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Posted: 5/1/2015 11:04:06 PM EDT
| Is A1680 generally a dirty powder? I finally got some fairly recently and also got my suppressor recently approved. Only shot about 30 rounds, functioned perfectly, no blow back, but took well over an hour to clean my gun today (dirtiest i have ever seen any of my rifles).. It's a 10.5" blackout and i was using both 10.5 and 11 grains (both sub)(and again shooting suppressed). Everything on rifle was very dirty, surprisingly with the exception of the barrel which i stopped after 3 patches. Is that the 1680 or just my first experience begin suppressed? |
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Is A1680 generally a dirty powder? I finally got some fairly recently and also got my suppressor recently approved. Only shot about 30 rounds, functioned perfectly, no blow back, but took well over an hour to clean my gun today (dirtiest i have ever seen any of my rifles).. It's a 10.5" blackout and i was using both 10.5 and 11 grains (both sub)(and again shooting suppressed). Everything on rifle was very dirty, surprisingly with the exception of the barrel which i stopped after 3 patches. Is that the 1680 or just my first experience begin suppressed? Suppressors ...... back pressure.... dirty... just physics. Not the powder. I run my YHM phantom 30 cal on all my 22 and 30 cal rifles. Lots of different powders but the bolts all look the same.. BLACK I started converting what I could to piston. OMG so much cleaner... but $$$ I even ran the same can on my Vepr in x54... Holy SH!T how dirty that is. That's got a piston too... My face would be black. So, yeah. Normal stuff. If you have a NiB carrier, you can remove the black with a "Lead Removing Pad". But IMO, it's wasted effort for each cleaning.. Just keep it clean and oil'ed. I am about to test a new piston... I picked up the Syrac Ordnance Mid-length for a 6.5 grendel. I have two of the rifle lengths on pre-order: SYRAC ORDNANCE at Brownells Sorry, I guess I am drifting off the reloading topic but figured I would offer some help. Lastly, test it yourself.. I know you don't want to but run the first 30 rounds without the suppressor.. Check upper out, cleaner? Probably a lot. Good luck! |
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You shooting through a suppressor? Quoted:
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I use 1680 in my 17 Hornet reloads and I don't think it is a dirty powder. It might be due to the case capacity though as 10.6 grains is about 90% in a 17 Hornet You shooting through a suppressor? That has little to do with the OP's question and part of it was "is it generally a dirty powder" and in my experience it is not a dirty powder when used in the 17 Hornet and I have fired a 100 or so rounds through it since I last cleaned and I won't clean the barrel until the accuracy is negatively affected |
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Quoted:
Is A1680 generally a dirty powder? I finally got some fairly recently and also got my suppressor recently approved. Only shot about 30 rounds, functioned perfectly, no blow back, but took well over an hour to clean my gun today (dirtiest i have ever seen any of my rifles).. It's a 10.5" blackout and i was using both 10.5 and 11 grains (both sub)(and again shooting suppressed). Everything on rifle was very dirty, surprisingly with the exception of the barrel which i stopped after 3 patches. Is that the 1680 or just my first experience begin suppressed? 10.5 - 11gr, What bullet weight? |
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The increased backpressure from running a suppressor will blow more crap back into the action with just about any powder, but a larger part of what you're seeing is simply due to the much lower pressures of subsonic vs supersonic loads. Most powders will burn somewhat "dirtier" and less efficiently at lower pressures.
Typical pressures for supersonic .300BLK loads are in the 45K-55K psi range, whereas subsonic loads can be less than 25K psi. As an example, I have used A5744 for both sub and super loads in the Blackout. 5744 isn't particularly dirty in my supersonic loads, but with subsonics it is absolutely filthy, leaving unburned granules of powder everywhere and even blowing them out the ejection port (5744 is a VERY coarse extruded powder, so they're easy to see lying on my shooting mat). I have not used 1680, since I have been unable to get my hands on any, but from what I have read about it, it is in fact very dirty in subsonic loads. If you use 1680 for supersonic loads, you will likely find it to burn much cleaner. There are cleaner choices for subs, especially since you have a pistol length gas system (I'm assuming because of the 10.5" barrel and the fact that it runs). If you want something cleaner, try IMR4227. I have found IMR4227 to be considerably cleaner than A5744, and I have seen people on the internet say that 5744 is cleaner than 1680, but its hard for me to imagine how that can be. Maybe its just as well I don't have any. |
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The increased backpressure from running a suppressor will blow more crap back into the action with just about any powder, but a larger part of what you're seeing is simply due to the much lower pressures of subsonic vs supersonic loads. Most powders will burn somewhat "dirtier" and less efficiently at lower pressures. This is correct. It is compounded for 1680 because it produces a higher gas volume than other comparables like 4227. This is good in that it will allow for more guns to cycle with a given charge (1680 is about all that can cycle subs with a carbine gas reliably). It is bad in that there is more gas to travel back into the action and foul the gun. |
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