Bad Ass Wallace
11-14-2005, 09:06 AM
Got to thinking about the internals of my 30.06 springfield particularly in the neck area.
I shoot a Lyman 311284 which cast in WW comes out of the mould .310. I lube in a .310 sizer. If the standard jacketed bullet is .308 then upon firing, the case neck expands to let her go. With cast, the amount of expansion is reduced because the bullet is already .002 oversized.
Recently I started outside neck turning .004 off each case and using a neck expander from CH that is .309 rather than the RCBS expander which mics .305. I thought that .001 would allow the boolits to fall out of the case but they are quite firmly held.
Grouping has tightened considerably from 1.75MOA down to 1.1MOA with a more than occasional sub MOA cluster.
My other bench gun is a 7x57 Mauser and I can't wait to see if proper neck tturning and a larger expander will net similar results?
http://img.photobucket.com/albums/v152/BAWallace/Springfield_cast.jpg
I shoot a Lyman 311284 which cast in WW comes out of the mould .310. I lube in a .310 sizer. If the standard jacketed bullet is .308 then upon firing, the case neck expands to let her go. With cast, the amount of expansion is reduced because the bullet is already .002 oversized.
Recently I started outside neck turning .004 off each case and using a neck expander from CH that is .309 rather than the RCBS expander which mics .305. I thought that .001 would allow the boolits to fall out of the case but they are quite firmly held.
Grouping has tightened considerably from 1.75MOA down to 1.1MOA with a more than occasional sub MOA cluster.
My other bench gun is a 7x57 Mauser and I can't wait to see if proper neck tturning and a larger expander will net similar results?
http://img.photobucket.com/albums/v152/BAWallace/Springfield_cast.jpg