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?
- Thread starter justbill
- Start date
Bumping this to see if anyone has a substantive response. Inquiring minds want to know due to the absolute unavailability of Retumbo.
up top... have some inbound...starting load suggestion? I am guessing 1gr off of Retumbo?
What bullet are you shooting?
IMR 8133 should be pretty good in a .375CT, from what QL is telling me.
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.
IMR 8133 should be pretty good in a .375CT, from what QL is telling me.
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.
I run N570 at 131.5 with 400 CE Lazer bullet AVG FPS 3060/ sd 6.5 in a 34 in 1-7 twist barrel. Never tried 8133 but have shot with guys using H -BMG 50.
There's some BMG50 and RL 33 near me. If you're looking for it. I'm sure we could work something out
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?
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?
How far off the lands are you seating your bullet?
I load 5 off... tried 10 and 15 but the CE bullets seem to like being just off the lands the best.
Berger 407g
N570 - 131.5g
Avg speed 2,943 FPS.
SD 5.5
EXCELLENT GROUPING (1/4 moa)
N570 - 131.5g
Avg speed 2,943 FPS.
SD 5.5
EXCELLENT GROUPING (1/4 moa)
