SteelCityShooter Posted June 13, 2020 Share Posted June 13, 2020 I have two 5" M&P9 2.0 pistols, one is the original FDE version from 2017 and the other a brand new CORE model. The older one will easily chamber my reloads using a Montana Gold 124 gr JHP with an OAL of 1.148". The newer one absolutely refuses to go into battery with these rounds and I had to shorten them to 1.120" to get them to chamber properly.Did S&W revise the M&P chamber specifications recently? Is there something wrong with the new gun? The new gun does chamber all of the factory rounds I've tried but it's strange that there is so much difference between it and the older model. Link to comment Share on other sites More sharing options...
mgkrs Posted June 13, 2020 Share Posted June 13, 2020 Is it just the barrel? Does it chamber if you swap barrels? Are there any markings on the bottom of the barrel? S&W sometimes uses dots to indicate barrel versions. Link to comment Share on other sites More sharing options...
BJB Posted June 13, 2020 Share Posted June 13, 2020 8 hours ago, SteelCityShooter said: I have two 5" M&P9 2.0 pistols, one is the original FDE version from 2017 and the other a brand new CORE model. The older one will easily chamber my reloads using a Montana Gold 124 gr JHP with an OAL of 1.148". The newer one absolutely refuses to go into battery with these rounds and I had to shorten them to 1.120" to get them to chamber properly.Did S&W revise the M&P chamber specifications recently? Is there something wrong with the new gun? The new gun does chamber all of the factory rounds I've tried but it's strange that there is so much difference between it and the older model. Remove the offending barrel and plunk the offending rounds. It's likely just a shorter leade in this barrel and nothing wrong with the gun or chamber. Also, 1.148" is getting kinda long for a JHP in a non-Open gun. Link to comment Share on other sites More sharing options...
SteelCityShooter Posted June 13, 2020 Author Share Posted June 13, 2020 5 hours ago, BJB said: Remove the offending barrel and plunk the offending rounds. It's likely just a shorter leade in this barrel and nothing wrong with the gun or chamber. Also, 1.148" is getting kinda long for a JHP in a non-Open gun. I did just that and they don't seat properly in the new barrel but do in the older one. It took seating the bullet to 1.120" to get them to "plunk" properly. Yeah, 1.148" is a bit long but it has worked in several other guns including a couple of Ruger SR's, a JP GMR-15 and a former M&P9 1.0 as well as the 2017 M&P9 2.0. so this was a surprise. That said, the SAAMI max. OAL for a 9 mm is 1.169" and I was well below that. Link to comment Share on other sites More sharing options...
BJB Posted June 13, 2020 Share Posted June 13, 2020 6 hours ago, SteelCityShooter said: I did just that and they don't seat properly in the new barrel but do in the older one. It took seating the bullet to 1.120" to get them to "plunk" properly. Yeah, 1.148" is a bit long but it has worked in several other guns including a couple of Ruger SR's, a JP GMR-15 and a former M&P9 1.0 as well as the 2017 M&P9 2.0. so this was a surprise. That said, the SAAMI max. OAL for a 9 mm is 1.169" and I was well below that. The SAAMI max of 1.169" is more for the dimensions of the magazine, not the leade of your barrel. You have found your new OAL and it's 1.12". If you load for a CZ, or Glock Gen 5, or Tanfoglio, etc......you'll find that your OAL requirement will likely be even shorter. 1.12" or 1.11" is a fairly common OAL for 124 JHP, not really short at all. You're good-to-go with that OAL. Link to comment Share on other sites More sharing options...
SteelCityShooter Posted June 14, 2020 Author Share Posted June 14, 2020 Oh, I wasn't worried about the shorter OAL, just puzzled that two "identical" guns had such different leade lengths. I wondered if S&W had made a design change. Link to comment Share on other sites More sharing options...
AZ1911 Posted June 26, 2020 Share Posted June 26, 2020 I have the same gun and I had to go 1.11 with mine. Link to comment Share on other sites More sharing options...
