Home Forums Reloading Big Game Rifles IMR 8133

Looks like a new powder is coming in February that is going to get the 7 REM MAG to where it should be. IMR 8133
Check out these numbers from a 24" barrel on the Hodgdon data site:

140gr Partition start 71.8gr 2,940fps 46,200 PSI MAX 78.0Cgr 3,217fps 58,100 PSI OAL 3.25

160gr Partition start 69.8gr 2,820fps 48,800 PSI MAX 75.0Cgr 3,035fps 59,400 PSI OAL 3.29

175gr Partition start 66.2gr 2,683fps 50,200 PSI MAX 71.2Cgr 2,879fps 59,400 PSI OAL 3.29

Looking very forward to getting my hands on some.

Interesting....appears to be right around RL-33 territory. A touch slower than Retumbo.

Need to try some in my 7 Mashburn

All these new powders coming out... and doing what H 1000 has been doing for decades...

You could go to the Hodgdon data site and compare.
They claim 8133 tops H 1000, and basically everything else, by a full 200 fps in every bullet weight.

Somehow pressure and velocity are related. I don't think you are going to find 3200 FPS and a powder doing that with 35,000 PSI.

Pressure and velocity are related but it's indisputable that some powders can get higher velocities with a given bullet, at the same pressures.

according to the marketing dept...

Indeed. We shall see.

3200 fps is listed as 58,100 PSI.
Not sure where you get 35,000 PSI?

It is an analogy only. Some people think that there is unlimited velocity/load combination that hasn't been discovered yet. Those same people think that you can get a car than could get 110 MPG, you just need to be more efficient, but physics does step in and limit just how far you can go.

Win,

don't interpret my posting as a negative against trying it...

If it works for you, I wouldn't let what others think spoil your fun....

I've tried several newer powders, that were the latest greatest rag in the past year...

RL 26 being the most recent...

For velocity, it really didn't give me anything more than H 1000 did, in a wide variety
of cartridges....and often less velocity...

For accuracy, the higher the velocity, the accuracy with RL 26 fell off, in cartridges from
243 to 300 Win Mag...

H 1000 still beat RL 26 in each of those rifles, with Heavy bullets for accuracy and velocity...

I can say RL 26 was REAL ACCURATE in the 223, with heavy bullets,
although I am sure velocity didn't set the world on fire...

but we all have different experiences and results...

heck I look forward to you posting your experiences...and results..

and to be perfectly honest, I'd take the real world results you report, a lot more seriously
than what I'd take out of the marketing department...of any company...

I'm with you on the latest and greatest. Even as a meticulous hand loader, I've never been one to split hairs.

My go to rifle powders are still IMR 4064 and IMR 4350. Have not even thought of buying any of the new powders as data showed no velocity gain to speak of, and I'm more than happy with the accuracy I've been getting for some 30 years.

But, when this new 8133 data shows a gain of 200 fps for the 7 RM, that caught my eye. That will make me bite.

Here's to hoping it's true, and accuracy doesn't suffer.

Results coming next spring.

I’m an IMR 4350 guy myself. A little bit more velocity isn’t going to kill a deer or pig any more dead. 65 grains of IMR 4350 powder will push a 140 bullet clean through a deer at 600 yards. We had a water trough on a lease in Ozona, stand was on a hill. That was fun shooting. Game traveled for miles for water. Couldn’t hit them until the Redfield accutracs came out. This was in the late 70’s. Back in the good old days!

Alliant is claiming a tiny bit more velocity with RL-26 than Hodgdon is with IMR8133.

For me IMR 7977 didn't produce the velocity Hodgdon lists with the 243 and 270. My loads weren't particularly accurate either. Maybe 8133 will do better.