turrning a 300 Rum into 30-378 wby whats needed

[257wbymagkiller]

So im thinking about taking  my Rem 700 PSS in 300 RUM and turnning it into a 30-378 wby, what all is needed to do so it will be my first bolt gun build.

I know barrel, and bolt but is that all thats needed?

Go easy on me here guys

Or maybe even a 7mm wby or 270 wby id consider turnning it into

[CAMPMEAT]

.........and 30-378 ammo is around $150 a box. No thanks. I've wanted one myself, but just can't bring my self to spending that much for a box of 20.

[bhawley76]

Why would you want to the numbers between a 300 rum and the 30 378 are not that far off, and like Campmeat said the ammo is way more expensive. besides you already have a great gun.    

[bobcat]

Why are you wanting to change barrels and cartridge? Is it not accurate enough? If that's the case, have a gunsmith do some minor work on the existing rifle.

[elkslayer069]

I don't know the length of both cases or the diameter of either off the top of my head but if the rum is smaller in both accounts and the barrel has the correct twist rate all you would need is a reamer. It would be like turning a 7mm rem mag into a 7mm stw


Might post this is the gun section 

[257wbymagkiller]

The gun is very accurate. I have 2 300 RUMs now and would like to and to the weatherby  line I have going.

I know 30-378 iso not cheap at all but sure is fun.

7mm wby and 270 wby have always been on my hit list so I figured why not build on out of the 700 PSS and keep the 700 long range that's brand new. 

So would you guys do the 7mm wby or the 270 wby??

Probably should should be in the gun section. Good call.

[Dan-o]

Re-barrel it to a 30-30, and keep your shots ethically within 50 yards.

Oh, sorry, wrong thread.

I just thought that as long as everyone was telling you that you don't want what you said you want that I'd chime in.

Happy New Year.     

[haugenna]

I have reloaded for both. The 300 rum was more efficient. If you want to have fun, turn the 300 rum into a 338 edge.


Load data 30378 wby. 110 grains of retumbo 3350 fps
Load data 300 Rum. 100.2 grains of retumbo 3460 fps

[BULLBLASTER]

If I were in your place I think I would sell one rum and buy a weatherby mark 5 used. Cabelas in Lacey has a couple in 30-378. The accumarks I have been around have all been great shooters!

[BULLBLASTER]

I have reloaded for both. The 300 rum was more efficient. If you want to have fun, turn the 300 rum into a 338 edge.


Load data 30378 wby. 110 grains of retumbo 3350 fps
Load data 300 Rum. 100.2 grains of retumbo 3460 fps

What bullet weights are these numbers with?

[haugenna]

180 grain accubond and ballistic tips. Both had the same poi and the bt's grouped better at longer ranges.

the wby may outshine the rum with heavier bullets but not the case with the 180's

[BULLBLASTER]

180 grain accubond and ballistic tips. Both had the same poi and the bt's grouped better at longer ranges.

These are accuracy load numbers with your rifles?
I like posts like this, real life experience trumps published load data any day of the week.
I helped with load development on a 338-378 and 300 bergers. Could punch them real fast but accuracy wasn't there. Ended on a 2800 ish fps load for accuracy in that case.

[haugenna]

Yes. Both loads were very accurate. I could shoot sub Moa 3 shot groups consistently with both loads.

[257wbymagkiller]

If I were in your place I think I would sell one rum and buy a weatherby mark 5 used. Cabelas in Lacey has a couple in 30-378. The accumarks I have been around have all been great shooters!

We'll darn if camel's has a couple I might have to go check it out.

I have reloaded for both. The 300 rum was more efficient. If you want to have fun, turn the 300 rum into a 338 edge.


Load data 30378 wby. 110 grains of retumbo 3350 fps
Load data 300 Rum. 100.2 grains of retumbo 3460 fps

Have you had much experience  with 338 edge and if so how did you like it?

[haugenna]

I have not but it is something I would like to try.