7mm-375 build???

[Scalloper]

I first want to say I am new here and find this to be a great site. I have been reading allot of great infomation on this site.
I have owned a 7mm Mag in one rifle or another for years. I hunt deer,bear and moose mostly. I have been tossing around building a 7mm-375 Ruger after reading about them recently. This would be a project that I may do in the next year or so. So where do I start as in what platform should I look for? Looks like some use the 700 Rem rifle which I have but its in 270. Any other options I may want to consider? Thanks

 

[Scalloper]

I also have a Remington 1903A3 thats like new in 30/06. I saw one on GB in 375 Ruger so I asume this one could be rebarreled in 7mm-375?

 

[Scalloper]

I read this on the 375.
The .375 Ruger uses a unique case designed by Hornady and Ruger. The case is of a rimless design having the base and rim diameter of .532 in (13.5 mm) which is the same diameter of the belt on belted magnum cases based on the .300 H&H Magnum and .375 H&H Magnum. This allows the cartridge to have a greater case capacity than a belted magnum case given cases of equal length. As Ruger intended the cartridge to be chambered in standard length bolt action rifles[2] the case length was kept to 2.580 in (65.5 mm) which is only .04 in (1.0 mm) longer than the .270 Winchester case. The maximum overall length of the cartridge is 3.340 in (84.8 mm) which is similar to the maximum overall length to standard length cartridges such as the .338 Winchester Magnum or the .30-06 Springfield. Unlike Remington Ultra Magnum cartridges, the Ruger Magnums can be chambered in standard length bolt action rifles. This allowed Ruger to chamber the cartridge without extensively redesigning their M77 rifle platform to adopt them to the new Ruger cartridge.


So if this is right many platforms that will shoot the 30/06 or .270 could be refit for a 7mmX375? Is there anything that I am missing?

 

[AlanPF]

Scalloper,

You've probably got your heart set on this as a wildcat project - but have you considered the 7mm Blaser Magnum? Seems very similar in performance and dimensions without all the work of bringing the neck down from 375 to 284, and will probably be easier to get dies etc.

Alan

 

[abishai]

nope . Think magnum bolt face .........

 

[AlanPF]

nope . Think magnum bolt face .........

abishai,

Not sure if you're saying "nope" to my suggestion? 7mm Blaser has a 0.535" rim diameter, virtually identical with the 375 Ruger if the figure mentioned above (0.532") is correct.

 

[benchracer]

I read this on the 375.
The .375 Ruger uses a unique case designed by Hornady and Ruger. The case is of a rimless design having the base and rim diameter of .532 in (13.5 mm) which is the same diameter of the belt on belted magnum cases based on the .300 H&H Magnum and .375 H&H Magnum. This allows the cartridge to have a greater case capacity than a belted magnum case given cases of equal length. As Ruger intended the cartridge to be chambered in standard length bolt action rifles[2] the case length was kept to 2.580 in (65.5 mm) which is only .04 in (1.0 mm) longer than the .270 Winchester case. The maximum overall length of the cartridge is 3.340 in (84.8 mm) which is similar to the maximum overall length to standard length cartridges such as the .338 Winchester Magnum or the .30-06 Springfield. Unlike Remington Ultra Magnum cartridges, the Ruger Magnums can be chambered in standard length bolt action rifles. This allowed Ruger to chamber the cartridge without extensively redesigning their M77 rifle platform to adopt them to the new Ruger cartridge.


So if this is right many platforms that will shoot the 30/06 or .270 could be refit for a 7mmX375? Is there anything that I am missing?

No. Your 270 Rem 700 action will not work. You need a magnum action with a magnum bolt face. You could get a magnum bolt for your standard 700 LA, but then the magazine will be too short to seat any heavy weight bullets with good BCs to get the potential out of the round. Youd have to shoot it single shot.

