Imr 7977

[PitBull1973]

So I've decided to switch powders for my PR 300 win mag only because RE22 is becoming harder to acquire. I ordered 8lbs of IMR 7977 but all I know that it's a great magnum powder and slow burning but was wondering if any of you guys are using it and your thoughts.

 

[Eagleye]

So I've decided to switch powders for my PR 300 win mag only because RE22 is becoming harder to acquire. I ordered 8lbs of IMR 9777 [7977??] but all I know that it's a great magnum powder and slow burning but was wondering if any of you guys are using it and your thoughts.

I have an 8# jug of IMR7977, and have built some loads for my 8mm Rem Mag, my 308 Norma Mag, and my 7mm Rem Mag.
However, the only loads I have shot are the 200 AB in my 8mm Rem Mag.....they look very promising, and the 'graph says they are
producing decent velocities, so I will have more to report when I shoot the others.

Regards, Dave.

 

[captainmike]

I am just starting my testing in my 338 lapua improved and it looks promising too
will post my next test in I have some time soon

 

[PitBull1973]

Thanks guys I'm curious to know if there is a velocity improvement

 

[Keithjohn]

Tried it in my 300wm good velocity and accuracy but my barrel got HOT after 5-6 rounds , didn't like that traded the 7797 & went back to 7028

 

[hunter5425]

I've used in my 280 Rem and 160 partitions with very good accuracy and good velocity below the max load, too bad its more pricy than other powders.

 

[Dirtguy]

Tried it in my 300wm good velocity and accuracy but my barrel got HOT after 5-6 rounds , didn't like that traded the 7797 & went back to 7028

I just tried some in a 7mm mag the other day and the barrel seemed to get way hotter then it should after only a few rounds,glad it wasn't just me

 

[RL-300mag]

I tried it in my 300 wm with the 215gr Berger Hybrid's. Had very decent accuracy , good velocity & low ES. But only burnt a pound or so. I found another 12 lb's of H-1000. So I went back to my petload. As for barrels getting hotter with the new powder, I'm pretty slow on the trigger now aday's so can't dis-agree or agree.
One thing that raised a eye brow ,was hearing about a metal spray that is applied to the Enduron powder's to help reduce copper fouling . But I'm not sure on the facts, might be just hear say. I spend a lot of coin on my barrels every year & didn't like the thought of pre-mature wear from a additive for copper fouling, when I don't have copper issue's. Please keep us up-dated with your testing & proven result's. I will add though, my barrels will get hot to when you run a 215gr at 3000fps...