7 mm lrm

[maddysdad]

hi,
has any one used the gunwerks round that is based on the 375 ruger for 1000 yard shooting yet?
i thought it not having a belt and a 30 degree shoulder might be a good round given its volume and design.
gary b

 

[PRECISIONWELDING01]

I would say look at 7mm RSAUM but brass is unobtainable right now

 

[nastynatesfish]

I think I'd do a STW over the LRM. Not really a big reason but I don't see the added benefit

 

[BigDMT]

I think I'd do a STW over the LRM. Not really a big reason but I don't see the added benefit

There are many added benefits actually...

The 7mm LRM is basically a 375 Ruger case necked own and the shoulder knocked back a bit to make a longer neck. The 7mm-375 Ruger is just that, a necked down 375 Ruger. The 7mm-375 Ruger actually has a bit more capacity than the 7mm LRM, but also has a shorter neck.

Both 7mm variations of the 375 Ruger case can easily match the speed of the 7mm STW, BUT accomplish it in a more compact design that can utilize a standard magnum action and still allow seating of heavyweight VLD bullets in a magazine. Not to mention no belt and better brass. The 375 Ruger actually has identical case capacity of the 8mm Rem Mag case, but is way shorter. It is even shorter than the 300 Win Mag case.

375 Ruger case length: 2.580" Case capacity: 99gr H2O
8mm Rem Mag case length: 2.850" Case capacity: 99gr H2O

*Both utilize standard magnum .532" bolt face

I recently built a 338 version off the 375 Ruger case and it is a real shooter. Running Berger 250gr VLD's at 2925 fps in a Rem 700 Magnum action seated deep enough to fit in the magazine and shooting roughly 1/3 MOA 3 shot groups.
(only tested groups to 500 yards so far)

The 375 Ruger case is well designed for superb accuracy and massive knockdown power in any caliber format

 

[pmarauder]

Brandon, What do you mean by "better brass"? Who is making the 375 Ruger brass now? I thought it was Hornady

Derek

 

[Savage99]

Avoid Redding FL dies if you can. Their FL dies don't have an air bleed hole like RCBS and some other dies do.

Your more likely to get dents.

 

[BigDMT]

Brandon, What do you mean by "better brass"? Who is making the 375 Ruger brass now? I thought it was Hornady

Derek

Sorry. I meant better brass design. 375 Ruger has 30 degree shoulder and less body taper. 8mm has 25 degree shoulder and more taper.

However, Nosler is coming out with the 375 Ruger brass as well.
Hornady works fine for me though

 

[pmarauder]

Yeah, I am using the Nosler brass for my STW. Im not pushing it to hard with the 180 VLD's at 3150. It shoots pretty good at 1k. I agree, its not a very efficient case, but with the Larry Willis dies, The brass lasts a long time with a mild load.

In comparison, I can push my 7SAUM with the 180 Hybrids at 3100, but this is a hot load. This one shoots the best right at 3000. I shot a couple 5 shot groups at 1k that were ridiculous.

 

[BigDMT]

There is absolutely nothing wrong with the 7mm STW. It is an excellent round that has been proven in the field by wildcatters for nearly 30 years now. Very powerful and accurate round.

I was just clarifying the reasoning of the 7mm LRM design to member "nastynatefish" who did not understand the benefits it offered over the 7mm STW.

I always wanted to build a 7 SAUM. I actually went as far as buying the dies, brass and bullets at one time before abandoning the project to build my original 6.5 Rem Mag. Wish I would have seen it through. Still might build one some day...

The reason I even started reading this thread is because I recently picked up a 26" stainless 7mm barrel chambered for 7mm Rem Mag that I am planning on boring out to the 7mm-375 Ruger. Should be a fun long range round with a little less recoil than my 338 version yet similar, if not better, trajectory at long range.

 

[Raythemanroe]

A brass maker should come out with a round right between 7mm 375 Ruger and 7mm LRM, It would gain popularity just cause everyone would need the brass.

