IMR 8133 for Cheytac 375

justbill

Private
Minuteman
May 14, 2018
4
2
I was reading an old thread about substitute powders for Retumbo. One member asked the question: Has anyone tried using IMR 8133 for 375 Cheytac loads? Did not see any answers, so I would like to ask the question once more. Anyone using IMR 8133 to load 375 Cheytac?
 
What bullet are you shooting?

IMR 8133 should be pretty good in a .375CT, from what QL is telling me.

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I used the Cutting Edge 352gr because it was a very common bullet for .375CT. I have no experience with the IMR 8133, but according to burn rate charts, it's similar to Retumbo, RL33, and N570.

Now take this all with a little more than a grain of salt, but using QL for an educated guess, I'd say you're probably safe (using the above specs) from 129gr to 136gr.
 
Thanks Dogtown. I was planning on using Cutting Edge 352gr to start experimenting with the load. I will give 8133 a try, perhaps starting around 125gr for a few rounds just to check pressures.
 
Thanks Dogtown, running 377 MTACS for sure, and considering the 353 Lehigh and/or 361 FL.
BMG seems to get the top speeds at the cost of throat wear? 8133 and 20N29 seem like much cooler burning powders according to QL?