The powder weight is 86.5 Gr., 0.5 Gr above the max load of 86.0 Gr published for Weatherby calibers by IMR. Stated velocity is 3240 for 86.0 Gr. I questioned the velocity as well but averaged 20 rounds on two different days. I also verified the ballistics out to 900 yards and was within an acceptable margin of error.
The factory Weatherby casings actually show more signs of pressure than I am seeing with this load by inspection. I also checked through case expansion to double check. The only significant variable is the Wby has a 3 groove barrel and obviously free-bore. Overall it is a great load. Great accuracy, great velocity and acceptable pressure.
