Ub3RDoRK Posted May 10, 2012 Share Posted May 10, 2012 So I'm getting started on a G17 and picked up a threaded KKM barrel that came with a basic compensator. My question is what can I see in difference between different comps? 3-4+ ports? I am not quite sure what this gun is going to be primarily used for though. I currently shoot local steel matches and that's about it until I get more serious about uspsa. So knowing that can someone steer me into some info like power factor with different comps etc? Oh and it's a gen 4 G17. Thanks in advance. Link to comment Share on other sites More sharing options...
Torogi Posted May 10, 2012 Share Posted May 10, 2012 are you gonna use it for steel or uspsa? Link to comment Share on other sites More sharing options...
Ub3RDoRK Posted May 10, 2012 Author Share Posted May 10, 2012 Most likely steel. Link to comment Share on other sites More sharing options...
Noximus03 Posted May 11, 2012 Share Posted May 11, 2012 You will need a slower burning powder to get the true benefit of the comp, as it's designed to redirect the pressure and gasses in a direction that helps you keep the gun flat. it'll do it's job with factory ammo, but not as well. Oh....and try to keep your mouth closed when firing, lol! Link to comment Share on other sites More sharing options...
CocoBolo Posted May 11, 2012 Share Posted May 11, 2012 Get some 95gr Zeros and throw about 6gr of HS6 behind them, if that don't get it add another grain or two of powder. 115gr will work as well. My steel load is 5.6gr of Autocomp with 115gr Zero but get MTG CMJ's so you don't get led in the comp. I shoot sti but your tuppper ware should shoot them fine. Welcome to the dark side and nothing is more fun than an open gun in a steel match. Link to comment Share on other sites More sharing options...
EkuJustice Posted May 11, 2012 Share Posted May 11, 2012 what kind of comp did it come with Link to comment Share on other sites More sharing options...
Ub3RDoRK Posted May 11, 2012 Author Share Posted May 11, 2012 Thanks Cocobolo! Glad to join! It came with this one from KKM. I was thinking a Carver 4 port but I dont know enough of the difference. Link to comment Share on other sites More sharing options...
Braxton1 Posted May 11, 2012 Share Posted May 11, 2012 For Minor power factor loads, fewer ports is generally more efficient. For the comp to actually perform any work, it has to get a good flow of gases into it and out of it. If the ports are too big, that smaller volume of gases won't have much velocity coming out of the ports and won't work well. If the ports are smaller, but too numerous, the last few ports won't do anything. Link to comment Share on other sites More sharing options...
EkuJustice Posted May 11, 2012 Share Posted May 11, 2012 that comp looks like it would work well for minor PF ammo Link to comment Share on other sites More sharing options...
Ub3RDoRK Posted May 12, 2012 Author Share Posted May 12, 2012 im trying to get it to shoot as flat as possible...would i benefit from a larger comp with a higher grain to obtain that? Link to comment Share on other sites More sharing options...
BlueOvalBruin Posted May 12, 2012 Share Posted May 12, 2012 I shoot with a guy who uses that comp with autocomp, the gun looks really flat so I would give that a try first. Link to comment Share on other sites More sharing options...
Sarge Posted May 12, 2012 Share Posted May 12, 2012 Get some 95gr Zeros and throw about 6gr of HS6 behind them, if that don't get it add another grain or two of powder. You mean another tenth or two right? Link to comment Share on other sites More sharing options...
Neomet Posted May 12, 2012 Share Posted May 12, 2012 That is plenty of comp for minor PF. I have a couple friends who just run hybrid barrels with no comp for their SC guns and are stunningly flat and soft to shoot. Bigger is not always better with comps. Link to comment Share on other sites More sharing options...
warpspeed Posted May 12, 2012 Share Posted May 12, 2012 im trying to get it to shoot as flat as possible...would i benefit from a larger comp with a higher grain to obtain that? No. Not really. The comp really comes into play when you are pushing for major velocities. In minor or loads designed for steel, getting the load as soft & flat as possible will happen all on its own. My current open gun is a Glock 17 and it has no comp, just a ported barrel. At 125 - 135 pf, it is plenty flat. Link to comment Share on other sites More sharing options...
