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Discussion Starter #1
Well, it snowed like crazy again today so I decided to play with the 6.8 pistol. I started out with a 11" barrrel and a carbine gas and it works great with everything except 90gr TNTs and RE7, just a slight short cycle. I could use a plastic buffer to fix that little problem.
I installed a M2 aimpoint that works good out to 50yds but, it was more fun with a green laser shooting from any position. I wish it was FA.
Then I popped a 9.5" with a pistol gas system on my pistol lower and swapped the laser over. Holy crap! that thing is crazy shooting from the hip. So now I'm sending off the paper work to turn it into a SBR and slap a can on the front, talk about clearing house!
I wanted to mount a HK stock on it but, they are heavy so now I just need to find a light, short stock.
 

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Wow, Id like to see it when its completed!
 

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constructor said:
Well, it snowed like crazy again today so I decided to play with the 6.8 pistol. I started out with a 11" barrrel and a carbine gas and it works great with everything except 90gr TNTs and RE7, just a slight short cycle. I could use a plastic buffer to fix that little problem.
I installed a M2 aimpoint that works good out to 50yds but, it was more fun with a green laser shooting from any position. I wish it was FA.
Then I popped a 9.5" with a pistol gas system on my pistol lower and swapped the laser over. Holy crap! that thing is crazy shooting from the hip. So now I'm sending off the paper work to turn it into a SBR and slap a can on the front, talk about clearing house!
I wanted to mount a HK stock on it but, they are heavy so now I just need to find a light, short stock.
That is wierd that it short stroked with the RE7. Sounds like fun though. I think we are going in different directions. You are getting into SBR's and I'm getting into the long rifles. :D
 

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If you want I'll send you up a MagPul CTR stock. Its short and light. I don't if it will work with a pistol. Do the pistols systems use carbine extensions if not can you get the carbine stocks to work? If it works for you its yours. My AR is in the process of getting a new barrel and a PRS stock is in its future so the CTR will be collecting dust. Nice thing about getting a suppressor in 6.8 is it will now work on your 6.5, 6mm, and 6.5 rifles as well. The Reaper would be to hot for it though. You would need a 30 cal one for it. But all the rest will work.

Tim
 

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I'm getting the LWRC PSD 8" SBR and am looking at faster powders like H4198 and RE7. What do you think about H4227?
 

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4227 in Hodgdon and IMR is good. IMR is a tad faster then H. I have some coming. I have a suspicion that 1680 is going to be the best of all of them. 4227 is considered very close to 1680. 1680 is very hard to find as of late. Western Powders hasn't made new lots for a while but are do to do so soon. I think I may have found some though. If anyone knows where there is some in stock I would appreciate it.

You may want to look at Norma 200 and IMR 3031 as well. With those short barrels you want to stay with faster powders for sure. Other wise its slower velocity and flame thrower city. :shock: Since use of these short weapons is under 100 yards so BC isn't going to be a concern. I would use the Sierra's 90s instead of Speer's TNTs. They achieve higher velocities then the TNTs with the same charge. I believe their construction will expand and frag more violently as well. I can also find them cheaper then even the TNT value packs. For 110 I would use v-max or Hdy 110 OTMs from a terminal performance and price stand point. I hope the SSA FMJs are 90-110 they would be my first choice for plinking followed by Rem 100 PSP.

Tim
 

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Discussion Starter #7
rcrandall said:
I'm getting the LWRC PSD 8" SBR and am looking at faster powders like H4198 and RE7. What do you think about H4227?
If you use a pistol length gas system fast powders should cycle.
At 8" 94% of H4227 would be burnt.
3031 is course and a pain to cut.
Re7, 4227,1680 and 4198 would be the best IMO.
 

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I'm not sure where to start with the 4227 for load development and would appreciate any help on that. Of course, I still have a few months before I get the PSD so I'm not in a hurry.

I think the 100gr PSP would be a great bullet for shorter barrels as well sinvce soft points frag down to 1700 fps...or so. Plus the 100's are so accurate.
 

