Corey James
Well-Known Member
Single feed running 3.850" AI Mags with Mannera T4A Stock and mini chassis
375 ultra mag
- Thread starter Rum and not the liquid
- Start date
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I use a March 2.5-25x40 Tactical. Outstanding scope. Light, insanely clear, tough and tracks perfect. No regrets. My next rifle will have the same only in 52mm obj.. In my experience with any high(20x+) vari-power scope you can run into some eye box issues. Not that's there's anything wrong, just that scopes can get pretty finicky on the high end. I find it just takes a little practice to figure out the scope you choose. Some are better than others or they just don't suit your shooting style. You'll find one that works. I'd consider putting March on your list. I've had no trouble with eye box or anything else at any distance with March.
In my rifle with a 27" Benchmark, it only takes 96.7gr of RL26 to hit 2810fps, which is My elk hunting load. There's tons of room left there for more, even with the relatively fast for case size, RL26 magic dust. What a wonderful powder!! very versatile.
If I used Retumbo, RL33 and N570, I'm sure 2900+ would be a walk in the park. especially with the longer barrels You all are looking at. RL33 I believe will be the ticket. You can get some crazy velocity out of that stuff. It's stable to. I used to shoot 99gr of Retumbo with the 350gr SMK at 2815fps. There were no high pressure signs and could have gone further. Very accurate (6"groups avg at 900yards). I've never been one to chase speed. I always want my brass to last as long as possible so I tend to hang around 2750-2850fps. Nice and easy on brass, accurate, hits elk with authority and with my rifle scope combo, I can get it out to 1500yds before it goes subsonic at those speeds.
Corey James
Well-Known Member
I agree. I own March. It was always on my list.
The 10-60x56mm was a huge disappointment in glass quality at 1200y that acquisition hurt. I was told by my DM to get the NF ATACR 7-35mm. I did and went back to the 5-25x56mm Leupold HD. Better at high end, far enough power. You need clarity more than power and the March high power at 1500y was so disappointing and the only reason I did not look again at March. The lower powered March optics are killer.
Truth be told the best 2 mile optic I ran on my 338s were the Schmidt-Bender hands down over Kahles 5-25 x.
The clarity of March lower power rival top end NightForce any day.
To choose an optic for this monster 375 RUM AI one has to realize these qualities of the build:
1. The 375 RUM AI is NO 1 mile let alone 2 mile weapon. Far too anemic despite CEB and Hammer bullets. I built it for being a sledge hammer inside of 600 yards.
2. If I wanted a 1500- 3700 yard .375 caliber weapon I would have chambered this build in a 37XC or 375 CT. 375 RUM and RUM AI simply is limited despite the performance of accuracy and velocity I am seeing in my 29" 1:9.4" twist barrel.
3. This is an M24 Contour 29" barrel so this not a Safari Grade big game short barrel so low power safari optics are not a good fit for wide field of view or eyebox needs.
4. This rifle has a Manners T4-A stock built for more mobile Safari and fixed stand or ELR shooting & hunting only.
So looking at this lower power March is indeed an option with larger objective.
The 10-60x56mm was a huge disappointment in glass quality at 1200y that acquisition hurt. I was told by my DM to get the NF ATACR 7-35mm. I did and went back to the 5-25x56mm Leupold HD. Better at high end, far enough power. You need clarity more than power and the March high power at 1500y was so disappointing and the only reason I did not look again at March. The lower powered March optics are killer.
Truth be told the best 2 mile optic I ran on my 338s were the Schmidt-Bender hands down over Kahles 5-25 x.
The clarity of March lower power rival top end NightForce any day.
To choose an optic for this monster 375 RUM AI one has to realize these qualities of the build:
1. The 375 RUM AI is NO 1 mile let alone 2 mile weapon. Far too anemic despite CEB and Hammer bullets. I built it for being a sledge hammer inside of 600 yards.
2. If I wanted a 1500- 3700 yard .375 caliber weapon I would have chambered this build in a 37XC or 375 CT. 375 RUM and RUM AI simply is limited despite the performance of accuracy and velocity I am seeing in my 29" 1:9.4" twist barrel.
3. This is an M24 Contour 29" barrel so this not a Safari Grade big game short barrel so low power safari optics are not a good fit for wide field of view or eyebox needs.
4. This rifle has a Manners T4-A stock built for more mobile Safari and fixed stand or ELR shooting & hunting only.
So looking at this lower power March is indeed an option with larger objective.
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Corey James
Well-Known Member
Well said. If you chase speed go up in cartridge 37XC or 375 CT
Corey James
Well-Known Member
Gotta love Benchmark Barrels!!
Yeah, when you get into strictly and 1-2 mile Rig, I'd be looking beyond any of these scopes. The march 10-60 was and is a 1000yd benchrest scope. A very good one and very popular. Out to 2 miles, I have no double you'll lack some clarity. Enter the March Genesis..
https://marchscopes.com/column/king-of-2-miles-in-france-2019/
Corey James
Well-Known Member
I have built hundreds of rifles in just the last year as a professional builder. To me $ for $ no other barrel is better than Benchmark.
If you have a personal preference I will not ever bash your choice but I literally have owed all other brands and can nearly 100% assured you I tried all brands.
The Benchmark was the first barrel that I built for my own personal 338s and 375s and from receipt of the barrel to installing on custom actions to Rem 700 factory actions the accuracy was mindblowing. Putting 3 rounds down range from a brand new barrel and having that massive 350 SMK group in a cloverleaf at 200y convinced me.
From that point on no other barrels go on my builds.
We will put ANY barrel of choice a customer chooses I just let them know I wont guarantee subMOA with anything but Benchmark.
We do all brands of barrels. Over .308 caliber I am turned off on Proof Research Barrels however.
biff's reloading
Well-Known Member
- Joined
- Jun 12, 2006
- Messages
- 360
Corey, what is different about your 375? My sammi chamber and throat was hot hot at 101gr mrp with 285gr grand slam and just over 3k. 105gr with a 350 would be disastrous I'm afraid. Bertram brass, fed primer. (116gr mrp is a full case). I'm cutting my throat to .400 to address this, but looking for any bright ideas. I'd love to just send the barrel for "+p", but doing my own work is how I justify all this shop equipment to the boss 
I may have to send him one just to find out what the heck it really is... im sure its not magic, just a long leade
I may have to send him one just to find out what the heck it really is... im sure its not magic, just a long leade
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bigngreen
Well-Known Member
Wait till they have a bad batch of heat treat and they don't want to do anything about it and you eat 30-40 barrels!!
Rum and not the liquid
Well-Known Member
So I'm seeing a lot of 37xc stuff at the mo which has put a spanner in the works. The question is do I still keep going on with the 375 rum or change it to xc?
Corey James
Well-Known Member
Stick with the 375 RUM. Here is my baby all done! THIS BITCH RUNS!
Bayou Advanced Weapon Systems, LLC. M24A2-A375 Overwatch Extreme 375 RUM Progressive-Twist .375 Cal.
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