Ub3RDoRK Posted May 12, 2012 Author Share Posted May 12, 2012 im trying to get it to shoot as flat as possible...would i benefit from a larger comp with a higher grain to obtain that? No. Not really. The comp really comes into play when you are pushing for major velocities. In minor or loads designed for steel, getting the load as soft & flat as possible will happen all on its own. My current open gun is a Glock 17 and it has no comp, just a ported barrel. At 125 - 135 pf, it is plenty flat. Ok good info. I guess i need to play with different loads. Link to comment Share on other sites More sharing options...
Aircooled6racer Posted May 12, 2012 Share Posted May 12, 2012 Hello: I had a Glock 17 with that same comp and my steel load was 7.8grains of HS-6,Montana Gold 95grain 380 bullets with a 1.100" overall length. I still use this load for my 5" 2011. Works great. Thanks, Eric Link to comment Share on other sites More sharing options...
Ub3RDoRK Posted May 12, 2012 Author Share Posted May 12, 2012 wow, shows how new i am....I assumed lower powder made less recoil. I didnt think such a powerful load could produce good results with a compensator. I havent shot my 17 yet since im still waiting for it and just assembling a parts list in my head of what I would like to get. It sounds like I wont need to change the comp. Link to comment Share on other sites More sharing options...
superdude Posted May 12, 2012 Share Posted May 12, 2012 wow, shows how new i am....I assumed lower powder made less recoil. I didnt think such a powerful load could produce good results with a compensator. I havent shot my 17 yet since im still waiting for it and just assembling a parts list in my head of what I would like to get. It sounds like I wont need to change the comp. lower powder does mean less recoil. however, compensators love gas. the key is to use a gunpowder that uses more gunpowder (weight) for the same velocity. more gunpowder weight = more gas = more force diverted through the ports to reduce recoil (muzzle climb). that's why slow gunpowders are preferred for use in compensated pistols. they require more weight to produce the same velocity as fast gunpowders. Link to comment Share on other sites More sharing options...
shred Posted May 12, 2012 Share Posted May 12, 2012 FWIW, Autocomp steel loads are one of the very very few 'bad' loads in my Super. They throw a poor group and every so often one way out of it. I was sure my barrel had finally burnt out when I tried to sight some in. Lucky I had some Titegroup loads with everything else the same around to return me to sanity. AC worked great in my Modified .40 though. Go figure. The reason slow powders are used to make Major in open guns is they can't make major safely with fast powders. Because of that, comps are designed to work with the slow powders. There's not any real reason you couldn't comp a fast-powdered load if you could get a safe one. You would want a different comp design. Link to comment Share on other sites More sharing options...
superdude Posted May 12, 2012 Share Posted May 12, 2012 (edited) The reason slow powders are used to make Major in open guns is they can't make major safely with fast powders. Because of that, comps are designed to work with the slow powders. There's not any real reason you couldn't comp a fast-powdered load if you could get a safe one. You would want a different comp design. what design changes would be appropriate for use with fast gunpowders? more ports maybe? Edited May 12, 2012 by superdude Link to comment Share on other sites More sharing options...
sarpau Posted May 13, 2012 Share Posted May 13, 2012 (edited) I don't know the first thing about computational fluid dynamics, but if I were to guess I would say fast powder loads would need a comp with smaller ports, and probably fewer. Less powder = less gas, so I'd think you want smaller ports to create a more powerful pulse of upwards gas to act upon your muzzle. Its like putting your finger in front of a slow running hose of water. the more you constrict it, the more velocity the water escaping has due to the pressure build up And fewer ports because by the time you have reached the second or third port, all usable gas has pretty much gone out the earlier ports. Again, just my guess. Someone will be along to agree or tear my theory up. Edited May 13, 2012 by sarpau Link to comment Share on other sites More sharing options...
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