Last year I built a 338-375 Ruger and I used a 700 action from a 300 Ultra Mag. Works very well but I still cant seat my 250gr Berger Elite Hunter bullets to the lands and have them fit in the mag. No big deal though because even with them seated way back its still a solid 1/3 MOA rifle. Shot two deer this last fall with it as well. Two shots fired, two dead animals. Quite the hammer

Look up info on the 7mm Long Range Magnum (LRM) It is basically a 7mm-375R with a longer neck.

Just remember that you will jeed a magnum action. Something that was made for the 300 win mag, 7mm rem mag, or ultra mags.

You could even take a 7mm Rem Mag rifle and simply re-chamber the factory barrel if you didnt want to buy a new barrel.

Where action length is concerned, this is not correct. The Remington 700 comes in only two action lengths, short and long. The only differences between a 30-06 type long action and a magnum long action in a Remington 700 are the bolt face and feed rails. The bolt face and feed rails would have to be modified if the base long action is a non-magnum type.

Any Remington 700 long action will handle cartridges up to approximately 3.6" in length. Longer than that if a Wyatt's mag box is installed. The .375 Ruger case was designed with a COAL of 3.340" in mind. Even using long 7mm bullets, you would have about .260" to play with using the standard magazine box. There is plenty of room in a Remington 700LA for a .375 Ruger based cartridge.

Distance/COAL to the rifling (and whether or not your rifle can function as a repeater) will have more to do with how your smith cuts and throats the chamber than with the cartridge itself.

 

[Scalloper]

Scalloper,

You've probably got your heart set on this as a wildcat project - but have you considered the 7mm Blaser Magnum? Seems very similar in performance and dimensions without all the work of bringing the neck down from 375 to 284, and will probably be easier to get dies etc.

Alan

No I have not. I will check them out. Thanks

 

[Scalloper]

I saw a Remington 1903 in 375 Ruger on Gun Broker. I have a 1903 a3 in 30-06 would this action work?

 

[GSPV]

I also have a Remington 1903A3 thats like new in 30/06. I saw one on GB in 375 Ruger so I asume this one could be rebarreled in 7mm-375?

Besides everything else, why in the world would you use a 1903A3 in like new condition for a donor?

Sell it to an 03 collector, take the money, send it to Jim Borden and have him build you what you want on his Alpine long action. If Jim says "why don't you do this?", do it. You will come out far, far ahead.

Http://www.bordenrifles.com

 

[BigDMT]

I saw a Remington 1903 in 375 Ruger on Gun Broker. I have a 1903 a3 in 30-06 would this action work?

No. Get a longer action or you'll be sorry. Whoever built that on a 1903 didn't have a clue and they are probably selling it because they know they messed up. AND THE 30-06 IS NOT A MAGNUM BOLT FACE! it is .473". The 375 uger case is .532".

Benchracer, you know nothing about 700 actions so please be quiet. You're not helping. I have built on the 375 Ruger case using an Ultra Mag 700 action. I'm not just spitting this stuff out from what I read on the internet.

The 700 action designed for the 300 Ultra Mag allows the bolt to travel rearward farther and has a larger magazine than the Standard or Magnum action. If they were all the same, Brownells would not sell 3 different long actions separately.

He can use a normal 700 magnum action, but I recommend using the 700 action designed for the 300 Ultra Mag for more bullet seating room. Trust me, if you plan on using the 168gr or 180gr Berger VLD's in the 7mm-375R as you should, you will be very limited on seating depth in the magazine if you do not go with the Ultra Mag 700.

 

[benchracer]

If you know what you claim to know, then you know that a 30-06 length action is all that is necessary to build a .375 Ruger based cartridge. Your assertion that a standard 30-06 action will not work for such a build is false. Period. Regardless of what you can do with a RUM action. If you know as much as you say you know, then you are aware that you are giving out inaccurate information. GFY!!!!!!!!!

 

[Scalloper]

I also have a Remington 1903A3 thats like new in 30/06. I saw one on GB in 375 Ruger so I asume this one could be rebarreled in 7mm-375?

Besides everything else, why in the world would you use a 1903A3 in like new condition for a donor?

