Is it possible to rebore a 300 rum to 375 ultra mag or does it need to be rebarreled? would the stock channel work or would it need restocking? I am thinking of a sako 300 rum, model 75 with synthetic stock to be converted to 375 ultra mag.

Thanks,

Arjun

Yes but I am always against reboring. I know, some like it, but a new barrel is best, for me. Some bad stories from reboring.
Have you thought about your muzzle OD and how light a barrel you will have?
If you rebore it, it will still fit the stock.

Barrels are relatively inexpensive . I would suggest a new barrel . You may get too thin , it would depend on your contour .

Would there be any other work that needs to be done. I am told a 375 ultra mag is a 300 rum necked up! So feeding etc should be fine!

Don't bet the farm on "no feeding issues" Had a Satterlee action he'd set up for 416 Rigby...fed so slick you kind of wanted to look to make sure it DID feed.

Client changed mind to 450 Rigby. Most of a day spent making it feed/function. I've seen the same with 300 to 375 H&H.

There a small change in geometry that can really muck it up

I thought the only reason they made 300 Ultra mags was to turn them into .404 J.?

That is all the use I have for them. WITH a new barrel of course.

Most every New Haven 300 RUM will likely need to have the action blueprinted before the new barrel is fitted to it. That's to make sure the action threads are straight, the receiver face is perpendicular, the safety is timed, the scope base mounting holes are 8-40, and in a straight line, and the trigger is cleaned up and honed.

My 300 RUM will go in for its facelift soon. The barrel is already sitting on a shelf.

This is not a good hobby to spend your time trying to "game" the system, or to see how little money you can spend. Do it right, and you will have a rock solid, and straight shooting rifle.

If your rifle is working well for you now, you might want to consider leaving it alone. If you want a .375 for Africa, buy a new rifle. The 300 RUM will handle anything in North America. JMO, FWIW, YMMV, etc.

quote:

Originally posted by Duane Wiebe (CG&R):
Don't bet the farm on "no feeding issues" Had a Satterlee action he'd set up for 416 Rigby...fed so slick you kind of wanted to look to make sure it DID feed.

Client changed mind to 450 Rigby. Most of a day spent making it feed/function. I've seen the same with 300 to 375 H&H.

There a small change in geometry that can really muck it up

Old VanOwen used to look at those conversions and in his broken Dutch way would say: "Some guy is vanting to put a Clydesdale into a Dunkey und der is going'k to be a twouble!"

I'm sure that Paul Mauser never envisioned someone using cartridges that large in his design.

I'm thinking of turning my 300RUM into a 500MDM, but a push feed DGR doesn't make sense to me.

Every weapon the Army uses is push feed and all of them are for dangerous game. I always questioned the real advantages of CRF, and yes, I well know the difference. Feed reliability is about 1000 times more important.

quote:

Originally posted by theback40:
I thought the only reason they made 300 Ultra mags was to turn them into .404 J.?

We developed and built several wildcats on the 404 case long before Remington came up with their RUM cartridges.

I have a 30/404 built on a Sako action with a 28 inch barrel.

It is extremely accurate, with practically any bullet!!

I have used it on a hunt in South Africa, shooting animals out to 500 yards.

My PH kept saying "I want one of those"!

Once we saw a wildebeest quite far away, and we asked Walter to shoot it with his Blaser 7x64.

He refused, saying "it is too far. Why don't you shoot it then?"

I did.

One shot with a 180 grain Sierra Match King and that was the end of it.

By the way, we were testing bullets at that time, that is why I used the Sierra MK.

quote:

One shot with a 180 grain Sierra Match King and that was the end of it.

Are you sure it was dead every one knows a Sierra match bullet well not kill any thing.

It is a well known fact that it is unethical to use them also.

I am glad that shot had a happy ending and you were very lucky using one of those match bullets on game.

There is some where a 100 plus page thread here discussing the whole sorted matter of using MATCH bullets on game.

I don't know how you can live with your self.

quote:

Originally posted by p dog shooter:

quote:

One shot with a 180 grain Sierra Match King and that was the end of it.

Are you sure it was dead every one knows a Sierra match bullet well not kill any thing.

It is a well known fact that it is unethical to use them also.

I am glad that shot had a happy ending and you were very lucky using one of those match bullets on game.

There is some where a 100 plus page thread here discussing the whole sorted matter of using MATCH bullets on game.

I don't know how you can live with your self.

I actually shot a whole bunch of animals with the Sierra Match Kings!

Every single one of them died with one shot

We were not able to recover any of them as they fell apart.

But they did their job.

I short a zebra about 70 yards way, hitting him on the shoulder. The bullets created an enormous crater almost a foot wide, but did not penetrate into the chest!

He dropped stone dead in his tracks!!

quote:

Every single one of them died with one shot

My experience also.

quote:

Originally posted by dpcd:
Every weapon the Army uses is push feed and all of them are for dangerous game. I always questioned the real advantages of CRF, and yes, I well know the difference. Feed reliability is about 1000 times more important.

Actually it was the military thinking of old that got everyone started with the controlled round feed feature in the first place. Back in the day, soldiers under fire were reported to get excited and pull the bolts back on their rifles and then push them forward without closing them and then try to cycle them again. This resulted in a condition with one round in the chamber and one trying to get in which left the rifle hopelessly jammed. The controlled round feed was adopted so this condition could not occur. If the operator short stroked the action and attempted a double feed, the first cartridge would simply be expended, unfired, onto the ground and the duck shoot could continue. Soldiers coming home from the wars applied this technology to dangerous game hunting. The logic was the same. Today's military doesn't give a rats ass about controlled round feed simply because everything on the battlefield today is semi or fully automatic operation. Only a few units or forces still use bolt action rifles and these groups are so highly trained that controlled round feed is simply not needed.

The hunting theater of today is still predominately weaponized by the bolt action rifle. Especially those persons engaged in hunting dangerous game. So, the thinking of old is still carried on and probably still applies. I personally don't choose to hunt with people who get overly excited when hunting or shooting. It serves the same purpose.

You are describing a failure in user training; not with advantages or disadvantages of either type of feeding.
Yes, CRF was developed to allow mass conscript armies to use bolt actions with minimal stoppages, after less than optimal training. You will do in combat as you are trained to do.
So, the real issue, is the user/hunter. Not the tool he uses. If hunters were trained in how to operate a bolt action rifle, they would never know the difference in feeding types.
Of course, that will never happen, so many hunters want the CRF to compensate for their lack of training.
I am not talking about anyone here on AR, so don't send me any hate mail.

quote:

Originally posted by dpcd:

Of course, that will never happen, so many hunters want the CRF to compensate for their lack of training.
I am not talking about anyone here on AR, so don't send me any hate mail.

Except of course for that ONE GUY! Now THAT GUY is a whole different matter.

BBBWWWWAAAHAHAHA HA HA Ha Ha ha ha he he

the 375 is shorter, and you might have some "beating the bullet back into the case" issues

quote:

Originally posted by jeffeosso:
the 375 is shorter, and you might have some "beating the bullet back into the case" issues

I think you are thinking of the 338 RUM, the 375 is the same length as the 300.