Has anyone had any luck getting one to shoot sub minute? I have tried three bullets and 6 powders, played with primers etc and I just can't get anything under 1 1/2". I know Weatherby guarantee is 1 1/2 minute but surely it will do better. I've done searches on multiple forums and haven't found much on the 7 Weatherby. This is on a Mark V deluxe, scoped with a Leupold VX 3 in Burris Signature Zee rings. I have the same rifle in a 30-06 and easily 1/2 minute with IMR 4895 and a 150 Nosler BT. My .243, .223's and 30-30 I can get sub minute, so I know it isn't me.