Quick question. I have a remington 700 long action that was previously on an 8mm rem mag and I want to put a 300 RUM barrel that was off of another remington 700 onto the old 8mm action. (The barrel is a 26" factory remington 700 barrel in 300 RUM) Besides having to headspace the action for the new cartridge, do you believe that I will have to have the chamber reamed to fit the 300 RUM bullets, or do you believe that I should be able to screw in the new barrel considering that they are both from remington 700 "magnum" rifles.
I believe that my father-in-law and I can do the headspacing, as he has done it before, but he doesn't have the reamers so we would have to take it to a gunsmith if any other work is required.
Just wondering if anybody has any experience doing this.
The feed rails will probably have to be modified to get the best feeding and the multramag magazine insert will be required in order to have a magazine capacity of three cartridges.
I would also recrown. If you are going to do all that, might want to consider a really quality barrel. I know I would if I was going to do all that work. I have a krieger myself on my 300RUM and love it. Modifications should be very minimal. But remember a 300RUM has alot of freebore (like .2"), but not near like a weatherby. If I had to redue my 300RUM, I would find a smith to put me a custom throat on the gun without all the freebore.
The feed rails will probably have to be modified to get the best feeding and the multramag magazine insert will be required in order to have a magazine capacity of three cartridges.
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ORIGINAL: bigcountry
I would also recrown. If you are going to do all that, might want to consider a really quality barrel. I know I would if I was going to do all that work. I have a krieger myself on my 300RUM and love it. Modifications should be very minimal. But remember a 300RUM has alot of freebore (like .2"), but not near like a weatherby. If I had to redue my 300RUM, I would find a smith to put me a custom throat on the gun without all the freebore.
wow! sounds like alot of work??? I mean wouldnt it be cheaper to just go get a used 300 rum? Saw one at Cabelas 2 weeks ago for $599! Just curious.
Sure it would be be alot of work, but after having some quality barrels, on some of my rifles, its hard for me to go back to factory barrels. They are smooth as silk. And as long as you get a good gunsmith to do your throat and crown for you and set your headspace, you are almost guaranteed a shooter.
Getting into custom built guns should never be a investment. You will never get your money out of them you put in. It all depends on what you want. I mean all you need is 2MOA accuracy or even less for deer/elk but most of us (including you) demands more. And we are not as lucky as you getting a sub .5MOA shooter.
mossy33oak, your probably right that it is easier to just go out and buy a 300 RUM, but this is more of a do it cause it's fun project as opposed to it being my only rifle. Like I said, I have some spare parts laying around, including a browns precision stock that this "new" rifle is going to sit on, and a VXIII scope, and the barrel is only costing me $30 bucks. So depending on what and if any smith work is needed, I may be able to get away with a "new" 300 for around $100 bucks.
Anyways, thanks for the info all. A couple more questions. stubblejumper, you said that a ultramag magazine insert will be needed, but do you think that the original 8mm mag magazine will not hold the 300 RUM bullets?
bigcountry, you stated that you would also recrown. Why? Like I said, with a quality stock, scope, receiver and trigger already in my possession, I am hoping to get away with this for as little as possible, so going out and spending 200 - 300 dollars on a barrel is kind of defeating the purpose.
I am not looking to build a match competition rifle, but I would like to get MOA groups out to 400 - 500 yards. Some may say that that is wishful thinking, but I already have a sendero in 7STW that will shoot that way, and as far as I know, other than a HS precision stock, the sendero is all built in house at remington so hopefully I can get the same sort of performance out of a factory remington barrel.
hey fellas, it just occurred to me, I think we have gotten quite a following here on huntingnet for the 300 rum, I mean, for a caliber that my gun dealer told me was "dead, and soon to be forgotten" when I ordered my gun, in fact I got the last Left handed Savage that the distributor ever had. I think we got at least 5 or 6 on here shooting them. hey maybe we should get hats and jackets made, and walk around in a gang or something!! Sorry guys just being stupid for a minute!!
Building a new 300 RUM
Sorry guys just being stupid for a minute!! 
