From a 300RUM case?



I hope you can read the dimensions. Length is same as the .30-06; shoulder is .004 inches short of where it is on the Springfield; taper is straight from 300RUM; 30° shoulder angle.

If anybody is interested, I drew this on two sheets of paper taped together, at 10X actual size. Even that big, getting the measurements I show was still difficult. The .528 and .448 are pretty close, as are the 2.016 and 1.816, because they are extensions of the first two.

Yes, I know it is over-dimensioned, but I did that so I could just look and see what dimensions I wanted without having to add or subtract.

2.0994 at top should be 2.094. I don't know how to edit the .jpeg to fix that.

Yes!! I have one very close in 8mm. 8mmx404x2 1/2" IMP.and it is Home brewed.

Did you make yours from a 300RUM case?

quote:

2.0994 at top should be 2.094. I don't know how to edit the .jpeg to fix that.

quote:

Originally posted by homebrewer:
Did you make yours from a 300RUM case?

It started out as a 8mmx.425 WR but the cases were to soft. Opened the bolt face and lapped the chamber and went to .404 cases and than to .375 Ultra mag cases. the Ultra mag. cases do not extract and eject as good as the .404 cases because of of the smaller dia. rimm.
the cartrige has developed an energy level of just over 3300 ft.lbs.
It also has a longer neck and a little less powder capacity better facilitating heavier and longer bullets. roger

300 RUM is the same length. Might be easier to use them...?

rich

Not too far from this made from a 375 Ruger case

The idea is to try to save my 300WSM barrel and ream out the 300WSM chamber with the longer wildcat shown above. It should just clear in the angled area of the shoulder. I have another drawing on my drafting table that shows an "overwrite" of maybe .010 to .020 in that area. The problem is the WSM case has a lower reference diameter of .555 inches while the 300RUM has a diameter there of .550 inches. I measured each case, and the WSM measures .550 at the lower datum while the 300RUM measures .545 down there. It has me wondering if I can rechamber the WSM to fit the wildcat, and if the void there is going to be too much to adequately support the case. I do not know what the SAAMI diameter is for the lower datum in the chamber of the WSM. How much smaller is the chamber diameter of the 300RUM at its lower datum? Anybody know where can I find SAAMI drawings of these two cartridges, to include the chamber dimensions??

best I can do

Home Brewer! The larger chamber ain't good but it might not be all bad.Take for example the 6.5x55 euro cases as compared to the american cases. Some differ as much as .010" and I for one have never had a problem even at max. loading.Question,why are you looking to go to the larger cartridge? roger

quote:

Originally posted by bartsche:

Home Brewer! The larger chamber ain't good but it might not be all bad. Take for example the 6.5x55 euro cases as compared to the American cases. Some differ as much as .010" and I for one have never had a problem even at max. loading. Question: Why are you looking to go to the larger cartridge?roger

The 300WSM doesn't feed worth a damn in the long-action gun I have. I have to load them single-shot, then flip the bolt closed right quick to have the extractor grab the rim. Sometimes I get no round up the spout; other times I get a shell jammed in sideways and still other times I get a round in, but the extractor hasn't grabbed the rim. Then I have to shake or punch out the round with a cleaning rod. This always gives the RSO heart failure. So I figgered if I could dream up a round of .30-06 length, I could load the magazine and shoot like everybody else. When I built the gun, I didn't know the WSM had a larger base datum diameter than the 300WinMag or 300RUM. I was of the mind that if I din't like the WSM, I could rechamber for one of the others. Then my gunsmith asked why I had a short cartridge chambered in a long action. He said to do what I might want in the future, I'd have to slice off three inches of my barrel at the breech. I do not want to do that, so I'm thinkering with this design. I have a set of Butch Lambert's forming dies, but they are too small to neck down the shoulder to the .525 I'd need for the first squeeze. The biggest one at .400 just crushes down the shoulder. I have found a place that will turn up the five I need, but they are $80 each. I have thought about contacting Newlon Precision and having them make five dies that would gently reshape the cases, but I'd need to have five reamers made first to make the dies. I do not want to remove my barrel, slice off that three inches and then leave my rifle at the gunsmith's for a year or three. I have a lot of thinkin' and plannin' to do before this thing gets off the ground, if it ever does. My primary question is: Is the .555 to large over the .550 to use the chamber as it is, and to just cut the wildcat chamber into what's already there? If it is, I'm screwed...

quote:

Originally posted by Idaho Sharpshooter:

300 RUM is the same length. Might be easier to use them...?

rich

The RUM is a throat-destroyer. My wildcat will use more powder than a 300WSM but less than the 300RUM. It will be some sort of a .30-06 Magnum, if you will. I have a name for it, but I'll keep that secret until I can copyright the name and make untold millions on the proceeds of ammo bought for the wildcat. You see, opening the boltface, feed rails and cutting the new chamber into any .30-06 will make it into this magnum. And I want the millions and millions in royalties.

300 Dakota?

quote:

Originally posted by boom stick:
300 Dakota?

Nope. Looked at that one already. Brass costs an arm and a leg. 300RUM brass is dirt cheap by comparison.

If you send me your phone # I think I can help you and so can Butch. roger

yes -- it can be.. and its basically a long WSM .. you might want to start with 375 rum to begin with, though ...

jeff says,

quote:

...you might want to start with 375 rum to begin.

