I had just gotten done a week ago working up a load for my Winchester Model 70 Pro 64 S/A. The barrel is chambered in 270WSM is a Hart SS Contour 10-MTU 26" long has a 1:10 twist.
I worked up IMR-4350 from 58gr to 62gr, Bullets are SMK 135gr, COAL +0.010" jammed, and ladder tested without any pressure signs. Best range was from 60.2gr to 60.8gr. I fired two five round groups from 60.2gr to 60.8gr COAL at +0.010" jammed in 0.1gr increments. The best overall groups were from the set of rounds loaded with 60.5gr COAL +0.010" jammed.
This week-end I shot over at TVP in Ohio. Until then I had not chrono-ed the round due to not remembering to bring the chrono to the range with me all five times I went. When I did chrono the rounds at TVP the average was 3250fps with +/- 25fps deviation.
With all that said..... Is it possible to be firing these pills too fast? The rifle shot well at TVP, and I check all my cases once I had gotten home. All my case were gtg without any pressure signs.
Should I just leave it as is, or do another ladder test starting at 55.0gr to 60.0gr, and see where the node is at lower velocities?
I worked up IMR-4350 from 58gr to 62gr, Bullets are SMK 135gr, COAL +0.010" jammed, and ladder tested without any pressure signs. Best range was from 60.2gr to 60.8gr. I fired two five round groups from 60.2gr to 60.8gr COAL at +0.010" jammed in 0.1gr increments. The best overall groups were from the set of rounds loaded with 60.5gr COAL +0.010" jammed.
This week-end I shot over at TVP in Ohio. Until then I had not chrono-ed the round due to not remembering to bring the chrono to the range with me all five times I went. When I did chrono the rounds at TVP the average was 3250fps with +/- 25fps deviation.
With all that said..... Is it possible to be firing these pills too fast? The rifle shot well at TVP, and I check all my cases once I had gotten home. All my case were gtg without any pressure signs.
Should I just leave it as is, or do another ladder test starting at 55.0gr to 60.0gr, and see where the node is at lower velocities?