BigMoosie Posted May 28, 2015 Share Posted May 28, 2015 (edited) I've heard conflicting reports about what the best twist rate is for stabilizing a 147 grain bullet. Does anyone know? Most of the aftermarket barrel makers offer match barrels in 1-16 twist, which seem ideal for 115-124 grain bullets, but not for the 147. I'm looking to run 147 grain bullets through my G17, as I find this weight provides the most manageable recoil. Thanks Edited May 28, 2015 by BigMoosie Link to comment Share on other sites More sharing options...
entropic Posted May 28, 2015 Share Posted May 28, 2015 http://www.jbmballistics.com/cgi-bin/jbmdrag-5.1.cgi http://www.schuemann.com/Portals/0/Documentation/Webfile_Barrel%20Twist%20Rate.pdf 16 is enough to stabilize some really long pistol bullets. You'll be okay. Link to comment Share on other sites More sharing options...
BigMoosie Posted May 28, 2015 Author Share Posted May 28, 2015 (edited) http://www.jbmballistics.com/cgi-bin/jbmdrag-5.1.cgi http://www.schuemann.com/Portals/0/Documentation/Webfile_Barrel%20Twist%20Rate.pdf 16 is enough to stabilize some really long pistol bullets. You'll be okay. Thanks, it's just interesting to see that SilencerCo offer threaded Glock barrels in 1-10 twist. The 147 grain load I'm using runs at about 920 fps. Edited May 28, 2015 by BigMoosie Link to comment Share on other sites More sharing options...
bigtimelarry Posted May 29, 2015 Share Posted May 29, 2015 I have a KKM which is probably suppose to be the worst for 147 Gr. and i shot some Xtreme 147 Gr and got a 1" Group at 20 Yards.. Link to comment Share on other sites More sharing options...
BigMoosie Posted May 29, 2015 Author Share Posted May 29, 2015 I have a KKM which is probably suppose to be the worst for 147 Gr. and i shot some Xtreme 147 Gr and got a 1" Group at 20 Yards.. Thanks, what velocity? Link to comment Share on other sites More sharing options...
Jadeslade Posted May 29, 2015 Share Posted May 29, 2015 The stock Glock barrel works very well. !47 sub-sonic has been an AMU staple for years in pistols, and Dave Sevigny perfected the load when he was shooting Glocks. Lot of hoo hah on the net about stuff that has already been done and proven. Link to comment Share on other sites More sharing options...
BigMoosie Posted May 29, 2015 Author Share Posted May 29, 2015 (edited) The stock Glock barrel works very well. !47 sub-sonic has been an AMU staple for years in pistols, and Dave Sevigny perfected the load when he was shooting Glocks. Lot of hoo hah on the net about stuff that has already been done and proven. Thanks, I'll see what I can do with the OEM barrel. Just curious, didn't Dave Sevigny eventually swap to a KKM gunsmith fitted barrel towards the end of his involvement with Glock? Edited May 29, 2015 by BigMoosie Link to comment Share on other sites More sharing options...
bigtimelarry Posted May 29, 2015 Share Posted May 29, 2015 My 147 Xtremes were running about 935 fps out of my Glock 34. Dave Sevigny I think only used KKM's for the Bianchi Cup only and I think they were fitted by John Nagel. Link to comment Share on other sites More sharing options...
BigMoosie Posted May 29, 2015 Author Share Posted May 29, 2015 (edited) My 147 Xtremes were running about 935 fps out of my Glock 34. Dave Sevigny I think only used KKM's for the Bianchi Cup only and I think they were fitted by John Nagel. Thanks, that sounds like you were running the same load he was with the 147. Interesting to see that Sevigny felt the need to go to a match fitted KKM for the Bianchi, and counters the mantra of many Glock users who say the OEM barrels are plenty accurate. I've struggled to get better than a 3.5 inch groups off hand with my G17 at 25yds, where as out of my 1911s or wheelguns I can shoot half that or tighter. From what I've seen gunsmith fitted Glock barrels deliver, and can be tuned to function reliably. It looks like Barsto however is the only barrel maker making gunsmith fit barrels for the Glock; KKM only offer drop-in's now apparently. None of the makers apart from SilencerCo, with their threaded barrels, offer 1-10 twist barrels for the Glock, obviously for the 147 and subsonic stability. Interestingly, KKM, Barsto and others only offer 1-16 in their threaded drop-in offerings so you have to wonder how good they are shooting 147s. Edited May 29, 2015 by BigMoosie Link to comment Share on other sites More sharing options...
bigtimelarry Posted May 29, 2015 Share Posted May 29, 2015 The Bianchi Cup has 50 yard Targets and is all about accuracy, thats the only reason they used KKM Fitted. Link to comment Share on other sites More sharing options...
Whitefish Posted May 30, 2015 Share Posted May 30, 2015 Briley in Houston still manufactures gunsmith fit barrels for Glocks, as well as BarSto. My experience is that the Briley barrels needed about as much fitting as the BarSto and were short chambered. Perhaps that has changed now, but it was true a couple of years ago. The Briley Glock barrels are also a 1 in 16 twist rate. When I called them to ask why they ceased making gunsmith fit Glock barrels, KKM told me they quit making them because they had too many screwed up barrels come back with complaints from "amateur" gunsmiths. Link to comment Share on other sites More sharing options...
bigtimelarry Posted May 30, 2015 Share Posted May 30, 2015 Briley in Houston still manufactures gunsmith fit barrels for Glocks, as well as BarSto. My experience is that the Briley barrels needed about as much fitting as the BarSto and were short chambered. Perhaps that has changed now, but it was true a couple of years ago. The Briley Glock barrels are also a 1 in 16 twist rate. When I called them to ask why they ceased making gunsmith fit Glock barrels, KKM told me they quit making them because they had too many screwed up barrels come back with complaints from "amateur" gunsmiths. Yep.. That's what KKM told me too a while back. Link to comment Share on other sites More sharing options...
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