9mm forcing cone

[pantannojack]

We all often see questions about forcing cone cracking on M19 revolvers. Advice has been to avoid light (110-125g ) bullets at full power. It just dawned on me: What about the S&W 9mm K frame revolvers shooting 115g +p, and +p+ loads?

 

[SnidelyWhiplash]

Never heard of it being an issue. Since 9mm revolvers are not as common as .38 Spl./.357 Magnum revolvers there may not be a sample size large enough to have experienced the problem...if such a problem actually exists.

I wouldn't worry about it. I think it would take a lot of shooting to have such an issue occur...if it would at all. Different bullets...different propellents.

 

[gwpercle]

Must not be an big issue ... I have heard of no problems...
Do you have one with a cracked forcing cone ?
Gary

 

[Nevada Ed]

The Lyman manual has the .357 magnum minimum fps for Unique powder;
110gr at 1392fps and the 125gr low maximum load at around 1359fps.

My Lyman maximum 9mm load fps using Unique powd has the
115gr at 1233 and the 124gr at 1204fps out of my 5" pistol.

The 357 can get up to 1693 and 1506fps with slower burning powders
but they will not work in the short 9mm case, for high fps loads.

One reason, that I don't think it will ever happen, if using safe loading data.

 

[ArchAngelCD]

From what I know the problems with forcing cones in K frame .357 Magnums were in the older K frames with the clearance cut at the bottom of the forcing cone. They also showed up with the high velocity 125gr jacketed bullets, not any of the cast bullets or heavier jacketed bullets.

The L frame and the new K frames have solved that problem. The 9mm revolvers being sold by S&W today are 2X L frames and an N frame, not K frames. There will be no forcing cone problems with those guns. Shoot them at will and enjoy.

Do you have a 9mm K frame I'm not aware of? (of course I could be wrong, I'm not an expert) If you do have one please post the model number so I can take a look see.

 

[stansdds]

9x19mm case is far too small to make use of the very slow burning colloidal ball powder used in the full power 357 Magnum loads, so it's not a problem with the 9mm.

 

[Rock185]

The 110 grain .357 was actually a moderate load, and not the one suspected of cracking forcing cones. The culprit was the .357 125 grain. The 125 grain was what my Dept. issued for those carrying .357 revolvers. I did see a k-frame or two with damaged forcing cones, and one Python with a damaged forcing cone.

I've owned several 9mm revolvers, i. e., Ruger Blackhawk and SP101, S&W 547s, a 940 and a 686 conversion. I've used +P, +P+, NATO, and equivalent hand loads. I haven't put thousands of rounds through any particular 9mm revolver, but have certainly never seen any indication of degradation, or actual damage to any of the forcing cones..

 

[Bill Lear]

The new two-piece barrel with full round forcing cone is not subject to cracking by any sane, or known number of rounds.
The old screwed in barrels with crane cutaway were heavily stressed after being torqued into place.