Anyone make the 30/375 ruger yet?

I am thinking the case length and neck of the 300 win mag with the body of the 375 ruger. Or simply necking the 375 ruger to 30 cal. Seems that necking the 375 case to 30 cal will lengthen the neck more than long enough to gain .004".

I've been thinking about one for awhile and will probably do it this winter.

4D rents a reamer



I have talked to Hornady about their dies. Eventually I got a FL 338RCM die and a 300RCM neck die. I have a 375 Ruger so the process would be:

• Size 375 Ruger case with the FL 375 Ruger die without the expander
• Size the neck only with the FL 338RCM die
• Size the neck only with the 300RCM neck die
• If needed size the case body and push the shoulder back with the FL 375 Ruger die

This is what it looks like afterwards



300 win mag, 30/375 Ruger, 375 Ruger



The case lengthened about .008" but the neck brass did not thicken measureably.

My plan is to rechamber an existing 300 win mag. The barrel may have to be set back a thread or two but other than that it should be a simple process.

That looks sweet. I currently have a 300 win mag I would love to do this to.

Any idea what the case capacity difference is between the 300 win mag and the 30/375 Ruger?

You're not the only ones looking at it!

I was disappointed when they introduced the RCMs.....I'd have thought necking the .375 Ruger down was the next logical direction.....I sure was surprised with the "compacts".....

It seems that .300 Weatherby potential lurks in the .300-.375 Ruger and that .340 Weatherby potential is available in the .338-.375 Ruger.....and at a minimum loss of the belt!

Even a .358-375 Ruger is interesting and would give a marvelous send off with a 250 grain Nosler partition.....

I'll just cheer you guys on as I'm still fondling ideas with the .376 Styer case....

quote:

Originally posted by RMiller:
That looks sweet. I currently have a 300 win mag I would love to do this to.

Any idea what the case capacity difference is between the 300 win mag and the 30/375 Ruger?

The 300 win mag is around 87 grains so the difference will be between 6 to 8 grains, depending upon chamber and case sizes.

My main purpose is to shoot the 200 gr Accubond at an honest 3000 fps without a muzzle brake.

Oh, and just for fun!

I got 2900+ with a 300 win mag and 200 Barnes TSX bullets. Seems this should get 3000 easy enough with a 200 grain bullet.

I've been talking with Westpac who posts here on the forum about doing it, perhaps if you wanted to share the cost of the reamer he could do 2 at one time.

Just need to get a

If you please...What is the measured case capacity of the 30-375 Ruger? Not too far off the 300 Win mag but cool.

quote:

Originally posted by RMiller:
I got 2900+ with a 300 win mag and 200 Barnes TSX bullets. Seems this should get 3000 easy enough with a 200 grain bullet.

I just did the math at the "4 to 1 ratio" and it adds about 60 FPS....

Is it worth it?.....you be the judge.

Personally, I'd move up in caliber for that.

quote:

If you please...What is the measured case capacity of the 30-375 Ruger? Not too far off the 300 Win mag but cool.

The reamer drawing says 93.64

Not sure what the 4 to 1 ratio is but I also got 3200 Fps with 200 grain bullets from 5 different mod 70 300 RUMs and the rum holds 110 grains of water.

quote:

Not sure what the 4 to 1 ratio is

It's a pretty good rule of thumb to estimate wildcats.....You can assume that for every 4% increase in capacity, you can achieve 1% increase in velocity.

A lot of folks think this is a reasonably fair estimate.

Thanks for the info. It does come pretty close with my 300 win mags and the 300 ultras I have had. According to my crude math I come up with 2.88 to 1 with the 300 win having a 2930 FPS velocity and the rum having a 3200 fps velocity. A 26% increase in capacity gave a 9% increase in velocity.
So using 2.88 as an optimistic though realistic ratio that would give a 76 fps increase. .

Very interesting, basically a beltless .300 Win Mag with a little more case capacity. I'm very fond of the .300 Win Mag.

it would be a 300 weatherby, in case capacity, 300 win in length


as for forming... get 375 ruger basic

Hey jefe

So you're saying get basic brass which has a straight case body size neck and size it with which die? Don't have a 30/375 Ruger die.

Seems to me the neck starting out bigger than .375 would be harder to size the neck down.

How would that work?

Iwas thinking*** if any caliber has been over done by sudo wildcaters it's the 30 cal. Once in a while we got to get real*** maybe***. Any increase in performance over the 30/40 is distance related only! roger

This is what they should have brought out instead of the RCM line. I've been kicking this idea around for a while now.

R Miller
captain
woods

threefer on the reamer rental?

Either of you have a 300 win mag to rechamber or gonna get a new barrel?

quote:

threefer on the reamer rental?

That might be difficult.....when I've rented reamers I was given something like a week to get it done and on the way back.

Mailing it to others might be too slow.

quote:

That might be difficult.....when I've rented reamers I was given something like a week to get it done and on the way back.

Mailing it to others might be too slow.

About the only way it would work is someone having all 2 or 3 barrels at the same location ready to go at the same time.

quote:

About the only way it would work is someone having all 2 or 3 barrels at the same location ready to go at the same time.

The way I do it also requires the receiver and the bolt. This almost requires an FFL as the paperwork eats up the advantage. Then add $40 shipping each.....it's not panning out.

But here's a thought.....at least for Mausers and pushfeeds one could "long chamber" other's barrels about .020 and then let them finish the work.....

In that case no FFL is required and the only shipping is the barrel.....and that's not a high priced thing to ship.....$5.00 usually gets it done!

