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Posted: 10/1/2013 2:58:41 PM EDT
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im wanting to build a 6.5 grendel gun.i called j-t today and they have no barrels in stock.so after doing a little lookin i came across this barrel from model 1.im not sure if it is a grendel barrel though?if so is it any good?
http://www.model1sales.com/index.cfm?fuseaction=category.display&category_id=378 |
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The rifling and caliber would tell me yes but there isn't enough details to say yay or nay. I would call and ask or check out jp barrels. Their turn around isn't bad. Just be careful when looking into grendl because there are two types of bolts and some head space issues with one of them.
good deal |
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Quoted:
So are the model 1 barrels any good? I was wanting to build a 16 or 18 inch barrel gun. They are made by ER Shaw, best I can tell they are decent as it relates to quality and accuracy, I would go with a 20" or longer bbl. length to make the most of the cartridge, as it was originally designed for the longer bbl. lengths of 20"-24" with the 24" being optimal. YMMV. Good luck. |
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Quoted:
They are made by ER Shaw, best I can tell they are decent as it relates to quality and accuracy, I would go with a 20" or longer bbl. length to make the most of the cartridge, as it was originally designed for the longer bbl. lengths of 20"-24" with the 24" being optimal. YMMV. Good luck. Quoted:
Quoted:
So are the model 1 barrels any good? I was wanting to build a 16 or 18 inch barrel gun. They are made by ER Shaw, best I can tell they are decent as it relates to quality and accuracy, I would go with a 20" or longer bbl. length to make the most of the cartridge, as it was originally designed for the longer bbl. lengths of 20"-24" with the 24" being optimal. YMMV. Good luck. I dont know if this is entirely true, Bill himself said he cut down a 14.5 barrel to 10.5 and was still reaching out to 500 yards with it. |
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Quoted: They are made by ER Shaw, best I can tell they are decent as it relates to quality and accuracy, I would go with a 20" or longer bbl. length to make the most of the cartridge, as it was originally designed for the longer bbl. lengths of 20"-24" with the 24" being optimal. YMMV. Good luck. Quoted: Quoted: So are the model 1 barrels any good? I was wanting to build a 16 or 18 inch barrel gun. They are made by ER Shaw, best I can tell they are decent as it relates to quality and accuracy, I would go with a 20" or longer bbl. length to make the most of the cartridge, as it was originally designed for the longer bbl. lengths of 20"-24" with the 24" being optimal. YMMV. Good luck. Umm. Yeah. 
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Quoted:
I dont know if this is entirely true, Bill himself said he cut down a 14.5 barrel to 10.5 and was still reaching out to 500 yards with it. Quoted:
Quoted:
Quoted:
So are the model 1 barrels any good? I was wanting to build a 16 or 18 inch barrel gun. They are made by ER Shaw, best I can tell they are decent as it relates to quality and accuracy, I would go with a 20" or longer bbl. length to make the most of the cartridge, as it was originally designed for the longer bbl. lengths of 20"-24" with the 24" being optimal. YMMV. Good luck. I dont know if this is entirely true, Bill himself said he cut down a 14.5 barrel to 10.5 and was still reaching out to 500 yards with it. Yes, It still does well even in SBR lengths, but it was never originally designed for such short barrel lengths...Keep in mind the level of blast/report/flash is considerable in those barrel lengths w/o a suppressor, which few people want to deal with the paperwork/wait time/cost of such a set-up etc. Again, some people love the shorter/lighter set-up of the 14.5"-16.5" bbl'd carbine lengths for stalk hunting and general shorter distance shots say 100-400 yards, If that sets off your sear then all the more power to you...certainly nothing wrong with that at all...In my case I don't mind the extra length/weight of the longer barrel'd versions...YMMV. |
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My 18" ARP barrel keeps factory AMAX supersonic to 1000+ yards, as does my 20" Satern barrel and my 24" AA barrel. LRRPF52 has had repeatable hits to 1100 from his 16" Grendel. Bill A has posted multiple times about shooting 500+ with 14.5" and shorter barrels. I guess what I'm trying to say is, get whatever barrel length fits the purpose of the gun and don't worry about "optimal" length. |
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One thing to remember with the 6.5 Sporter chamber. it is NOT the same as the 6.5 Grendel. The Sporter chamber is a bit deeper so you are supposed to use a standard 7.62 x 39 bolt, not the actual Grendel bolt. Grendel has a .136 recess, the Sporter 7.62x39 bolts have a .125 recess |
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Yes, It still does well even in SBR lengths, but it was never originally designed for such short barrel lengths.... I read somewhere that the 6.5 Grendel was designed to burn all of the powder in 19". If true, I'd say that a 19-20" barrel would be the best compromise between performance and manuverability. I just built a 19" rifle. |
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Quoted:
I read somewhere that the 6.5 Grendel was designed to burn all of the powder in 19". If true, I'd say that a 19-20" barrel would be the best compromise between performance and manuverability. I just built a 19" rifle. Quoted:
Yes, It still does well even in SBR lengths, but it was never originally designed for such short barrel lengths.... I read somewhere that the 6.5 Grendel was designed to burn all of the powder in 19". If true, I'd say that a 19-20" barrel would be the best compromise between performance and manuverability. I just built a 19" rifle. Has to do more with powder capacity and the powders being used, etc., slower powders will normally require more barrel length to get a more complete burn... In general most modern rifle cartridges with ~ 55 grains or less will burn about 94%-98% efficient with a 20" Bbl... |
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Just so there is less conjecture about powder burn and barrel lengths.
