7mm stw brass trim length

doublebull82

Member
Joined
Jan 28, 2015
Messages
16
What length are you guys trimming your brass to my book says 2.840 but I have some once shot nosler brass that measures 2.830 just wondering if I should keep them at Since I have winchester brass that's 2.840
 

Jokostel

Well-Known Member
Joined
Dec 1, 2011
Messages
359
Location
Bismarck,ND
Most factory brass is going to be a breath short.
As it fire forms... it may get a breath shorter due to brass flowing to the specs of the chamber... however, the growth is almost always done thanks to the sizing process..
be it small base dies , FL dies.... or neck sizing only.
Long story short... it's a few thousandths diff... but if you want to maintain the best consistency with loads trim your brass to X length AFTER they are fire formed.
 

Edd

Well-Known Member
Joined
Jan 26, 2011
Messages
3,814
Location
Tulsa
The SAAMI spec for brass length is 2.830" - 2.850". Unless you measure your chamber and trim based on the actual measurement of your chamber, you need to stay within the SAAMI specs.
 

Trending threads

Top