338RUM Accuracy Load?

[idaholonggunner]

I'm having a 338 Ultra Mag built and would like some assistance with a good 300gr Matchking load. Rifle will be used @ extreme long range, so accuracy is paramount.

Also, has anybody found a source for reasonable Rem brass for this round?

Thanks in advance.

 

[royinidaho]

Best load for my 338 RUM and 300 SMK is US 869 and Fed 215 GMs. ESs in single digits. 2700+ fps out of a 26" sporter barrel.

 

[idaholonggunner]

Thanks Roy!

 

[Bigcat_hunter]

I use 92 grains of H1000 and Federal match magnum primers with the 300 smk. I get 2770 out of a 26" barrel.

 

[Chawlston]

I use 92 grains of H1000 and Federal match magnum primers with the 300 smk. I get 2770 out of a 26" barrel.

What sort of velocity spread are you getting? Thanks in advance.

Chawlston

 

[Bigcat_hunter]

What sort of velocity spread are you getting? Thanks in advance.

Chawlston

What do you mean by velocity spread? I can get it to shoot faster but it starts showing pressure signs with any more powder than 92 grains.

 

[Chawlston]

What do you mean by velocity spread? I can get it to shoot faster but it starts showing pressure signs with any more powder than 92 grains.

The velocity spread I am talking about is from shot to shot. How consistent is the velocity in say a five shot string? Thanks.

Chawslton

 

[Bigcat_hunter]

The velocity spread I am talking about is from shot to shot. How consistent is the velocity in say a five shot string? Thanks.

Chawslton

Its very consistent. If I remember right there is no more than 5 to 10 fps change with a 3 shot string.

 

[davewilson]

try the CCI mag primers. they work very well with this combo.