Range Report 338 Norma Mag - range report: H1000 and Retumbo, .338 OTM's

[garandman]

Did a little 200 yards work, to get velocities and groups for my 338 Norma Mag. 27" barrel.

Observations:

1. Note where I "dialed in" W/E adjustments.
2. Squares are about 1"
3. H1000 ran about 70 FPS faster than Retumbo
4. Both grouped about half MOA


I'm interested in anyone elses experience with Retumbo and H1000. I heard Retumbo usually runs faster than H1000.

Your observations / comments welcome.

 

[P7M13SC]

How are you figuring 1/2 moa?

 

[P7M13SC]

You can up the Retumbo without signs of pressure more so than H1000 They are very close on the burn rate chart with H1000 being slightly faster.

 

[scharfschutze762]

Heard from the man who invented this cartridge use ramshot magnum or RL22.

 

[Brasscow]

Good results with retumbo for me. I'm loading right at what i would consider max in my rifle at 92gr retumbo pushing a 300 berger otm to 2846. 29" tube.

 

[garandman]

How are you figuring 1/2 moa?

Under an inch at 200 yards.

Shots 1 - 5 form a H1000 group. Shots 8 -11 form a Retumbo group. All other shots have W/E adjustments.

 

[garandman]

Heard from the man who invented this cartridge use ramshot magnum or RL22.

I found some Ramshot Magnum but I heard its real dirty ....

 

[garandman]

Good results with retumbo for me. I'm loading right at what i would consider max in my rifle at 92gr retumbo pushing a 300 berger otm to 2846. 29" tube.

Running a 27" barrel, would a faster burn rate be a good idea for me?

 

[Brasscow]

Running a 27" barrel, would a faster burn rate be a good idea for me?

I can't answer your question with actual experience, but i would guess that at 27" you'd be best served with retumbo as opposed to h1000. Since you have both powders i would recommend doing a bit of testing yourself to determine the right answer though. I think H1000 might be a hair quick for the 300 otm, but what the hell do I know, as you're clearly showing excellent velocity average of 2785 with just a test load. I'd be curious to know where you wind up when you push that one a bit harder.