.9g express.
The Pope HW97 V-Mach. Gary Cane Laminate stock. Leupold Competition 40 mag Mildot.
The Smiler. Walther LGU. WE Laminate stock. Leupold Competition.
The Dark Destroyer. TX200 MK3. Leupold Competition 40 mag.
Pro-Sport. Warren Edwards Blue Laminate stock. Bushy 8-32x40.