The Accurate Reloading Forums
RSM 375 H&H to 378 Weatherby
17 July 2009, 05:50
Brad aka Pill ShooterRSM 375 H&H to 378 Weatherby
Has anyone done this conversion on a magnum mauser action? I'm thinking about converting a Ruger Safari Magnum.
Thanks Brad

17 July 2009, 05:53
Big Bore Boar HunterI think you will need the 416 Rigby action, I believe the 378 wby is bigger than the 375 H&H by quite a bit.
John
17 July 2009, 05:57
MacifejSell the Ruger and buy a proper MKV in .378 - it's a muuuuuuch better gun.
17 July 2009, 06:07
Big Bore Boar Hunterquote:
Originally posted by Macifej:
Sell the Ruger and buy a proper MKV in .378 - it's a muuuuuuch better gun.
Having a MkV and an RSM, I can say the RSM isn't all that bad. The mkV has the nod on feeding smoothly though. The RSM is so solid, if you run out of ammo, you could knock a critter out with it.
John
17 July 2009, 06:16
.366torquequote:
Originally posted by Brad aka Pill Shooter:
Has anyone done this conversion on a magnum mauser action? I'm thinking about converting a Ruger Safari Magnum.
Thanks Brad
Another good option, buy a CZ 375 and rechamber, etc.
Get
AHR to do it and get
their 3 position safety and trigger.
You'll then have a Safari ready rifle.
17 July 2009, 06:20
Macifejquote:
Originally posted by Big Bore Boar Hunter:
quote:
Originally posted by Macifej:
Sell the Ruger and buy a proper MKV in .378 - it's a muuuuuuch better gun.
Having a MkV and an RSM, I can say the RSM isn't all that bad. The mkV has the nod on feeding smoothly though. The RSM is so solid, if you run out of ammo, you could knock a critter out with it.
John
Agree - no problem with the Ruger Magnum but in .378 the Weatherby is far superior. Spend $1,500 more than the Ruger and get a slicked and trued Custom Shop .378 with the drop box.
17 July 2009, 06:23
Big Bore Boar Hunterquote:
Originally posted by Macifej:
quote:
Originally posted by Big Bore Boar Hunter:
quote:
Originally posted by Macifej:
Sell the Ruger and buy a proper MKV in .378 - it's a muuuuuuch better gun.
Having a MkV and an RSM, I can say the RSM isn't all that bad. The mkV has the nod on feeding smoothly though. The RSM is so solid, if you run out of ammo, you could knock a critter out with it.
John
Agree - no problem with the Ruger Magnum but in .378 the Weatherby is far superior. Spend $1,500 more than the Ruger and get a slicked and trued Custom Shop .378 with the drop box.
Agreed, but if I were to deal with the blast and recoil, I think I would pick the 416 Wby. But then again, I've already been recoiled silly.
John
17 July 2009, 06:43
Brad aka Pill ShooterHere the reason for the question my new 500 Jeffrey needs a mate.
Thanks Brad

17 July 2009, 06:55
MacifejGotta go with a .404 to match the .500 ... no other possibility there ...!!

17 July 2009, 07:24
Big Bore Boar Hunterquote:
Originally posted by Macifej:
Gotta go with a .404 to match the .500 ... no other possibility there ...!!
Macifej, we think too much alike, its scary. I'll go +1 on the 404, I wish more factory rifles chambered it. It is surprisingly effective for its level of recoil. It is the 7x57 of the big bore world.
John
17 July 2009, 09:26
Brad aka Pill ShooterI think I tried the 404 idea but there is too much metal gone in the 375 H&H chamber to go with the factory barrel and a 404. Also I want a little more recoil Please
Thanks Brad

17 July 2009, 09:30
Big Bore Boar Hunterquote:
Originally posted by Brad aka Pill Shooter:
I think I tried the 404 idea but there is too much metal gone in the 375 H&H chamber to go with the factory barrel and a 404. Also I want a little more recoil Please
Thanks Brad
I do think you would need to rebarrel. More recoil? You already have the 500J, quit screwing around and go 600OK!
John
17 July 2009, 16:19
jeffeossoIt's easy... bolt face (50 buckes), get the rigby mag box, follower, spring (30 bucks), rechamber and feeding (250 MAX)
John, "rebarrel" a rsm? it is a intregal (dual) quarterrib barrel .. that's 2000 bucks and a year's wait
forget the 404 idea.. one would have to setback the barrel
Brad, it will work, and if people can make an enfield run a rigby, this one is easy
quote:
Originally posted by jeffeosso:
It's easy... bolt face (50 buckes), get the rigby mag box, follower, spring (30 bucks), rechamber and feeding (250 MAX)
John, "rebarrel" a rsm? it is a intregal (dual) quarterrib barrel .. that's 2000 bucks and a year's wait
forget the 404 idea.. one would have to setback the barrel
Brad, it will work, and if people can make an enfield run a rigby, this one is easy
Jeff is right just call ruger get the parts, with a good gunsmith, pretty straight foward.
Ed
DRSS Member
17 July 2009, 19:47
RobgunbuilderDont forget you'll need a Rigby extractor and Feed ramp work (a lot of it) will also be necessary. If this costs $250 then you live in the land of Cheap gunsmiths. -Rob
Never underestimate the power of stupid people in large numbers to do incredibly stupid things- AH (1941)- Harry Reid (aka Smeagle) 2012
Nothing Up my sleeves but never without a plan and never ever without a surprise!
17 July 2009, 19:55
Macifejquote:
Originally posted by Robgunbuilder:
Dont forget you'll need a Rigby extractor and Feed ramp work (a lot of it) will also be necessary. If this costs $250 then you live in the land of Cheap gunsmiths. -Rob
Jeffe forgot some Zeros in there somewhere ...
17 July 2009, 20:00
jeffeossozeros? NO WAY .. if it's double that, you are being ROBBED
more than $250 for a rechamber and feeding is not cool.. double that much is INSANE, unless there's a "real" name accosicated with the work
D'arcy does feeding for $100 bucks, if you can gethim to take the work. You guys are seriously overpaying..
NO WAIT ... its the kalifornicated gunsmiths that HAVE to overcharge.
17 July 2009, 20:07
tiggertatequote:
Originally posted by jeffeosso:
zeros? NO WAY .. if it's double that, you are being ROBBED
Was that pun intended?

