308 Win and 2400 powder shooters

[MGySgt]

What kind of primer are you using?

Read an article the other night about a the 22 Hornet and the guy was using 2400 powder. He had switched from Rifle Primers to Pistol Primers and got better accuracy (J bullets).

I remember a long time ago working a load with 2400 and LP Mag primers - the accuracy just wasn't there, remembered what Elmer said about 2400 and Mag primers and switched to regular LP primers and my groups shrank to what I expected.

Wondering if it could be the same with Larger Rifle and Large Pistol primers in the 308 win loads.

Anyone out there using LP primers in the 308 Win?

[MGySgt]

Initial test:

LC 01 brass, RCBS 308-165-Sil (Actual weight is 172+ grains) 19.5 grains of 2400, CCI LP primers

Group was smaller with a lateral dispersion. Maybe me, maybe not. That was a 5 round group.

I want to try 20.0 grains before I settle on 19.5 (or drop to 19.0)

Time will tell.

Oh - the Primers were flattened a little bit but not as much as my 44 mag loads which has a higher chamber pressure than what I am loading in the 308 Win.

[MGySgt]

Second Test:

LC 01 brass, RCBS 308-165-Sil (Actual weight is 172+ grains) 20.0 grains of 2400, CCI LP primers.

Primers seemed to be no flatter @ 20 gr than they were at 19.5 grains.

Group shrunk from 2.4 to 1.4 inch.

2.25 - 2.5 was the best I could get with large rifle primers (Remington didn't try the CCI's). I have dropped 3/4's of an inch for 5 rounds.

Beginning to wonder if I should bump the charge to 20.5.

[MGySgt]

Well - 20.5 was a bust! Groups opened up to about 5 inches!

[MGySgt]

As I have some 5744 - I need to try it (go back to LRP for those too).

I am just not happy with 1.4 inch - Not bad mind you, just I think they should do better - I know my 45/70's and my 45/90's will out shoot the RGS Scout and the 45/90's have Soule Sights with front Globes!