.375 cheytac load advice

[AZ_tactical]

I’m almost done with my cheytac build! I figured it was time to get some powder ordered. It looks like it’s still impossible to find retumbo or VVN570. Has anyone used RL33 with 350gr bullet? Or does anyone know of any other good substitutes. I’ll be shooting CE 350gr MTH.

 

[xdeano]

I had a he'll of a time finding vv570, but I did find 10, 1# retumbo all match, it's been really good with the 350 lazers so far. I just started loading for the 375ct also.
130grns of retumbo
Fed 215m
350grn ce lazer
Bertram brass
3050fps out of a DTA HTI.
Xdeano

 

[MACHTECH]

Did somebody say Retumbo?

 

[MACHTECH]

I’m almost done with my cheytac build! I figured it was time to get some powder ordered. It looks like it’s still impossible to find retumbo or VVN570. Has anyone used RL33 with 350gr bullet? Or does anyone know of any other good substitutes. I’ll be shooting CE 350gr MTH.

Any reason you're choosing the MTH by CE instead of the Laser? If you plan on hunting with it, the laser is still a great hunting bullet! We have seen better performance from the lasers both in 350 grain with a 1:10 twist and the 400 grain with a 1:7 twist.

 

[MACHTECH]

I just remembered that I have this. This shows the expansion of the 400 grain lasers.

 

[GIXXER2000]

I am running the 400 Lazer CE with 129.3gr of N570. But i would think if you plan on using the 350 CE or other 350ish gr bullet you could use N565 which is slightly fast burn the N570 and should work well for the lighter bullet. Powder Valley has a bunch of N565 in stock (just looked) and this is an option.

 

[secondofangle2]

Max with 352 CEB in every barrel I’ve owned in Bertram is

134 w n570
132 w retumbo
High 130s w rl33

 

[WaltHer]

Max with 352 CEB in every barrel I’ve owned in Bertram is

134 w n570
132 w retumbo
High 130s w rl33

+1

 

[AZ_tactical]

Max with 352 CEB in every barrel I’ve owned in Bertram is

134 w n570
132 w retumbo
High 130s w rl33

How do you like the rl33 as far as velocity and grouping?

 

[AZ_tactical]

I am running the 400 Lazer CE with 129.3gr of N570. But i would think if you plan on using the 350 CE or other 350ish gr bullet you could use N565 which is slightly fast burn the N570 and should work well for the lighter bullet. Powder Valley has a bunch of N565 in stock (just looked) and this is an option.

I might give that a try. Any suggestions for a starting load with that? Haven’t used any VV powders before.

 

[JB.IC]

I might give that a try. Any suggestions for a starting load with that? Haven’t used any VV powders before.

What city are you located at in AZ? I just got my ELR rifle built and I live near Ben Avery and was looking for others that shot ELR to shoot and train together.

 

[GIXXER2000]

For the N565 i would start at 127 or 128 the work up in 1 grain increments. I would think you would end up around 131 to 135 just depends were the node is.

 

[6XC243]

Any suggestions for a lead core load for 350g bullets? Looking for splash effect on steel at 2k+ distance. Its hard to see solid impact at that distance (for me anyhow).

 

[6XC243]

Any suggestions for a lead core load for 350g bullets? Looking for splash effect on steel at 2k+ distance. Its hard to see solid impact at that distance (for me anyhow).

 

[secondofangle2]

350 SMK w 132 RETUMBO MAX or 134 N570, same as 352 CEB

That’s Bertram brass

Can’t find rl33 anymore

N570 smoked one of my barrels in 700 rounds

 

[6XC243]

What about this brass?

 

[secondofangle2]

Thats the LEAST desirable of the Cheytac brass.

Necks will split after 2-3 firings if not annealed, pockets will loosen quickly with loads well under max in other brass

I wouldn’t shoot it if you gave it to me free nowadays

But 10-15 years ago we shot it bc it was all we could get

 

[6XC243]

Thats the LEAST desirable of the Cheytac brass.

Necks will split after 2-3 firings if not annealed, pockets will loosen quickly with loads well under max in other brass

I wouldn’t shoot it if you gave it to me free nowadays

But 10-15 years ago we shot it bc it was all we could get

Cool, thanks for the info. I will be sure to aneal it.. thanks for the input. I have some Retumbo and 350g SMKs. What primers do you suggest?

 

[secondofangle2]

The go to primer is federal 215M because it’s the hottest primer which you need to ignite that large powder column. You might be able to use any large rifle magnum primer like CCI 250 or even a Remington, but I would try to use 215M.

I have had occasional hang fires, especially in cold weather, even with 215M

 

[6XC243]

The go to primer is federal 215M because it’s the hottest primer which you need to ignite that large powder column. You might be able to use any large rifle magnum primer like CCI 250 or even a Remington, but I would try to use 215M.

I have had occasional hang fires, especially in cold weather, even with 215M

Thanks, we will be shooting the lions share in May so hopefully it wont be to cold. But on the other hand i will be working DOPE@ sub 32degf.