Sell it to an 03 collector, take the money, send it to Jim Borden and have him build you what you want on his Alpine long action. If Jim says "why don't you do this?", do it. You will come out far, far ahead.

Http://www.bordenrifles.com

Great advice. I realy need a knowledgeable smith to put this together for me. Thanks

 

[Scalloper]

I also have a Remington 1903A3 thats like new in 30/06. I saw one on GB in 375 Ruger so I asume this one could be rebarreled in 7mm-375?

Besides everything else, why in the world would you use a 1903A3 in like new condition for a donor?

Sell it to an 03 collector, take the money, send it to Jim Borden and have him build you what you want on his Alpine long action. If Jim says "why don't you do this?", do it. You will come out far, far ahead.

Http://www.bordenrifles.com

I have the gun and may not use it in its current caliber. Its a custom not a original but in like new condition

 

[mr45man]

Using a 03 action just does not seem practical
As was mentioned, sell it and buy a custom action made for the
magnum round.It will be ready for a scope/ jewel trigger
good lock time/bolt will most likely be timed.trued
And you will not have to think about the action holding up
every time you get behind it and light the monster off :-\.
John H.

 

[Scalloper]

Thanks I have put the 03 for sale trying to get $500 for it with the scope.
I found a NIB Model 70 Alaskan in 338 WM for $1000. That may be a option :-\

 

[BigDMT]

If you know what you claim to know, then you know that a 30-06 length action is all that is necessary to build a .375 Ruger based cartridge. Your assertion that a standard 30-06 action will not work for such a build is false. Period. Regardless of what you can do with a RUM action. If you know as much as you say you know, then you are aware that you are giving out inaccurate information. GFY!!!!!!!!!

Like I said. You are still not helping and proving further that you know nothing. Sure it will "fit" in a 30-06 length action, but you'd be very limited to only lightweight low BC bullets.
Nice mature comment at the end there. Good old keyboard bravery : Hows about you go "misdirect" people on how to build rifles on some other site.

My advice will get him the rifle built "properly" so that he can utilize the full potential of the 7mm-375 Ruger with high BC bullets like the 180gr Berger VLD.

 

[BigDMT]

Thanks I have put the 03 for sale trying to get $500 for it with the scope.
I found a NIB M77 Alaskan with the Boss barrel in 338 WM for $1000. That may be a option :-\

WOW! Have you not heard a thing I said? This is a lost cause..... Screw the build up if you want, it's your money and your misery. I'm done here

 

[Scalloper]

Thanks I have put the 03 for sale trying to get $500 for it with the scope.
I found a NIB M77 Alaskan with the Boss barrel in 338 WM for $1000. That may be a option :-\

WOW! Have you not heard a thing I said? This is a lost cause..... Screw the build up if you want, it's your money and your misery. I'm done here

Yes sir I did. The 700 action from Brownells is $595 and I could get the Model 70 Alaskan 338 for $1000. I was not sure if the Model 70 with just a barrel may be a option.

 

[wwbrown]

I built a 30-375 on a 30-06 length Howa action designed to shoot heavies. The rounds work in the mag with 220 g bullets 0.020" into the lands with no loss of powder capacity. I built my 375 Ruger on a 30-06 length Rem 700 and the rounds also function fine in the magazine. People are doing the same with Mauser 98's which is little shorter by milling the front of the magazine box on the bottom metal, the only mods to the action are a widening of the feed lips.

Maybe the 7mm - 375 Ruger will have longe COAL's than the above and need a longer action I don't know.

As an aside I would wait until the 260 Nosler hits the shelves as you will probably get better brass and a much closer diameter on the parent cartridge. I wish my 30-375 Ruger would have been built a year later as I would have gone 7mm Nosler. I have compared the reamer prints of the 375 Ruger and the 260 Nosler and if the brass is of comparable thickness between the two the case capacity will be very close and probably not seen in performance. Call Dave Kiff up at PT&G and he will set you up with a reamer as he did the original 260 Nosler.

Hope it helps,