 

[wwbrown]

If I get my act together today I should be shooting my 30-375 Ruger tomorrow. The goal with this round was to get about the maximum capacity in a 30-06 length without increasing the rim diameter beyond the standard mag diameter of .513". It is a tactical build, no way do I want to shoot F-class with this bruiser, for me here are the specs:

- Bartlein MTU contour 1-10" currently finished at 23.5"
- Three port CeneterShot brake, precursor to the Muscle Brake
- Timney trigeer
- Joel Russo laminated A5 stock
- EGW 20 MOA Picatinny rail
- Scope TBD
- Throated for 220 grain bullets

I went with a shorter barrel than usual to make it a little faster on target acquisition even with the stout barrel. It started out because I had Howa 1500 magnum action sitting empty and ignored in the shop.

Others have built 30-375 Rugers so it is not a new round, but is new to me as I do not have much data on it.

 

[jonbearman]

How does a 7mmwsm run with the larger cartridge's just out of curiosity.I would think that it would shoot well in long range shooting.Always been curious as to why such a hammer if something else would do it with less punishment.I know a brake will calm it down but wouldnt the wsm brass be more consistent with the design currently available.The AMU does well with the old stand by 300 win mag.

 

[dkhunt14]

Jon one of the guys at Williamsport was running a 180 Berger at a little over 3200 with his 7WSM. He was running it really hot and I think he was using R19. The accuracy wasn't what was needed for 1000 yard benchrest. Seems the 7 SAUM was better for benchrest. Now for longerange hunting it would have been great.

 

[nastynatesfish]

I just like the looks of the stw. If you can run the 180 that fast on a lower charge or propellant in my eyes is a better deal. My eyes anyway. I don't really care for 100 grains of powder and bullets I can't find lol. I'm about out of 162 amax so now gonna be working on the 162 bthp. like I said my .02 I do really have a itch for a STW though

 

[Rtheurer]

How does a 7mmwsm run with the larger cartridge's just out of curiosity.I would think that it would shoot well in long range shooting.Always been curious as to why such a hammer if something else would do it with less punishment.I know a brake will calm it down but wouldnt the wsm brass be more consistent with the design currently available.The AMU does well with the old stand by 300 win mag.

The AMU uses the 300 Win Mag??? When did that happen?

RussT

 

[TonyR]

How does a 7mmwsm run with the larger cartridge's just out of curiosity.I would think that it would shoot well in long range shooting.Always been curious as to why such a hammer if something else would do it with less punishment.I know a brake will calm it down but wouldnt the wsm brass be more consistent with the design currently available.The AMU does well with the old stand by 300 win mag.

The AMU uses the 300 Win Mag??? When did that happen?

RussT

+1, Russ. I thought they were shooting 7RSAUMs for LR.

 

[Rtheurer]

The Amu has been shooting the 7mm RSAUM for about 3 years now. Before that it was the 6.5X284 and that goes back to at least 2004. So almost a decade since they touched the 300 Win Mag.

It really does not matter what they shoot. Could most likley win with a sling shot.

RussT

 

[LCazador]

IMHO the problem with the short mags is a short neck to work with, and inferior quality brass. On top of that you have to step all over the brass to acheive the velocity of the larger capacity cases. In the process of building my new long range 7mm on the 404 Jefferies case. No belt, long neck, and great Norma brass!

 

[dkhunt14]

ug

IMHO the problem with the short mags is a short neck to work with, and inferior quality brass. On top of that you have to step all over the brass to acheive the velocity of the larger capacity cases. In the process of building my new long range 7mm on the 404 Jefferies case. No belt, long neck, and great Norma brass!
Quote I use Norma brass for my Short Mags. The WSM short mags were designed off the 404 Jefferies case. They have great accuracy and velocity. In benchrest at a 1000 when you go over 3000 accuracy starts to fail. The 7LRM is made from a 375 Ruger case. The accuracy and velocity they are getting is really good.

 

[dkhunt14]

I just like the looks of the stw. If you can run the 180 that fast on a lower charge or propellant in my eyes is a better deal. My eyes anyway. I don't really care for 100 grains of powder and bullets I can't find lol. I'm about out of 162 amax so now gonna be working on the 162 bthp. like I said my .02 I do really have a itch for a STW though
[/quote I didn't see anywhere where it said a 100 grains of powder. The case I believe is same size capacity but is shorter in length overall. I believe I read on another forum where they were shooting it faster than a 7STW.