I was thinking we would all have our actions/barrels with Westpac at the same time. It only costs $25.00 to ship a rifle insured for $1,000. No FFL required as long as you furnish the smith the action. If buying a barrel have that shipped direct to him and you ship your action.

quote:

Originally posted by woods:
I was thinking we would all have our actions/barrels with Westpac at the same time. It only costs $25.00 to ship a rifle insured for $1,000. No FFL required as long as you furnish the smith the action. If buying a barrel have that shipped direct to him and you ship your action.

Don't forget the shipping both ways.....and Westpak does have an FFL so that's not an issue.....

Now....the best way of all:

One guy buys a new reamer for about $125 and uses it once and then loans it free to two others.....and at the end sells it on the classifieds.....I'm guessing $50...

Three guys split the cost of $75 by paying the buyer $25 each.....far and away the cheapest!

quote:

Originally posted by jeffeosso:

as for forming... get 375 ruger basic

Whence?

I can't jump on board yet. I don't have a donor around or anything of the proper size to build on. However, I will be watching the thread and if I do get things together, maybe I will be ready when you guys are. I do think this is a worthwhile cartridge. It removes the belt from the 300 Win, and that's all I need it to do personally! Any performance gains are icing on the cake for me.

After all is said and done you end up with a short 300 with no belt? A new Weatherby Vanguard Synthetic Bolt Action Rifle in 300 Wetherby will cost $467.

.040" shorter than the 300 win mag with 6 or 7 gr more powder. .245" shorter than the 300 Wtby with 5 or 6 less gr powder.

Much cheaper brass than the 300 Wtby and unbelted. Will fit in a regular Long Action rather than a Magnum Action.

Pros and cons but this is the Wildcat Forun isn't it?

I've never loaded a wildcat and have no experience with them whatsoever so someone please explain.... Why make the neck so short? Right or wrong, hasn't a short neck been one of the few criticisms of the 300 win mag?

Well you are trying to fit the most into a regular long action. Typically that is a cartridge that will fit in a 3.4" magazine and out the ejection port.

It certainly makes it a lot easier to be able to rent or purchase a reamer. There are a lot of commercially available reamers that are considered wildcats. Take a look at this page from 4D Products.

It also makes it much easier to be able to size with existing dies of whatever caliber. For instance my project which will utilize 375 Ruger FL die, 338RCM FL die and 300RCM Neck Sizer. Haven't thought about a seater yet or have forgotten what I decided but I'm sure something will work.

If you have to start from total scratch then you would have to design and have built a reamer and dies. I guess you could call this a Semi-Custom Wildcat.

So this is the semi-perfect 30 cal?

Which then begs the question: What is the perfect 300 magnum case design disregarding any peripheral considerations (cost, lost ammo in remote places, hassle of obtaining components, etc.?)

Here's a thought,

Provided you set the depth correctly....

can you neck size the brass with full length WSM Dies if you have them. After all your not sizing the body just the necks, and the wsm cases are slightly wider.

Shoulders angles are different but WSM is wider?

I actually would like to build one in 270 on the Ruger case. I have a friend with a 35 wsm, I have 325, 300 and 270 surely I could use wsm FL dies.

Has a 270 version been done?

Woods,

The other thing I don't understand is the 300RCM has a .305" neck going by the drawing at 4D. Why would the 30-375 using 300RCM dies have a shorter neck?

Clint

4D 300RCM

Well I'm just telling you what I have learned from conversations with Hornady (one of their techs actually has a 30/375 Ruger and uses it for 1000 yd competition I was told) and from actually sizing the case neck down. One thing is that you can only size down so many thousands at a time so going from a 375 ID to anything smaller than 338 ID has to be done in stages. That is why I got the 338RCM FL die and a 300RCM neck sizer.

A 338RCM neck sizing die would not have worked because the neck sizer does not have a gradual lead in to the neck and it would have crunched the case (according to Hornady, they tried it).

If you are going down to a 270, lots of luck. You will put a lot of working on the brass neck, not saying it can't be done. I have only worked through the scenario I posted about and it was a discovery process. Let us know if you work yours out. A 270/375 Ruger would be interesting but definitely be way overbore.

Clint, I'm thinking about your question. Don't know but not sure what bearing it has. The Neck Sizer can be adjusted to size as much of the neck as I want since the bottom of the die does not hit the shell holder since the RCM is much shorter than the 30/375 Ruger case. Might have to do some trimming.

How about it, anyone else about to try this out? I will be sending my rifle before too long. Especially when my Iraqui Dinars pay off after Re-Valuation!

A 30/375 Ruger sounds like the ideal 300 mag to me. That's why I asked you so many questions about the neck i.e. avoid even the appearance of having an imperfection. I want one pretty badly and will probably start on a custom when my 375 HH is finished. I'm glad you're working all the kinks out!

Clint

Z-Hat has a reamer and has been chambering rifles in 30-375 Ruger. Maybe if one was to contact them they may have some useful information.

Don't mean to douse the idea with a bucket of cold water, but it seems that most of the higher velocity .300s get their best accuracy down at .300 WM velocities anyway. Mine get's 3,160 with a 180 gr. Hornady, and does 3/8" to 1/2" @ 100.
The .30-378s, and ultram mags I've shot for the shop don't seem to group worth a damn until down to about 3,100 anyway.
Good chance that the one's I've shot were lemons, but have yet to see an accurate over bore .300 that shoots at top velocities.

DW,

I had a bit of an opposite experience with my 300 Wby. When I was developing loads for it, the faster it went the tighter the groups got. I'm not sure this is as much a "velocity" thing as it is the % of the case being filled. Starting loads were nearly 2" and when I stopped working they were down to 3/4". I still had room to go, but ran out of time and didn't really go any farther on that experiment.

This nice thing with wild cat would be getting at or above 300 Win velocity without pushing the pressure limits at all. That is never a bad thing with wild cats since the brass can last longer! Less fire forming or expensive custom case orders.