How far off the lands?
#11
Nontypical Buck
Join Date: Aug 2005
Location: S.W. Pa.-- Heart in North Central Pa. mountains-
Posts: 2,600
#12
Fork Horn
Join Date: Feb 2003
Location: Altadena CA
Posts: 494
I shoot various slugs. Not that it matters much because the mag well limits the OAL. These rifles have a lot of shots through them, so I could be looking at throat erosion. However, they still both shoot sub-MOA.
#13
Well when I reloaded I did a huge personal study on this with my .270 win M70. I bought a RCBS case mic and found the exact distance to touch the lands and set my dies up to this. Then I set five back .005", another five back .010" etc etc until I reached the normal factory length. I don't remember what that is now offhand.
What my testing showed me was that there (for my rifle and loads) was no advantage to getting the bullet close to the lands. The normal length grouped just as well without possible feeding problems etc. I also had more pressure signs when close to the lands (flattening primers etc).
What my testing showed me was that there (for my rifle and loads) was no advantage to getting the bullet close to the lands. The normal length grouped just as well without possible feeding problems etc. I also had more pressure signs when close to the lands (flattening primers etc).