by Gaznazdiak » 14 Feb 2018, 1:58 pm
@sungazer
When still as low on the learning curve as I am, there will never be offence taken at advice given constructively.
As I am still building my "kit" I had someone with a shed load of instruments, and decades as a military weapons instructor and target shooter, take the measurements for me for each projectile I use and calculate best OCL for each given ogive.
As I am using a Lee die set that does not have a calibrated seating die I have been measuring every fifth round to check OCL and they have been consistent.
One thing I forgot to mention in my above question, when I had tried lowering the load by 1gn, I tried seating one more round, 1mm deeper with the same load and the cratering was less pronounced but still visible with a loupe, where previously it was obvious by touch and unaided sight.
I must admit, even though I batch both my brass and my projectiles by weight it has never occurred to me, embarrassingly, that the extra weight of the pills would be as a result of extra length.
I am currently having one of those DUHH moments.
This could also explain why my self inflation at being able to give Tony Rabbit the good news at 400m turns to embarrassed frustration at large groups when shooting at the rifle range from 500 to 900m.
Seems I'm going to have to do a lot more reading a some more spending.
Thanks for the advice.
fideles usque ad mortem