Quick load help for 300 Norma Mag

[gaza916]

Would anybody be kind enough to run a load for me? I’ve just done an initial load to start running in a barrel at the charge that was recommended to me but once I’ve run it in want a bit more velocity - would also be useful to compare the QL data to what I’ve achieved today.

Initial Load:

300 Norma Mag
220gr Hornady ELDX
87.5gr RS80
685mm barrel
1:10 twist
Bullet seated 12 thou off the lands
Averaging 2813 FPS over 15 rounds with no pressure signs. First string 0.75’’, second string 0.5’’ so it shoots well.

I’ve been told the max charge is 89.3gr but that was via a powder comparison chart read-across. Any help much appreciated!

 

[borbal]

Go over to www.bbt.scot/ballistics/pressure.htm and have a play

You will need a usable case capacity. Case capacity of the 300 Norma Mag is about 102 grains H20 or there abouts. With a 220 grain bullet stuck into it, that will probably leave a usable case capacity of about 90 grains.

 

[Edinburgh Rifles]

very low pressure load




RS70 is a better option

 

[Lateral]

Without knowing true case capacity, or OAL, personally, I like the look of either RS76, or RS80. Based on QL, both can achieve over 3000fps, at below Pmax, and using a barrel time node of circa 1.380.

It's using a lot more powder though

 

[gaza916]

very low pressure load

View attachment 181954


RS70 is a better option

View attachment 181955

Many thanks Ed - any chance you could run the max load for me with RS80?

Cheers,

Gary

 

[Edinburgh Rifles]

Many thanks Ed - any chance you could run the max load for me with RS80?

Cheers,

Gary

Can do
You’ll run out of space before you run out of pressure

ill advised when burying such long bullets into powder columns of large magnum cases