The pressure peak for a normal rifle powder that is typical for the Grendel will occur at about the same place as that for a 5.56. This point is approximately 3/4" in front of the case mouth. At this point the propellant has burned such that the maximum pressure is achieved and the expansion of the combustion volume as the bullet moves away now drops the pressure faster than the burning powder can catch up. In essence the powder is all ignited and is now burning regressively after this point. In examining short barrel internal ballistics, as long as the critical ignition pressure is maintained for the burn time the powder will be exhausted. Contributions to velocity from longer barrels result from the pressure being able to act for a longer time but the powder is fully consumed. The exception is when the powder rapidly drops below the ignition pressure and the burn will now slow or even cease leaving partially burn powder to exit the barrel. That said the majority of the muzzle flash observed is the CO from the gas leaving the barrel burning at the edge of the shock wave bottle to form CO2. Returning to the Grendel the optimum barrel length to get the most velocity per inch is 19" to 20". That said the cartridge will burn the propellant correctly for barrels as short as 10.5" but the velocity is reduced. I would say that 16" is still very useful but have also used 10.5" to drop LaRue targets and poppers out to 600. A typical rule of thumb is that a more severe bottleneck case will provide pressure for longer so the longer barrels are of benefit and they drop performance more per inch in shorter tubes and typically run less bullet area for the pressure to act on. Straight cases do best in short barrels at the expense of gaining as much is in long barrels. They do typically have good bullet area so are efficient in converting pressure to velocity. But as consequence of the fast expansion are also more likely to drop pressure below what is needed to fully burn the powder. Obviously this is not directly applicable to pistol type casings as the burn rate and powder chemistry will tolerate lower pressures and so on with shotshells. |
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I have shot 10.5, 12.5, 14.5, 16, 18, 20, 24 and 28 inch barrel Grendels for fun and in competition.
My favorite lengths are 12.5 and 16 inches. The 16 does very well at 600 yards and acceptably well at 800 yards. Some may groan and gnash their teeth but one of my favorite AR uppers is a Model 1 Sales 5.56 gun with an ER Shaw barrel. It has been a great upper and I have zero complaints. Accuracy has been very good considering its a pencil barrel chromelined piece and I have shot it out to 530 yards or so. |
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Quoted:
Grendel has a .136 recess, the Sporter 7.62x39 bolts have a .125 recess Quoted:
Quoted:
One thing to remember with the 6.5 Sporter chamber. it is NOT the same as the 6.5 Grendel. The Sporter chamber is a bit deeper so you are supposed to use a standard 7.62 x 39 bolt, not the actual Grendel bolt. Grendel has a .136 recess, the Sporter 7.62x39 bolts have a .125 recess Thank you for reaffirming what I already posted. |
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Quoted:
My 18" ARP barrel keeps factory AMAX supersonic to 1000+ yards, as does my 20" Satern barrel and my 24" AA barrel. LRRPF52 has had repeatable hits to 1100 from his 16" Grendel. Bill A has posted multiple times about shooting 500+ with 14.5" and shorter barrels. I guess what I'm trying to say is, get whatever barrel length fits the purpose of the gun and don't worry about "optimal" length. On a warm day earlier in the summer, I was really surprised to get POA=POI at 1200yds at 4400ft ASL, but there was no wind. My program told me 14.4 mils, so I dialed and let her fly. The next 4 shots were right there as fast as I could pull the trigger. In those conditions, the program told me that I was supersonic out to 1318 yards. I have another 16", and an 18" on order with the Lilja group buy, so we'll see what I can come up with. Brownell's just sold a bunch of 14.5" Saber barrels, and someone here chrono'd and average of 2420fps with factory Hornady 123gr A-MAX. That's only 40fps average less than my 16", making me really think about an SBR Grendel now. http://www.ar15.com/forums/t_3_121/623880_Sabre_Defence_6_5_Grendel.html&page=1&anc=bottom#bottom |
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