What other powders besides Retumbo do you guys use for Cheytac cartridges? Any luck with Alliant powders? I tested one recipe with H50BMG and 375 grain projectiles that had decent results and I was curious to see if there are other viable powder options out there?
Other Cheytac powder options
- Thread starter jbs2014
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I have used RL33 with great results in a .408 and a .375 Snipetac. RL50 has been real good for the .375 as well. I'd like to get my hands on some IMR 8133. Would also like to try Peterson brass and 400/425 CEB Lazers (with RL50).
Just to clarify, it's a Snipetac (Cheytac Improved).
It was the 375 grain Chinchagas (HBN coated). With the coated bullets I couldn't get enough powder in the case to cause pressure sign. The load I settled on was 155 grains @ 3125 (30" barrel). Here is a 100 yard group (bottom) and the largest of 3 groups fired at 800 yards.
It was the 375 grain Chinchagas (HBN coated). With the coated bullets I couldn't get enough powder in the case to cause pressure sign. The load I settled on was 155 grains @ 3125 (30" barrel). Here is a 100 yard group (bottom) and the largest of 3 groups fired at 800 yards.
Attachments
Those are some nice groups, I got a 375 Grain bullet up to 3100 FPS with my 375 Cheytac and its 29" barrel but that load, even with a decent ES (11 FPS) and group (1/3 MOA) had some pretty serious pressure warnings (I had extractor marks on the base, flattened and cratered primers). That was with 136 grains of Retumbo. I ran 138 grains of H50 BMG with no pressure signs and a slightly worse ES (15 FPS). But I was only able to get 2905 FPS. Those bullets seem to like to go fast.
So, do you think RL33 can get me to 3000 FPS safely?
Thanks again for you time
If you are getting 2900 safely with 50BMG then I think you may be able to get close to your intended velocity with the faster burning RL33. Haven't tried Retumbo in this chambering. I did get at least 100 fps velocity increase going from Retumbo to RL33 in a .408 Cheytac.
What 375 grain bullet you loading? The Chinchagas are nasty on large game.
What 375 grain bullet you loading? The Chinchagas are nasty on large game.
They seem to be the same design as the Chinchagas, so I would imagine the external and terminal ballistics are very similar (if not the same).
I was using a .8 g1 BC out to 1300+ yards.
What brass you running? I've used the Jamison 2 star and Bertram. Of the 2 Bertram seems superior, hoping the Peterson is better still.
I was using a .8 g1 BC out to 1300+ yards.
What brass you running? I've used the Jamison 2 star and Bertram. Of the 2 Bertram seems superior, hoping the Peterson is better still.
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I have 150 pieces of Peterson Brass and a large (uncounted) quantity of Bertram brass. The Peterson Brass held up nicely to that super high-pressure Retumbo load that I mentioned earlier. I have never had to trim new Peterson Brass all of mine was within .001.