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Discussion Starter #9
For the 100psp from a 8 " barrel-I set the max pressure at 55k anything that gets close to 55k will say Dangerous load because I set the max pressure at 55k. I set my personal loads to 60k
Powder type* Fill Ratio* Charge * Charge Vel. *Prop.Burnt *P max * P muzz * B_Time
% Grains Gramm fps % psi psi ms
--------------------------------- -----------------------------------------------------------------

Norma 200 100.5 26.7 1.73 2183 91.8 55000 21314 0.556 !DANGEROUS LOAD-DO NOT USE!
Winchester 296 81.3 22.4 1.45 2179 96.7 55000 20212 0.554 !DANGEROUS LOAD-DO NOT USE!

Alliant Reloder- 7 97.4 24.2 1.56 2157 97.3 55000 19977 0.566 !DANGEROUS LOAD-DO NOT USE!
Hodgdon Lil'Gun 81.5 21.7 1.41 2156 100.0 55000 18163 0.556 !DANGEROUS LOAD-DO NOT USE!

Hodgdon H4227 97.6 22.9 1.48 2154 95.8 55000 18833 0.535 !DANGEROUS LOAD-DO NOT USE!
Hodgdon H335 105.0 29.4 1.90 2146 82.3 53025 20749 0.541 ! Near Maximum !
Nitrochemie A/S 0200 88.5 22.7 1.47 2146 96.6 55000 18887 0.547 !DANGEROUS LOAD-DO NOT USE!

Accurate 5744 90.7 21.7 1.41 2145 92.9 55000 18962 0.535 !DANGEROUS LOAD-DO NOT USE!
Hodgdon H110 82.4 22.6 1.47 2145 98.6 55000 18815 0.554 !DANGEROUS LOAD-DO NOT USE!
SF-033 fl 105.0 27.5 1.78 2143 92.0 48758 21503 0.571 ! Near Maximum !
Vihtavuori N120 105.0 24.6 1.59 2139 96.7 52464 19266 0.553 ! Near Maximum !
Accurate 1680 90.9 25.0 1.62 2137 88.1 55000 19257 0.538 !DANGEROUS LOAD-DO NOT USE!
IMR 4227 96.4 22.6 1.46 2137 94.9 55000 18378 0.534 !DANGEROUS LOAD-DO NOT USE!
Accurate 2200 102.2 26.6 1.72 2132 83.1 55000 19436 0.537 !DANGEROUS LOAD-DO NOT USE!

Hodgdon H4198 103.1 24.8 1.61 2120 86.3 55000 18604 0.534 !DANGEROUS LOAD-DO NOT USE!
Ramshot X-Terminator 105.0 27.8 1.80 2118 83.6 50841 20337 0.557 ! Near Maximum !
Vihtavuori N110 92.5 20.1 1.30 2117 100.0 55000 16651 0.549 !DANGEROUS LOAD-DO NOT USE!
IMR 4198 105.0 24.1 1.56 2106 90.9 50403 18972 0.553
 

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Constructor,

Those aren't bad number to the 100 PSP as it becasue of its design is usually slower then most of the other 100s and 110s. It looks if you want the one with the best ratio on complete burn, case fill as velocity although they are all close on velocity it would seem Norma 200, Rel 7 and 4227 are all about even. The velocity diff are small enough to be masker by variance. I am surprised 4198 is so far down and 1680. Which makes me think 1680 may be very good in the longer barrels 12"-18". Its amazing x-term go in there with room left and lower pressure. But When you bump it up to 60K which puts you close to a real word 55k I bet it will look worse because of case capacity.

Could you run it again @ 65K for me?

