Author Topic: Twin Cylinder .308 (Read 6673 times))

sixshootertexan · « **Reply #60 on:** May 31, 2015, 07:41:08 PM »

More Pics.

Rdsail · « **Reply #61 on:** May 31, 2015, 07:47:36 PM »

looking great! What a nice execution!

Monkeydad1969 · « **Reply #62 on:** May 31, 2015, 07:52:54 PM »

Very nice, Ricky.

When should I expect delivery?

Joe

QVTom · « **Reply #63 on:** May 31, 2015, 11:09:06 PM »

That's beautiful Ricky. And the bluing look great! CONGRATS!

Tommy · « **Reply #64 on:** May 31, 2015, 11:53:38 PM »

Most beautiful Rick Well done
Tom

William · « **Reply #65 on:** June 01, 2015, 12:32:06 AM »

That is a fine piece of art that is for sure. Would love to have something that looked that good. You have done an outstanding job.

Just out of curiosity, how heavy is it?
And let us know how she groups!

Excellent Job,

William

sixshootertexan · « **Reply #66 on:** June 20, 2015, 04:23:50 PM »

Ok I got to poke holes in some paper today. First let me say I have to get a bigger bottle. I went and filled my Ninja 90ci at the paintball field. They only got to 4100psi and by the time I got home and it cooled it was 3900psi. So that's where I started today at 3900psi but the regulator was acting up again and only putting out 2700psi. So all this data was gathered tethered at 2700 and lower psi. I'm using the new 12.5lb spring I installed. Until I get a reliable air source I don't know what I can get out of it. The 79's didn't group well but the 95's seemed better. The 110's seemed the best so far.

79gr BBT 95gr BBT 110gr BBT
994 928 871
989 923 869
980 915 864
982 910 918
980 909 865
974 861
976
970
973
973

50yd target 110gr BBT

100yd Target 110gr BBT

QVTom · « **Reply #67 on:** June 20, 2015, 05:17:46 PM »

The 110 gn BBTs are showing excellent promise. One thing you learned is you are going to need a lot more air on hand LOL. I learned this the hard way too.

Nice work!

Tom

rsterne · « **Reply #68 on:** June 20, 2015, 07:36:18 PM »

In case you didn't know, that is about the same power as a .308 DAQ Exile.... Mine shot 835 with a 118 gr. Lee FN.... I would say you will definitely want 95-110 gr., the 79 gr. will likely be too light for that gun....

Bob

sixshootertexan · « **Reply #69 on:** June 20, 2015, 08:34:05 PM »

I'm concerned about the 1-20 twist rate. I'm I exceeding the fps for this bullets with this twist rate? I can go back to the 10lbs spring if I need to.

rsterne · « **Reply #70 on:** June 20, 2015, 11:09:01 PM »

Likely not a problem, considering the groups you are getting.... The calculations say an 18" twist for the 110 gr., but what I am learning is that the boattail compensation in the twist calculator I am using (Kolbe) seems to overcompensate on rebated boattails.... Every one I have designed, so far, works in a slower twist than the theory suggests.... So, if it works and is accurate, don't worry about it....

Bob

sixshootertexan · « **Reply #71 on:** June 20, 2015, 11:20:33 PM »

Ok think I'll try some as cast next time. Do you think a lube is needed?

sixshootertexan · « **Reply #72 on:** July 02, 2015, 06:35:06 PM »

Ok did some more testing today at 100yds. Wind was 11mph with gust.
Tried some as cast 110gr and they just shotgunned.
Went back to the sized to .308 had a 2" group.
I tried unsized and lubed with Hornady One Shot shotgunned with those.
After that I was just throwing lead downrange and was hitting a 6" gong at 150yds No pics ok but it was fun.
Efficiency

100yd .308 sized

Monkeydad1969 · « **Reply #73 on:** July 03, 2015, 02:21:27 AM »

Right on. Any 200 yard shots in your future?

Joe

LeadBreakfast · « **Reply #74 on:** July 03, 2015, 06:19:46 AM »

Boy is this thing cool! Fantastic machine work and execution with help from some of GTA's finest. A beautiful gun that looks to perform as well. Hope to see some long range groups soon!

Rdsail · « **Reply #75 on:** July 03, 2015, 08:55:03 AM »

Very nice!!!!

moorepower · « **Reply #76 on:** August 08, 2015, 10:35:09 PM »

What size valve throat and exhaust did you end up with?

sixshootertexan · « **Reply #77 on:** August 08, 2015, 11:58:00 PM »

My thumb drive that I was using to take my drawings to and from work messed up. I keep forgetting to transfer them to a new drive because the drive works at work but not on my home computer. I think Windows 7 at work did something to it. Going thru my notes I think the throat was .3125 and the exhaust was .232.

Tofazfou · « **Reply #78 on:** September 21, 2015, 09:19:54 PM »

GREAT WORK and sorry i'm late to the party.

What a gorgeous gun sir. I've read all the pages from beginning to now and i'm speechless and so envious. Wish i had the proper tooling to build my own gun.

If you have the TJ 1-20" twist barrel, you should see some good grouping with 115-150 gr bullets also. I had that same barrel on my original Corsair 308. I bought a RCBS 150 gr FP mold (not the cowboy one but the other one) and had it HP'd and OH MY gosh that bullet was accurate. RJ porter at http://www.accuratebigboreairgunammo.com/ now owns that mold for ME. He has a good selection of 308 bullets to try.

ronbeaux · « **Reply #79 on:** September 21, 2015, 09:54:48 PM »

That is just the most coolest build I have seen! Great job done by a really nice family guy. Hope to see you again soon.

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Twin Cylinder .308

Author Topic: Twin Cylinder .308 (Read 6673 times))