7mmRM 175 Part Grand

[Bruce Mc]

Got out today to try Grand with 175 Partition in 7mm Rem Mag. Ran out six rounds to look at velocity and pressure signs. Hodgdon shows 72.2 gr as max at 3024 fps.

Rifle Mod 70 Win 26"barrel
Winchester brass
CCI 250 primer
3.342 OAL

71.0 2965 fps
71.3 2980 fps
71.6 3022 fps
71.9 3060 fps
72.2 3055 fps
72.5 3062 fps

The entire group was around 2". The last three were a tad over 1/2". There were no pressure signs so I'm not convinced that the 72.2 is a max load. There may be a sweet spot right around it though.

#### I have a typo in the first paragraph, Hodgdons data show max load 72.2 gr for 2940 fps.

 

[RL338]

I agree with exploring the 72.2 grains.

 

[wildman]

Got out today to try Grand with 175 Partition in 7mm Rem Mag. Ran out six rounds to look at velocity and pressure signs. Hodgdon shows 72.2 gr as max at 3024 fps.

Rifle Mod 70 Win 26"barrel
Winchester brass
CCI 250 primer
3.342 OAL

71.0 2965 fps
71.3 2980 fps
71.6 3022 fps
71.9 3060 fps
72.2 3055 fps
72.5 3062 fps

The entire group was around 2". The last three were a tad over 1/2". There were no pressure signs so I'm not convinced that the 72.2 is a max load. There may be a sweet spot right around it though.

How much case capacity do you have left @72.2 ?

 

[SJB358]

That’s hauling bass Bruce! God, if you could make it shoot around 3k that’s pretty danged cool. I need to try some of that stuff.

 

[Bruce Mc]

I sure wish the Ramshot Grand profile was available in quick load. I'd like to see the pressure estimates on these loads.

 

[SJB358]

Wonder if it’ll be in the latest update?

 

[Charlie-NY]

I sure wish the Ramshot Grand profile was available in quick load. I'd like to see the pressure estimates on these loads.

Ramshot Grand and Ramshot Magnum seem to have the same burn rate. That might be a good place to start.

 

[jimbires]

maybe a call , or e,mail to Ramshot . I kind of remember reading that GRAND , and MAGNUM were the same powders . the difference being , GRAND is supposedly temp stable .

************** I could be wrong on this . sometimes my rememberer doesn't remember to good . ******************


this might be what I was remembering .

https://www.handloadermagazine.com/propellant-profiles-44

 

[Guy Miner]

Thanks for that info! Sending a 175 downrange accurately at 3,000 fps from a 7mm Rem mag is terrific. My ancient H870 load was over 2900 fps, but that was long ago and H870 had drawbacks.

I bought 8 pounds of Grand recently and have seen good results so far in the 25-06, am at 3350 fps with a 100 gr Barnes from a 24" Remington barrel. Good accuracy too.

I think that Ramshot Grand is going to prove to be a very good powder for "overbore" type cartridges.

Guy