Whitetail312
Well-Known Member
Do you know how to modify the lips or is there a video showing how?
375 ultra mag
- Thread starter Rum and not the liquid
- Start date
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cohunt
Well-Known Member
On what? The cfe-9 or the aics mag?
Cfe9 has a video on the wyatts web page - but you just tap them with a mallet, the aics mags work with um but you have to mill/machine the ribs off so the longer shoulders will fit as they are designed for the 338 lap shorter shoulders
Unknown Munitions makes a detachable mag that is 3.950". It uses its own M5 bottom metal. They sell the bottom metal and the magazines on their website. I'm gonna be trying one on my 375 RUM build.
Whitetail312
Well-Known Member
Is it a 3.950" internal or external?
Since I haven't installed it yet on the build I'm not completely sure. I think it's supposed to be 3.950" internal; guess I need to measure it. When I get home after lunch today I will measure the internal length of the magazine and let you know.
Whitetail312
Well-Known Member
The website says internal. What action are you gonna run that with? Will a regular Remington 700 action be okay?
I will be building mine based off a Bergara Premier series action and a Grayboe Ridgeback model stock, 30" Heavy Palma Bartlein 5R 10 twist barrel. Your stock will have to be cut out to fit M5 bottom metal and I'm pretty sure that there will be an area inside the action that will also have to be milled out just a little bit, more than likely, to run that long of a magazine box. The bolt stop might also have to be modified a little bit too, so to allow the bolt to travel back far enough for it to be able to contact the cartridges in the magazine for proper feeding.
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cohunt
Well-Known Member
The long mags usually require machining of the bottom of the receiver, the bolt stop, and 1/2" off the ejection port (if you want to eject loaded rounds)
The confusing part to me is that it's hard to decipher what "cut" you need for the stock -- r700, m5, obendorf, obendorf m5, obendorf xl, stiller, etc
The confusing part to me is that it's hard to decipher what "cut" you need for the stock -- r700, m5, obendorf, obendorf m5, obendorf xl, stiller, etc
Whitetail312
Well-Known Member
That's also confusing to me as well. Defensive edge is going to build mine so before I order a stock I'll be consulting them
cohunt
Well-Known Member
It might just be the descriptions online-- maybe there are only 2 cuts- r700 bdl and m5 but the descriptions are confusing
The main 2 bottom metal cut outs that you'll see advertised the most are M700 BDL and M5.
What powders are you guys using with the 250-300 grain bullets? I've had good luck with H4350 and RL – 16.
Bearman375
Well-Known Member
H-4831 for me….but all shoot are 260 accubonds and 250 sierra spitz. 101 grain
Barrel length and velocity?
With a 31 inch barrel I'm at 3130 FPS with Reloder 16 and a 270 grain bullet
