Mac.308 Posted April 1, 2017 Report Share Posted April 1, 2017 Afternoon everyone, I'm wondering if anyone has Chrono date on GGG 7.62 through a 16inch 1 in 11 barrel? Just looking for a rough SWAG starting point until I can chrono. Thanks Link to comment Share on other sites More sharing options...
Will0 Posted April 1, 2017 Report Share Posted April 1, 2017 Not exactly what you want, but I have chrono'd a friends doing 2770 from a 20" at 10* Celsius. Hope it can give you something to work from if nobody else has data Link to comment Share on other sites More sharing options...
Deserttech Europe Posted April 1, 2017 Report Share Posted April 1, 2017 It does 2550 from my 1in 8 16" Link to comment Share on other sites More sharing options...
Mac.308 Posted April 2, 2017 Author Report Share Posted April 2, 2017 Cool thanks. At least its ballpark. Link to comment Share on other sites More sharing options...
Deserttech Europe Posted April 2, 2017 Report Share Posted April 2, 2017 just to let you know, that for the 175smk load. Link to comment Share on other sites More sharing options...
Mac.308 Posted April 2, 2017 Author Report Share Posted April 2, 2017 Ah ok. Link to comment Share on other sites More sharing options...
gbal Posted April 2, 2017 Report Share Posted April 2, 2017 Mac_Google "308 MV loss with short barrel" There are a few good controlled such exercises. Loss varies a bit with cartridge loading,and just which inches come off,but 22fps per inch is a ball park guide average.If anything a tadmore as 16" is barely 'all burned' in some loads. gbal Link to comment Share on other sites More sharing options...
Mac.308 Posted April 19, 2017 Author Report Share Posted April 19, 2017 Just to kind of close this down, I've been to the range and chrono'd... 13.5 deg c Sea Level 1 in 11.25 twist SS barrel 2698 2690 2715 2709 2702 Link to comment Share on other sites More sharing options...
Deserttech Europe Posted April 19, 2017 Report Share Posted April 19, 2017 Wow that fast from a 16" barrel, and thats definitly the 175gr ammo? Link to comment Share on other sites More sharing options...
bradders Posted April 19, 2017 Report Share Posted April 19, 2017 Wow that fast from a 16" barrel, and thats definitly the 175gr ammo? No Ewen, it's M80 type 147gn FMJ ball ammo Link to comment Share on other sites More sharing options...
Cad Monkey Posted April 19, 2017 Report Share Posted April 19, 2017 GGG (168Gn.) does 2535 fps through my 16" LMT (1:11.25 twist) Link to comment Share on other sites More sharing options...
gbal Posted April 19, 2017 Report Share Posted April 19, 2017 Taking ball park 22 fps per barrel inch,so 176 fps loss in 16 inch barrel ;and SAAMI 24" barrel MVs: 175g @ 2600 gives. (2600-176)fps which is. 2424 fps 168g @ 2700 gives (2700-176)fps, which is 2520 fps 147g.@ 2800. gives. (2800-176)fps,which is 2620 fps NATO spec may be loaded a bit faster, 22fps/inch is an average over barrel length figure,and barrels vary a bit.The SAAMI MVs are derived from far more rounds,on probably more reliable instruments. gbal Link to comment Share on other sites More sharing options...
John MH Posted April 19, 2017 Report Share Posted April 19, 2017 Where did you get that from? Link to comment Share on other sites More sharing options...
Mac.308 Posted April 19, 2017 Author Report Share Posted April 19, 2017 Bradders is bob on. 147gr cheap as chips GGG. Not match etc. Local RFD had some. Not mega " one hole" ammo, roughly 1.5 to 2 moa. The rifle itself with other ammo is a "one holer"... sub moa with 155gr HBC @ 2360fps Link to comment Share on other sites More sharing options...
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