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375 DCM, 375/408imp

 
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  #1  
Old 10-08-2012, 08:25 PM
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Join Date: Nov 2008
Location: Nelson, New Zealand
Posts: 289
375 DCM, 375/408imp

I thought I would put this here as this cartridge is for ELR.

I have been firing my 375 DCM, 375/408 Cheytac improved for a little while so I thought it was time I put some info up about it.
The case was designed by a fellow Kiwi, Rocky Mountain, he also specified the barrel which is a 32" gain twist Bartlein 12-7.25.
We had been waiting for these barrels for ages, they were supposed to be here before last Christmas....
She has an XLR HD Chassis, Barnard P-Chey action, 30 moa rail, Terminator muzzle brake, 5.5-22 x 56 NF NSX scope
I haven't managed to shoot any great distance with her yet, the weather hasn't been helpful & the fact that my usual LR range is closed due to forestry operations....
I have decided to use the CE 425 pills that I asked Daniel at Cutting Edge to design & make for me in February this year, to use in the 375 Terminator & DCM.
I will do more testing with the 375s & 400s but I'm very happy with how the 425s are going
I haven't tested the BC of the 425 much yet but it did dial accurately out to 625 yards using 1.04 & I used 0.99 for the 400s out to 1700 yards in my 375 Terminator ( formerly Lil'Terminator)
Here is a picture of her at the range.

I have designed the T5 Terminator muzzle brake for it which works very well.

I have tried a few powders in her & have decided that even though US869 gives me more velocity the temperature sensitivity, ES & accuracy aren't what I'm happy with, so I'm using ADI 2218/Hodgdon 50BMG.
Here is a picture of a 338 Norma, 338 Lapua, 375 DCM, 425 Cutting Edge pill, 223 for size comparison.

I am still only neck sizing my cases & they have been fired 4-5 times so far with very little head expansion
Here is a group at 217 yards.

Here is one with another grain of powder.

As you can see she is showing heaps of potential, the ES is pretty good & should be able to be improved upon.
We are happy with the speed & have been over 3100 but haven't settled on a load yet.
More fine tuning to do to see what see likes at distance, good times
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  #2  
Old 10-10-2012, 05:09 PM
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Join Date: Oct 2010
Location: Norway
Posts: 69
Re: 375 DCM, 375/408imp

I am very impressed with your gun. Congratulations

I live in Norway, and I am planning a new long range gun. I currently shoot a 338 LM. I have shot it with good results out to 2000 meters.

I have been looking at the 408 CT, but the police did not want to give me a permit for that caliber. But a 375 caliber gun, would be fine.

Could you tell me more about this specific caliber, is it easy to find good bullets? Who makes the action? I know Barnard is shipping to Norway, maybe that's the way to go for me?

Any info is highly appreciated.

Please keep us posted on your project
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  #3  
Old 10-10-2012, 06:38 PM
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Join Date: Jan 2004
Location: Blackfoot, Idaho
Posts: 8,178
Re: 375 DCM, 375/408imp

Very nice!!!!

Questions:

What's the weight advantage of the stock/chassis you are using compared to a McMillan A5?

What powder and how much of it are you using?

I'm shooting a 375 Allen Mag and am limited to (so far) to 350 SMKs. But they do shoot very well @ 3200 MV

Regards

Roy
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Old 10-10-2012, 10:00 PM
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Join Date: Dec 2007
Location: New Mexico
Posts: 65
Re: 375 DCM, 375/408imp

Are the gain twist barrels readly avaliable?
Are the 375,400,425 pills also avaliable?
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  #5  
Old 10-11-2012, 02:13 AM
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Join Date: Nov 2008
Location: Nelson, New Zealand
Posts: 289
Re: 375 DCM, 375/408imp

Quote:
Originally Posted by paul2atlo8 View Post
Are the gain twist barrels readly avaliable?
Are the 375,400,425 pills also avaliable?
The Barrels took ages to get as mentioned in the post, contact Bartilen about lead times, it may have been the exporting side of things that slowed them down...

The bullets should be easy enough to get contact Cutting Edge for info on distributors
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Old 10-11-2012, 02:18 AM
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Join Date: Nov 2008
Location: Nelson, New Zealand
Posts: 289
Re: 375 DCM, 375/408imp

Quote:
Originally Posted by royinidaho View Post
Very nice!!!!

Questions:

What's the weight advantage of the stock/chassis you are using compared to a McMillan A5?

What powder and how much of it are you using?

I'm shooting a 375 Allen Mag and am limited to (so far) to 350 SMKs. But they do shoot very well @ 3200 MV

Regards

Roy
The XLR chasis is 2-3lbs heavier than my A5 with an alloy bedding block in it for the Barnard action.

I'm using 50 BMG 150+ grains.

I can't shoot the 350 SMKs in this rifle the exit twist will be too hard on them
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  #7  
Old 10-11-2012, 08:18 AM
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Join Date: Jan 2004
Location: Blackfoot, Idaho
Posts: 8,178
Re: 375 DCM, 375/408imp

Greg,

Thanks for the answers.

'nother question:

I know nothing about those bullets but seem to gather that they are 'bore riders' with seating dependent upon the "ring".

My rig is single shot. Except for extracting a loaded round, can I load and use those things?

Oh! 'nother question: Mine is a 10 twist. Will at least the 375 grain offering work?
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