What a day at the range when it all comes together!! I took my .375 Weatherby Magnum to the range this morning as I did yesterday but made some small load changes. I only had time after setup to fire 6 rounds waiting five minutes between rounds. I had changed my OAL down to 3.640" to give the 300gr TSX a good jump which in the past has proved very accurate when using the TSX. Then I used two groups of weighed 300gr TSX's. One group weighed 300grs and the other was 1/10th grain less. It is so cool to find the load so quick. The first target shows the lighter bullets at about 1:00 o'clock on the target and it measured .764". Then I adjusted the wind-age and elevation and used the TSX that weight exactly 300grs which is the group at 12:00 o'clock that measured .350" and the average speed for the six rounds of 93grs of H4831sc was 2783fps. Adjusting the OAL made a difference in accuracy and velocity.
Smallest group is .350" the lager one is .764"