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Pages 12 and 13 of the LCR Manual DOES recommend an "Ammunition Check" in accordance with procedures described in prior post by couzin.

Some 10+ years ago, I had an 11-ounce S&W in 38+P (342?) that was shot a lot (mostly with 130 grain FMJ non +P ammo) and never experienced the problem. Sold it to a lady friend in order to buy the "lastest and greatest" in 12-ounce 357. That is when the potential became so apparent when S&W had the warning on both the barrel and in their book on the Model 340. The +P LCR weighs in at 13 1/2 ounces. Many of the most popular Smiths are in the 15-ounce range. It's looking like around 15 ounces may be the "edge of the envelope" for some of the ammo manufacturers' "standard crimping" to withstand the recoil.

I do know with certainty that 15 ounce "threshold" is what has caused a whole lot of folks to shoot one of the 5-holers 5 times, then have it and 45 rounds of ammo "for sale".

salty1 came out this morning with a solid rod, tapped the bullet back down and had the cylinder open while I was tied up with arriving students. I'd e-mailed another buddy who had recently bought an LCR and (all that he could find) Fiochi 158 grain ammo (4 boxes). He'd fired 25 rounds successfully on Saturday. He came out again today and fired the rest of that box without any issues ...

Conversely, stamped on the barrel of my "old" 340PD is "No less than 120 GR bullet". When I got it years ago, per text in S&W owners manual, IIRC, I tested 8 types of .357 ammo. 5 out of 8 slipped enough to never lock up the cylinder, but certainly be of concern to limit what I fed it.

During a private class today, a doctor and his wife were trying out our new Ruger LCR (Lightweight Compact Revolver). They had brought their own ammo: Fiochi 158 grain FMJ (which was all they could find locally). The lady got off 5 rounds sucessfully, but did not like the recoil and was promptly "done with that one". I had just gone from the range to office to get some 130 grain bullets for her to try and left them alone for the husband to try a few rounds with it. When I got back to the range, he had fired 2 rounds and the gun was locked up. Round #3 had jumped the crimp to the point that cylinder would not turn or open. It appears that the bullet will have to be forced back into the casing about 1/8" to get the cylinder open. It's been a looooong day, so I just put the LCR away and will "deal" with it when more time ... Anyhoo, for those think the revolvers are always "5 for sure", that ain't necessarily so ... Murphy is alive and well.