SteelCityShooter Posted June 26, 2020 Author Share Posted June 26, 2020 21 hours ago, AZ1911 said: I have the same gun and I had to go 1.11 with mine. This was a problem only with my Montana Gold 124 gr JHP loads. Reloads using Blue Bullet's 125 gr coated RN and Remington 124 gr JHP fit fine at 1.135" or a bit longer. I guess it's the bullet profile that controls what will work in this particular gun. Link to comment Share on other sites More sharing options...
dirtysanchez Posted June 30, 2020 Share Posted June 30, 2020 My original series1 took 125 conicals at 1.140 to just off the lands. The Apex barrel I replaced it with would only get to 1.100. I gave myself a bit more room with a throating reamer. Now they are at 1.130. Link to comment Share on other sites More sharing options...
rider82 Posted July 2, 2020 Share Posted July 2, 2020 I had the same issue, that taper in the hollow is very abrupt. I had to load at 1.1 to get them to chamber in an apex barrel. Link to comment Share on other sites More sharing options...
ClayBuster Posted July 15, 2020 Share Posted July 15, 2020 The only pistol I have that I need to load short for, I should probably get it reamed out. Link to comment Share on other sites More sharing options...
Tawadc95 Posted January 3, 2021 Share Posted January 3, 2021 I know I'm quite late on this but it's a new issue to me. I have 2 9mm Shields and 3 2.0 4" barrels, every gun but one a 2.0 chambers my reloads easily. The offending 2.0 seems to have a tighter chamber 3-4mm ahead of the extraction groove it always leaves marks on the brass there and is the only one of the 5 that does not plunk easily. Link to comment Share on other sites More sharing options...
SteelCityShooter Posted January 5, 2021 Author Share Posted January 5, 2021 On 1/2/2021 at 11:56 PM, Tawadc95 said: I know I'm quite late on this but it's a new issue to me. I have 2 9mm Shields and 3 2.0 4" barrels, every gun but one a 2.0 chambers my reloads easily. The offending 2.0 seems to have a tighter chamber 3-4mm ahead of the extraction groove it always leaves marks on the brass there and is the only one of the 5 that does not plunk easily. If the offending gun is marking the brass it got more than a short leade. I'd contact S&W and have the barrel corrected or replaced. they should fix it under warranty. Link to comment Share on other sites More sharing options...
Tawadc95 Posted January 6, 2021 Share Posted January 6, 2021 I'll give S&W a call about that, thanks Link to comment Share on other sites More sharing options...
MemphisMechanic Posted January 6, 2021 Share Posted January 6, 2021 (edited) On 7/2/2020 at 1:26 PM, rider82 said: I had the same issue, that taper in the hollow is very abrupt. I had to load at 1.1 to get them to chamber in an apex barrel. I had to ream my Apex barrel as well. I’ve also done quite a few factory 2.0 barrels for guys - they’re hardened steel and your average reamer will get destroyed because it’s softer than the barrel. 5th gen glocks, Shadow 2s, and M&Ps all have short chambers incredibly hard barrels which require a tungsten carbide reamer. So did half of my Walther PPQ & PPSs, for that matter: I don’t like loading to different lengths for different guns. That’s why I have a tungsten reamer now. Edited January 6, 2021 by MemphisMechanic Link to comment Share on other sites More sharing options...
andre3k Posted February 26, 2021 Share Posted February 26, 2021 On 1/6/2021 at 9:07 AM, MemphisMechanic said: I had to ream my Apex barrel as well. I’ve also done quite a few factory 2.0 barrels for guys - they’re hardened steel and your average reamer will get destroyed because it’s softer than the barrel. 5th gen glocks, Shadow 2s, and M&Ps all have short chambers incredibly hard barrels which require a tungsten carbide reamer. So did half of my Walther PPQ & PPSs, for that matter: I don’t like loading to different lengths for different guns. That’s why I have a tungsten reamer now. Where did you purchase your reamer from? I have 3 M&P's that I would like to ream the chambers on. Link to comment Share on other sites More sharing options...
MemphisMechanic Posted March 16, 2021 Share Posted March 16, 2021 On 2/25/2021 at 6:32 PM, andre3k said: Where did you purchase your reamer from? I have 3 M&P's that I would like to ream the chambers on. A guy here on Enos, @1911luvr. He hasn’t had any more of them made in some time - at least as far as I’m aware. Carbide ones are pretty expensive too. Link to comment Share on other sites More sharing options...
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