Smith & Wesson 610-3 to 10mm magnum

[Mike D]

Has anyone bored their S&W 610 revolver to 10mm magnum?

I have no real practical reason to do this except for the added versatility.

Just not finding much info on what it would take to do this.


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[The_Shadow]

I remember some having reamed their cylinders deeper for the 10mm magnum.  I would expect that this would show lower velocities for the 10mm Auto as the bullet has further to jump to seal in the cylinder.  But yes some have done this modification...

[Mike D]

I remember some having reamed their cylinders deeper for the 10mm magnum.  I would expect that this would show lower velocities for the 10mm Auto as the bullet has further to jump to seal in the cylinder.  But yes some have done this modification...

Hmmm, I ain't as savvy on revolvers but wouldn't the jump be the same? Doesn't it seal at the forcing cone and not the cylinder?

I was really looking for info an a smith that might do this kind of work.

I can buy a new cylinder pretty cheap and would probably do the modifications on it and keep the one that came with the gun intact.


EDIT: Disregard. I was just edumacated on revolver cylinders.


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[Bimmer]

I'm planning on doing it.

So far I have a pint of MolyDee, 1,000 pieces of 10mm Mag brass (thank you, Starline), load data, and a pile of 200gr JHPs. 

I asked the S&W Performance Center and Bowen Classic Arms, and neither wanted to do it.  Bowen kindly referred me to Andy Horvath... 

If Horvath won't do it, then I'll probably rent or buy a reamer and do it myself. 

[TonyRumore]

It's about time one of the big manufactures resurrects the Herters 401 PowerMag.

Smith and Wesson needs to put it in the 4" Model 69.

Tony

[Mike D]

I'm planning on doing it.

So far I have a pint of MolyDee, 1,000 pieces of 10mm Mag brass (thank you, Starline), load data, and a pile of 200gr JHPs. 

I asked the S&W Performance Center and Bowen Classic Arms, and neither wanted to do it.  Bowen kindly referred me to Andy Horvath... 

If Horvath won't do it, then I'll probably rent or buy a reamer and do it myself.

Please let me know what Horvath says.


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[mr.revolverguy]

I am sure Mark over at Pinnacle will do it for you https://pinnaclehighperformance.com/

[Bimmer]

Please let me know what Horvath says.

Will do... 

For now I'm just casting about, trying to decide whether I want to ream it myself or send it out, and mostly distracted with other projects.

It's about time one of the big manufactures resurrects the Herters 401 PowerMag.

I don't get it...  Why not just go with .41 Mag, if you want a rimmed revolver cartridge? 

For me, the attraction of a 10mm revolver is that I can shoot .40 S&W in it, and virtuall all my other handguns are .40...

[Mike D]

Please let me know what Horvath says.

Will do... 

For now I'm just casting about, trying to decide whether I want to ream it myself or send it out, and mostly distracted with other projects.

It's about time one of the big manufactures resurrects the Herters 401 PowerMag.

I don't get it...  Why not just go with .41 Mag, if you want a rimmed revolver cartridge? 

For me, the attraction of a 10mm revolver is that I can shoot .40 S&W in it, and virtuall all my other handguns are .40...

Unfortunately I don't have the equipment and possibly the capability to do it myself.


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[Jim Bridger]

I have many S&W Mag revolvers. Maybe I am wrong but my preference  in the Wonder 10mm is a Semiauto. The local Ranch Supply has had a Ruger in stock for  6 Mos no interest. Maybe a member can up date this Old Fellow on 10mm revolvers?   

[Bimmer]

Unfortunately I don't have the equipment and possibly the capability to do it myself.

I'm not sure that I have the capability, either! 

In any case, I'll need to buy/rent a reamer.  I just bought myself a decent Starrett tap wrench... 

Maybe I am wrong but my preference  in the Wonder 10mm is a Semiauto. The local Ranch Supply has had a Ruger in stock for  6 Mos no interest. Maybe a member can up date this Old Fellow on 10mm revolvers?

The other threads in this subforum are probably better to get you up to speed on 10mm revolvers...  basically, yes, it's not called "10mm Auto" for nothing. 

Think of it as analogous to revolvers in .45ACP or 9mm. 

[sparkyv]

Pros: Most 10mm revolvers can also shoot 40S&W ammo.
Because the cartridge is of the rimless design, the use of a moonclip is usually required; cool, as it acts as a speedloader. BUT, the 10mm can be used without the moonclips (but not the shorter 40S&W rounds)..
10mm is a reloader's dream; easy to load, brass, powders, projectiles are very plentiful and varied.

Cons: Because the cartridge is of the rimless design, the use of a moonclip is usually required, and it's just another little piece you have to remember to take to the range, and is easily bent which can lock up the cylinder.  If you don't use the moonclips, the cases will not extract with the extractor rod...gotta pluck them out of rod them out.
Factory 10mm ammo is spendy.

I have many S&W Mag revolvers. Maybe I am wrong but my preference  in the Wonder 10mm is a Semiauto. The local Ranch Supply has had a Ruger in stock for  6 Mos no interest. Maybe a member can up date this Old Fellow on 10mm revolvers?   

This:

Think of it as analogous to revolvers in .45ACP or 9mm.

[shottist]

I bought a 10MM reamer about 10+ (MAYBE 15) years ago & reamed the cylinder deeper to chamber 10MM Magnum in a S&W 610.  I use Starline brass to load 10MM Magnum ammo.  The revolver will shoot 40 S&W, 10MM Auto & 10MM Magnum with moon clips.  From my Ransom Rest it is extremely accurate with all 3 cartridges.  Don't remember loosing velocity according to my chronograph.  IMHO an excellent modification, at least to me.

[Bimmer]

Where did you buy the 10mm reamer? 

Did you ream by hand, or with a drill press, or how?

[shottist]

I reamed by hand.  Been so long ago I don't remember where I bought the reamer.  I have loaned it out to others on this site and always gotten it back.  If you would like to borrow, let me know guypalmer@bellsouth.net and I will see if I can find it.