Just starting out reloading and trying to develop a load for my 300 WM. I have some fire formed brass from this rifle approximately 27 pcs and have picked up some once fire brass. I've got it sized and after measuring it almost every piece of the brass fire in my rifle is under SAAMiI overall brass length of 2.62" they are coming in about 2.615 roughly, so
(1) do all these need to be trimmed back to 2.61" or will they be ok for load development
(2) of the 27 pcs of brass shot in this rife they are not same brand of brass some Winchester and some Speer some of the other once fired brass (not in my rifle) is some Nosler and Barnes will using mixed brass make a huge difference in the load developmen? i will also be using a Chronograph for testing. I'm not looking for a load I can shoot F-class with mainly just as accurate a hunting round as I can get.
I will be using 180gr Nosler AB bullets with H-1000 powder using Nosler Load data
Thanks in advance
(1) do all these need to be trimmed back to 2.61" or will they be ok for load development
(2) of the 27 pcs of brass shot in this rife they are not same brand of brass some Winchester and some Speer some of the other once fired brass (not in my rifle) is some Nosler and Barnes will using mixed brass make a huge difference in the load developmen? i will also be using a Chronograph for testing. I'm not looking for a load I can shoot F-class with mainly just as accurate a hunting round as I can get.
I will be using 180gr Nosler AB bullets with H-1000 powder using Nosler Load data
Thanks in advance