Am loading once fired brass (batch of 50 Winchester) out of a Remington M700 in .308 Winchester.
Measuring runout with a Sinclair runout gauge.
Runout started at half a thousandth to 1.5 thousandths right out of the chamber. Sized them with a Lee Collet die. Most ran 1 thousandths to 3 thousandths neck runout. There were a few that ran more than that, but I culled them out. All were inside chamfered.
I seated 168 SMK's using a Redding competition seating die. A few had really good bullet runout 2-3 thousandths, but the norm was 3-5 thousandths. Some ran really high....like 8-10 thousandths. A couple was like 12-15, but I pulled the bullet, resized the case and reseated, and was left with 7 thousandths for that one....
How in the world can a case that starts with 1-2 thousandths neck runout, end up with 5-8 and sometimes greater bullet runout when seated with a precision die like the Redding Competition seater???
Is it varying inside neck thickness? I understood that was pushed to the outside when sized with the collet die, and would show up in neck runout?
Is better brass like Lapua the answer? I could neck turn, but I have a factory rifle, and understood that neck turning could have negative effects in a loose chamber.
Thanks in advance
Measuring runout with a Sinclair runout gauge.
Runout started at half a thousandth to 1.5 thousandths right out of the chamber. Sized them with a Lee Collet die. Most ran 1 thousandths to 3 thousandths neck runout. There were a few that ran more than that, but I culled them out. All were inside chamfered.
I seated 168 SMK's using a Redding competition seating die. A few had really good bullet runout 2-3 thousandths, but the norm was 3-5 thousandths. Some ran really high....like 8-10 thousandths. A couple was like 12-15, but I pulled the bullet, resized the case and reseated, and was left with 7 thousandths for that one....
How in the world can a case that starts with 1-2 thousandths neck runout, end up with 5-8 and sometimes greater bullet runout when seated with a precision die like the Redding Competition seater???
Is it varying inside neck thickness? I understood that was pushed to the outside when sized with the collet die, and would show up in neck runout?
Is better brass like Lapua the answer? I could neck turn, but I have a factory rifle, and understood that neck turning could have negative effects in a loose chamber.
Thanks in advance