Originally Posted by boomtube
Just out of curosity, what factory rifles, bulk bullets and cartridges have you found that narrow 6-10 thou seating window in?
This is mostly what I've messed with over the years;
*223- Cooper (1/4moa)
*6br- Browning rebarrel (3/8moa)
6XC- Tubb2000 (McMillan)
*6.5wssm- BAT IBS LG (3/8moa)
6.53Scramjet- Savage (Lazzeroni)
*what I currently hold
Bart I have no problem holding headspace, fired or otherwise, to 1.5thou. MINE doesn't change on primer firing.
Boomtube I have no problem holding desired seating depth to lands under 1thou tolerance.
This, because I qualify bullet ogive radius, use only Wilson inline seating, and my neck tensions are measured & matched.
Also, my primers are set to the same depth at exactly the desired crush.
Man, I must be a miracle worker...
To me it seems ridiculous to generalize that these things can't be controlled. They can be, and when they are, it can payoff. If I were to let slip the seating for my Cooper by 6thou either way, grouping would immediately double in size.
Fortunately, I could not possibly be off by so much as 1thou & not catch it through measure.