You said long ago that when you went to 110% you started to lose vel. Was that with those specific powders or did you find it to be a general effect with most powders? I ask because I know extruded and balls tend to respond differently. Thanks

Tim

I am going to have to get back to working on getting this program for myself. My tax return might be a perfect excuse to lose a couple of bills. :roll:

Tim
 

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Discussion Starter #12
I am on a mission to see how many AR15 cartridges I can wildcat that will beat the famous british Grendel with Bills specified loads, so far I have 4 this year. There is a 6.8SPC ackley improved floating around too. Even my normal old 6.8 will shoot flatter than the Grendel to 500yards with some loads. I'll start working on the 6x41SPC again soon
 

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famous british Grendel

Id love to know where its "fame comes from" :roll:
 

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Discussion Starter #14
Cold said:
famous british Grendel

Id love to know where its "fame comes from" :roll:
They have been known to grow shrooms in england :mrgreen:
 

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constructor said:
Cold said:
famous british Grendel

Id love to know where its "fame comes from" :roll:
They have been known to grow shrooms in england :mrgreen:
You certainly get the award for one liners. Thats funny sh$t! :mrgreen: :mrgreen:

Cold,

At SHOT, I understand there wasn't an AA booth, were there any new companies fielding them in their line ups? I know Les Baer ( given their focus makes sense), and Sabre. Anyone else? Is anyone that doesn't presently field one showing they were adding them?

I would ask about the 6.8 but all major ones excluding Colt already do with Armalite adding it this year. The Grend guys had said Armalite was looking at adding 6.5s and not the 6.8 :shock: Since Armalite announced they would be adding a whole 6.8 line this year, I guess they made their choice.:lol:

The Grendel is a nice round but they made some decisions that hurt it. They may have had their reasons for taking the path they did but fact is it hurt its proliferation and improvement of the round.

With the correct 6.8 SPC barrel, that should have been used from the beginning, we can now actually reach the perfomance the SPC was suppose to reach. We have 130 @ 2575, 120 @ 2600, [email protected], [email protected], [email protected] all from a 16" barrels. Even those numbers possibly being surpassed by 100 fps with the use of 12:1 twist barrels. All of this with off the shelf powders and using mostly bullets designed specifically for the 270 win by hand loaders. It's plenty effective with factory loads but can do a lot more with proper hand loads performance and accuracy wise. This is one of the many things that makes the 6.8 so attractive.

Tim
 

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Has there been anymore testing done with a 6.8 AR Pistol? I was wondering if there were anymore information to post, or this is a project that was shelved? Esp since there was so much more done with the caliber since the last post in this thread.
 

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Discussion Starter #17
Raph said:
Has there been anymore testing done with a 6.8 AR Pistol? I was wondering if there were anymore information to post, or this is a project that was shelved? Esp since there was so much more done with the caliber since the last post in this thread.
I keep it close in case someone is stupid enough to break in here :lol:

I changed it to the 12" barrel with a carbine gas system, never did SBR it just left the pistol buffer on it. Aimpoint and laser with IR torch to work with NVD if needed.
 

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constructor said:
Raph said:
Has there been anymore testing done with a 6.8 AR Pistol? I was wondering if there were anymore information to post, or this is a project that was shelved? Esp since there was so much more done with the caliber since the last post in this thread.
I keep it close in case someone is stupid enough to break in here :lol:

I changed it to the 12" barrel with a carbine gas system, never did SBR it just left the pistol buffer on it. Aimpoint and laser with IR torch to work with NVD if needed.
Tell I'm getting tired, my grammer is getting bad... Sorry about that. So, how does she handle with the 12" barrel, and what do you have on the end of the barrel for a comp.?
 

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Discussion Starter #20
ron169 said:
H, Would this be a possibility using an Xtre.e barrel? I dont know if you order the barrels with the gas port already drilled or if you profile and drill it yourself.
I think could install a .625 GB at the carbine location and cut the barrel to 11 1/2" so I could use the mid gas boss to thread for the flash hider.


Raph,
I only used a comp on it once, it was kind of loud then decided a A2 would be better to keep it short although a Dpms Panther may work better for the flash. I have it loaded with hot 115gr Hornadys and it handles just fine and the fireball from the H335 will roast anyone I miss...or cauterise the wound.
 
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