deeangeo
Well-Known Member
It doesn't come as a surprise, but measuring F/L sized brand new Norma MSch 6.5x54 brass, concentricity between neck/body is max. .0005"/ 1/2 thou.
Bullet seating, using a Redding seating die with the correct 'dome' insert for seating a Hornady #2640 160gn RN bullet, produces even taking the very best care in technique when seating,
concentricity variations of - greatest majority within .0015" - .002" run out & some (5%) @ .003" run out, but 5% greater than .004" run out.
I have no idea why there are these variations, but guess it's either the bullet that's the problem, or harder to determine, but something I did while seating the bullet.
Odd!
Bullet seating, using a Redding seating die with the correct 'dome' insert for seating a Hornady #2640 160gn RN bullet, produces even taking the very best care in technique when seating,
concentricity variations of - greatest majority within .0015" - .002" run out & some (5%) @ .003" run out, but 5% greater than .004" run out.
I have no idea why there are these variations, but guess it's either the bullet that's the problem, or harder to determine, but something I did while seating the bullet.
Odd!
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