"Experience" is the only class you take where the exam comes before the lesson.
17 July 2009, 20:10
jeffeossoyes.. LOL.. but not kickin rob
17 July 2009, 20:12
MacifejAin't no Gunsmiths in Kaliforniastan Jeffe ...

If there were they wouldn't be workin' for $10 an hour like the boys in Texas.
17 July 2009, 20:24
RobgunbuilderYou could not get a gunsmith here in NV or Ca to rechamber a .375 H&H to a .378 wby for less than $200. The Rigby box will need its ribs filed to fit the .378Wby, Feed ramp reground, extractor hook reshaped, rails opened, bolt face opened and re heat treated. follower smoothed. etc. If you get all that done and it feeds properly and shoots accurately and it costs you less than $500, I'd say thats a hell of a deal. At least out here it is. Frankly, I'd charge at least that if I did gunsmithing for others which I dont. Most decent smiths want $75/hr you know, about as much as my gardener.-Rob
Never underestimate the power of stupid people in large numbers to do incredibly stupid things- AH (1941)- Harry Reid (aka Smeagle) 2012
Nothing Up my sleeves but never without a plan and never ever without a surprise!
17 July 2009, 20:29
jeffeossoquote:
Originally posted by Macifej:
Ain't no Gunsmiths in Kaliforniastan Jeffe ...

If there were they wouldn't be workin' for $10 an hour like the boys in Texas.
50 bucks for opening a bolt face, swapping mag, follower, spring, and recahmbering taking 30 hours?
That's what you are saying, Jay .. 300 bucks for the work, which is VOER 100 bucks an hour for the work
If it takes more then 2 hours to open the boltface, remove the barrel, rechamber, and put together, then OF COURSE it will cost more.
here's a clue, guys .. liekteh CZ, the ruigby and HH cases use teh same rails .. just needs some feed work.
Dang, boys, that's robbery
17 July 2009, 20:44
Macifejquote:
$75/hr you know, about as much as my gardener.-Rob
You have enough grass and bushes to keep me busy 40 hrs a week ...??

17 July 2009, 21:19
gumboot458.. The biggest problem I see is the barrel length ..mI thot the Ruger had a 23" barrel ... . Pretty short for trying to burn 110 grains of powder ....
.If it can,t be grown , its gotta be mined ....
17 July 2009, 21:23
Brad aka Pill ShooterYou mean this kind of work?
I was hoping to put together something a little more than my 375 H&H's. I just thought a 500 Jeffrey with a fast 375 would make a nice combo. The RSM's are so big and heavy that they tend to shoot pretty mild. I do have some who did the work on the 500 Jeffrey and would commission another RSM custom once I pay off my current bill. Not sure about the 23" barrel. I'll have to run Quick Load and check it out.
Thanks for all the input.
Brad

17 July 2009, 21:27
RobgunbuilderMacifej- I live in the F===ing DESERT! What is grass? Bushes, you must mean Cactus right? Yup I got a whole Desert for you. Its 99 degress right now so how soon you wanna start cause its gonna get to 112 today?
Jeffe- If he starts with a .375 H&H RSM its gonna take way more rail work. Heck just set-up time to do a boltface is 1 hr, then since its case hardened you have to re case it. Rechamber set up to finish at least 1.5 hrs unless he uses a drill press! In any event, lets see what cost quotes he gets on this project. No use any of us guessing.-Rob
Never underestimate the power of stupid people in large numbers to do incredibly stupid things- AH (1941)- Harry Reid (aka Smeagle) 2012
Nothing Up my sleeves but never without a plan and never ever without a surprise!
19 July 2009, 08:07
Macifejquote:
Macifej- I live in the F===ing DESERT! What is grass? Bushes, you must mean Cactus right? Yup I got a whole Desert for you. Its 99 degress right now so how soon you wanna start cause its gonna get to 112 today?
So what exactly does your gardener do there ... ??

19 July 2009, 08:39
Big Bore Boar Hunterquote:
Originally posted by Macifej:
quote:
Macifej- I live in the F===ing DESERT! What is grass? Bushes, you must mean Cactus right? Yup I got a whole Desert for you. Its 99 degress right now so how soon you wanna start cause its gonna get to 112 today?
So what exactly does your gardener do there ... ??
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