45-70 to 460s&w ???

I was being sarcastic, sorry. It would be much more than your gun is worth. With enough money and time any skilled individual can modify any gun into what ever you want. It gets absurd pretty quick though.
 
Just as importantly...why would anyone want to? The 45/70 can be loaded down to .460 S&W levels, and can be loaded to nearly double the power....save alot of money and aggravation and just download your 45/70!
 
Matching your revolver, that's a different story, makes sense now, still an expensive proposition. Why not buy a BFR in 45/70 to match your Marlin?
 
ben hunchak said:
Matching your revolver, that's a different story, makes sense now, still an expensive proposition. Why not buy a BFR in 45/70 to match your Marlin?
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Now there's a thought :D And to be honest the BFR in 45-70 is a pussy-cat with factory 45-70 loadings.

Tried out the the BFR at Phoenix in Edmonton, needless to say it was begging for some hotter loads.

A fine revolver on all fronts too, come on now X-mas is coming maybe Santa will be extra nice to you ;)
 
Whats the performance numbers of a 460 in a carbine length barrel?
The info I have found is for a pistol barrel.
Be nice to know what it actually is.
 
Only if you download the 460 S&W !!!

The 460 has a design max average pressure of 65,000 psi, and the Marlin action is good for around 45,000 psi (the 450 Marlin). The bolt doesn't have massive locking lugs, just two itty bitty pieces of the lever holding the bolt in place.
 
As mentioned you won't do it with the Marlin and keep the cost anywhere near reality. However Rossi makes a lever gun chambered in .454 Casull that is a really sweet shoulder thumper. Since they all share the same parent case and bore size this could conceivably be reamed out to .460. Then of course you'd also need to alter the action to be able to handle the longer cartridge.

The BIG issue then becomes the cartridge pressures and safety since full house .460 has chamber pressures well above those of .454Casull. Perhaps just "share" with .454 being the common ammo to avoid any nasty surprises on the part of the lever gun potentially blowing up. The power from the Casull rounds overlaps what the .460 generates when you look over the reloading data so it's not like you're giving up THAT much.

And if you ever sold the gun any subsequent new owners would need to obey the same limit. But it seems like an open bear trap waiting to endanger someone at some point. Likely safer just to make your "shared" ammo the stock .454Casull round and only use the .460 in the revolver.
 
BCRider said:
A
The BIG issue then becomes the cartridge pressures and safety since full house .460 has chamber pressures well above those of .454Casull.
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I was curious and looked it up. The 454 Casull also has a SAAMI max average pressure of 65,000 psi. However I believe that most factory cartridges are loaded a bit below this, around 50,000 CUP. Note that psi and CUP are not the same, with 50,000 CUP around 55 to 60,000 psi.
 
I went by the quick eyeball average in the reloading page for Hodgdon powders. The quick eyeball max for .454 was in the low 50K range while the .460 was up in the high 50's to low 60's K range. If the difference in the SAMMI maximums is closer then it may not be an issue.
 
Easiest answer is to go for a single shot T/C Encore/Prohunter and get a 460S&W barrel for it.

I've matched all of my handguns that I shoot with rifles so understand your desire.

10mm = Colt Delta Elite/G20/G29 = 18" 10mm T/C Contender carbine barrel
45 Colt = Ruger Bisley Vaquero's = 14" 45 Colt T/C Contender carbine barrel
454 Casull = Ruger Super Redhawk = 20" 454 Casull barreled LSI Puma M92 (also shoot 45 Colt in handgun/rifle)

:canadaFlag:
 
SandRoad said:
Only if you download the 460 S&W !!!

The 460 has a design max average pressure of 65,000 psi, and the Marlin action is good for around 45,000 psi (the 450 Marlin). The bolt doesn't have massive locking lugs, just two itty bitty pieces of the lever holding the bolt in place.
Click to expand...

The 366 action has a pretty big locking lug, actually - it's just that it's at the rear of the bolt. The lever doesn't retain the bolt in fireing, it just pushes the locking lug up. Being a rear-locking action, it is subject to some bolt deflection when fired. When Marlin retooled for the 450M, they started cutting all receivers with a stronger barrel thread and shorten the amount that headspace opens up when the bolt deflects under a heavy load. Prior to this, the max usable pressure was about 35000 CUP. Now it's good for something like 40000CUP before groups start to really open up due to bolt deflection. YMMV. They are proofed much higher. They shoot like crap if you load them up much higher also.

Unfortunately, these stronger barrel threads removed a lot of material from the thin area of the receiver between the magazine tube opening and barrel opening. This is where the receiver typically fails. To shoot full house 460S&W, you'd have to weld up the top of the existing mag tube opening in the receiver and drop the mag tube enough to thicken the receiver at this point. Then you would probably have to futz with carrier geometery to get it to feed from the mag. If a fella was handy with a tig, it wouldn't be too bad.

BTW - rechambering for the casull would be more or less the same thing.

Getting the feed right isn't a big deal - you might have to make a new carrier after figuring out the geometery with some JB weld and dummy ammo. Not a big deal at all. It's the pressure you'd need to worry about.
 
yup

The bore size not matter, 460S&W can shoot in 45-70 barrel , but matching the caliber was a waste since 45-70 is an more efficiency hunting ammo than 460 s&w, both in accuracy and range .Most of the time for backup in hunting, I just had a 10 mm handgun and is more than enough to kill a dear size in 50 yards range .
 
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