375 cheytac finally finished!

pondskipper

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Well, it's been a long years wait gathering parts and pieces but Santa came a little early this year!

Anyone have a good starting load for Lehigh 353 solids in Peterson brass with retumbo powder?
 

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You're gonna have to do better than that! Tell us more about that bad looking rig ya got there.
Mines an improved version, so can't help with the load. I will say that so far I'm pretty happy with the Peterson brass, after I got it fire formed.
 
I run 133 grains of retumbo behind a 350 rmb with bertram brass.
I would think that 125-128 would be a good place to start, but I don't know enough about that bullet to know that for sure.
The bertram brass I have will hold one grain more powder than my peterson (unfired) when I fill them flush. I know this isn't the most accurate way of doing this, but it does tell me that the case capacity is less than 1% different.
When I switch to the peterson brass, I'll back off to 128 to be safe, but I'm sure I'll end up back at 132-133.
It's hard to find good info on this, so I'd thought I'd throw that out there, you can take it for what it's worth.
Good luck with it, that's a beautiful rifle.
 
One other thing to note.
I have noticed some variations between lots of retumbo, so If you haven't bought already, buy a bunch of the same lot so you don't have to mess with it when you run out of one, your going to burn a bunch of this stuff, but it's worth every penny! When your running this much powder, it can really change things.
 
The bertram brass I have will hold one grain more powder than my peterson (unfired) when I fill them flush. I know this isn't the most accurate way of doing this, but it does tell me that the case capacity is less than 1% different.
Switching from Bertram to Peterson I had to drop my powder charge down 2 grains to get the same velocity, this is with RL50.

I have the same action with Baer bottom metal/mag...pretty standard stuff.:D Let me know how the Lehigh feeds from the mag. The Chinchagas I use for hunting will not, they are too sharp at the tip and try to dig in. The Hammer Hunters and CEB Lazers I've tried feed fine.
 
26.8lb with the atlas but will go up as soon as the all steel elite iron revolution comes in.
 
Very nice rifle pondskipper, it should shoot well for you.

Cheers
Osoh
JH
 
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