Same as the 300, just a larger mouth. I have been in private consultation via my Yahoo! email account with someone who really knows this stuff. The problem is that the RUM brass will have to expand by over .010 to fill the WSM chamber. Actually the expansion is around .015-- a veritable mile under these circumstances. This ain't lookin' too good. Why didn't Winchester just go with .550 when they designed the WSM? Would have made this exercise much easier. Is there any way on all of God's green Earth I can get some WSM cylindrical brass? I doubt it, but just asking...

your source is inaccurate, but not incorrect (he might be comparing actual chamber to actual brass, though - see woods drawing for the chamber)

wsm and rum are both saami speced at CASE HEAD being.550, with normal brass being about .547, and a normal chamber being about .5525 ... that's about .005 POSSIBLE expansion ... the rim is .532

(verifying against saami drawings)
300wsm casehead .550
300 rum casehead .550
(as for knowing stuff... i've only done 4 wildcats based off these, 3 of them with headstamped brass commerically available .. i just MIGHT know a thing or two about these cases, chambers, and production)


but take a set of calipers to new 30-06 brass ... its no where CLOSE to .473.


Now, back to why a 375 RUM --
a 300 rum will have a FAT shoulder wrinkle in your proposed neck.. the base of a 300 rum shoulder is 2.3873 .. right in the middle of your neck, and the only way to remove it is to make it bigger then smaller

so, if you start with the 375 rum, necking it to nearly straight and back down, removing the wrinkle, will be easier, as you will loose less cases to forming.

why care? loosing cases is very frustrating, and necking a 300 to about .416 and then back.. or .458.. or .475 ... results in a large number of cases split if starting from .300 ... but starting from .375 results in a minimal loss.

just tryign to share my expereince and the WHY of it ...

you MIGHT can buy rum basic from qualcart ..

and remember, if you are comparing, to always compare the SAME type drawing ..

chamber to chamber
cart to cart
die to die ...

comparing a chamber print to a resizing die print compared different things, with different tolerrences ..

btw, i've already designed the 300 AR .. 2.55 long rum .. as a max capacity standard length .308 chunker ... zero improvement over a 300 winmag, in reality, for the $1200 bucks it would cost to build the first one.

quote:

Originally posted by jeffeosso:

your source is inaccurate, but not incorrect (he might be comparing actual chamber to actual brass, though - see woods drawing for the chamber)

wsm and rum are both saami speced at CASE HEAD being .550, with normal brass being about .547, and a normal chamber being about .5525 ... that's about .005 POSSIBLE expansion ... the rim is .532

(verifying against saami drawings)
300wsm casehead .550
300 rum casehead .550
(as for knowing stuff... i've only done 4 wildcats based off these, 3 of them with headstamped brass commerically available .. i just MIGHT know a thing or two about these cases, chambers, and production)


but take a set of calipers to new 30-06 brass ... its no where CLOSE to .473.


Now, back to why a 375 RUM --
a 300 rum will have a FAT shoulder wrinkle in your proposed neck.. the base of a 300 rum shoulder is 2.3873 .. right in the middle of your neck, and the only way to remove it is to make it bigger then smaller

so, if you start with the 375 rum, necking it to nearly straight and back down, removing the wrinkle, will be easier, as you will lose less cases to forming.

why care? losing cases is very frustrating, and necking a 300 to about .416 and then back.. or .458.. or .475 ... results in a large number of cases split if starting from .300 ... but starting from .375 results in a minimal loss.

just tryign to share my expereince and the WHY of it ...

I had not thought of that. Very interesting. Something new to consider. Thanks.

I'd like to get away from the belt, but I have seen a man file it off in the past. He converted some belted case of caliber unknown to me to ".43 Spanish" by chucking the cases into a little system he made for turning them in a power drill, then filed and sanded the belts off. I have to assume it worked. I never checked back. That was in 1999...

http://www.midwayusa.com/viewP...productNumber=538862

From Bartsche.....

What is that? Is that my wildcat? Say it ain't so...

quote:

Originally posted by homebrewer:
What is that? Is that my wildcat? Say it ain't so...

It is so! Made from a .375 UM
30 x.375UM x2.5" IMP.Now make a cartridge from the .375UM that will fit your existing chamber and fire it.You might be pleasantly surprised! Or not! roger

Thanks, VD. roger

quote:

Originally posted by bartsche:

quote:

Originally posted by homebrewer:
What is that? Is that my wildcat? Say it ain't so...

It is so! Made from a .375 UM
30 x.375UM x2.5" IMP.Now make a cartridge from the .375UM that will fit your existing chamber and fire it.You might be pleasantly surprised! Or not! roger

How long did it take to form that?

quote:

Originally posted by homebrewer:
[QUOTE]Originally posted by bartsche:
How long did it take to form that?

Probably about 45 min.Changing bushings,dies and trimmer took most of the time. You could probably make 50 in 2 or 2 1/2 hours.You will have to reduce the neck wall thickness by .005" which I did not do so that will be added time. Just lazy I guess. roger

quote:

Originally posted by bartsche:

quote:

Originally posted by homebrewer:
[QUOTE]Originally posted by bartsche:
How long did it take to form that?

Probably about 45 min. Changing bushings, dies and trimmer took most of the time. roger

How do I go about procuring the necessary dies, et cetera? Whom do I contact?

PM me your phone # and we'll discuss it. roger