If you are not at pressure yet.. 24.7Thoughts? RL15 and 69 TMK @100 Benchmark 1:8"
23.9 24.1 move seating depth in and out .002 increments total of .006 both ways.
LitLBoy
24.8 and 25.0 ? Maybe even 25.4 to get it .
There have been some replies to this thread that I really didn’t understand. I think the obvious answer here is to load somewhere between 24.3 and 24.6 and fine tune your seating depth.
Water line looks good and less horizontal than the 23.4 charge. And yes 24.8 or 25 just might answer all the questions.
LitLBoy
PS What makes 24 a scatter node?
Thanks
For my purposes this would not be very valuable as the groups were only three shots each, despite lots of groups, the range was restricted to 100 yards and velocities were not measured. In my thinking 69 grain bullet loads for a .223 with a 1-8 would be intended for ranges up to and including 600 yards; at that distance velocity spreads would be a consideration. Many tight 3 shot groups have been fired at 100 yards but have had considerable velocity spreads. A .1 grain powder charge increment is .4 percent of a 24 grain charge and might not affect much of anything.
If possible testing at 300 yards and even better at 600 might be more definitive.