I am working up a new load for my 7mm Rem Mag and am wondering if I made a mistake on where to start out with the COL. I figured I would be safe mirroring factory Remington premier accutip ammunition COL, which was 3.237. Also when I compare the amount of the cantalour on the bullet that I can see when seated it looks correct according to my reloading books and the Remington premier accutip ammunition.
But as I am looking through many of the posts here, yes I used the search function before I posted this, I am seeing that most posts COL for 7mm Rem Mags are around 3.280 - 3.290. I have read and think I understand that the COL that is best for your rifle is based on how far from where the bullet starts to impact the rifling, and that seating the bullets that impact the rifling upon chambering can greatly increase pressure. But what about the other way around?
So my question is, am I safe with the below loads COL or do I need to pull them and go based off the Hornady reloading manual COL which is 3.250 for 139gr and 3.290 for 154gr? Below are the loads I am referring to.
Ammunition Type: 7mm Rem. Mag.
Bullet: Hornady 154 gr SST
Case trim length: 2.491
Powder: RL-25
Powder Gr. 65.1
COL 3.24
Ammunition Type: 7mm Rem. Mag.
Bullet: Hornady 139 gr SST
Case trim length: 2.491
Powder: RL-25
Powder Gr. 69.5
COL 3.228
Thanks for your advise on a newbie reloading question!
But as I am looking through many of the posts here, yes I used the search function before I posted this, I am seeing that most posts COL for 7mm Rem Mags are around 3.280 - 3.290. I have read and think I understand that the COL that is best for your rifle is based on how far from where the bullet starts to impact the rifling, and that seating the bullets that impact the rifling upon chambering can greatly increase pressure. But what about the other way around?
So my question is, am I safe with the below loads COL or do I need to pull them and go based off the Hornady reloading manual COL which is 3.250 for 139gr and 3.290 for 154gr? Below are the loads I am referring to.
Ammunition Type: 7mm Rem. Mag.
Bullet: Hornady 154 gr SST
Case trim length: 2.491
Powder: RL-25
Powder Gr. 65.1
COL 3.24
Ammunition Type: 7mm Rem. Mag.
Bullet: Hornady 139 gr SST
Case trim length: 2.491
Powder: RL-25
Powder Gr. 69.5
COL 3.228
Thanks for your advise on a newbie reloading question!