dak0ta
Member
- Joined
- Feb 14, 2008
- Messages
- 2,428
Hi,
I loaded a sub-MOA load at 100m with my .270 Winchester using Lee FL sizing dies and Nosler 150 gr Ballistic Tips. I am using IMR4831 53.5gr. The bullet is seated just off the lands.
Neck sizing with the Lee Collet Die using the same seating depth and powder charge opened up the group to 1.5-2 MOA.
I was wondering if I should keep the same powder charge and play with the seating depth. I know FL sizing may be more accurate as it allows the bullet and case to centre itself into the bore (cone within a cone). Perhaps neck sizing negates the cone within a cone advantage and seating the bullet at the same depth makes it enter the rifling off-axis? Would prepping some reloads with progressively deeper seating depths yield improvement? The 53.5gr powder charge was the most accurate out of my FL sized samples.
I loaded a sub-MOA load at 100m with my .270 Winchester using Lee FL sizing dies and Nosler 150 gr Ballistic Tips. I am using IMR4831 53.5gr. The bullet is seated just off the lands.
Neck sizing with the Lee Collet Die using the same seating depth and powder charge opened up the group to 1.5-2 MOA.
I was wondering if I should keep the same powder charge and play with the seating depth. I know FL sizing may be more accurate as it allows the bullet and case to centre itself into the bore (cone within a cone). Perhaps neck sizing negates the cone within a cone advantage and seating the bullet at the same depth makes it enter the rifling off-axis? Would prepping some reloads with progressively deeper seating depths yield improvement? The 53.5gr powder charge was the most accurate out of my FL sized samples.