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PCP, C02, and Helium Powered Airguns / Re: WARP COBRA is here!
« Last post by Dairyboy on November 20, 2017, 09:19:42 PM »
So I had time to take the .30 out yesterday. Took it hunting but no luck as I guess it was too early for most animals to be out and about lol. Anyways while there I decided to set up some targets at 75yds (ended up being 77yds lasered) and 100yds and a can of soda at 125yds. As you can see I didn't really have the best rest or setup lol my feet were on top of the tool box while prone.

Details on the gun are WARP COBRA .30 tuned at 820fps with JSB 44.75gr. Scope is SWFA SS 10x42 Mil-quad with Medium SWFA rings and a SWFA bubble level. Sighted in at 55yds. At 75yds I had a 1.5 Mildot holdover and 100yds was 4 Mildots. UTG 360 Recon bipod and a rubber butt pad and cheek riser on the stock. Gun likes a firm hold. I only have about 60 shots through it (in .30) which included these shots today and I'm shooting it this accurately! 39" long and 9lbs scoped! I'm more than impressed with this gun being a compact hunting rifle and being able to shoot it as accurate as I can. Also keep in mind I'm a hunter not a target shooter so this thrills me!

My setup being the bipod and a towel lol worked pretty good I must say



Close up of gun



The "shooting lane"



77yd target 5 shots just for a group and the 5 targets with one shot each once I got the rough holdover. I let my hold loose for the top right shot making the shot go off target. Learned that at 55yds that opened groups from nice and tight to 1.5"-2".



Group size at 77yds. First group shooting at this distance



100yd target. 2 shots for getting my holdover then 2, 5 shot groups.



My 2nd 5 shot groups at 100yds. 4 are within an inch.



1st 5 shot group at 100yds.



4 of them under .85"



Here's the can at 125yds. Took 2 shots to get the right hold over and GOT IT!

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PCP, C02, and Helium Powered Airguns / Re: WARP COBRA is here!
« Last post by Dairyboy on November 20, 2017, 09:19:29 PM »
Thanks Randy! I really love it I had changed it to .22 right away and shot it for awhile but recently put it back to .30. Really enjoy it in .30 and with the butt pad and cheek riser. I had the smaller bottle but I damaged it so I ended up putting a Talon Tunes bottle on it.
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This is a project I have been developing on the GTA for a while now.... Here is a rough drawing of the concept, which is to mount two empty 88 gr. CO2 cylinders under a QB78 main tube, reversed back towards the trigger group.... This will provide a nice wide base to the forearm for shooting off bags on a bench.... A pair of cylinders weigh 1 lb. 9 oz. and they each have an internal volume of 121 cc....



Well I finally got some shop time today, and I decided to work on the tank block to mount two 88gr. CO2 cylinders reversed under a QB78 main tube.... Using the previously posted drawing as a basis, I produced the following....



The upper hole is tapped 1/4" NPT for a threaded stub that will mount the block to the front of a QB78 main tube, retained using the original threaded CO2 cap.... You can see the two air passages crossing in the bottom of the hole.... They were drilled with a #21 drill (0.159"), which is the tap drill size for a 10-32 screw.... The total area of the two passages is equal to a 0.225" hole, so a similar size hole will be drilled through the 1/4" NPT stub to feed air into the QB78 tube.... Since that is larger than anything that would be used for the exhaust port, that means the entire 290+ cc's will be available to the valve....



There is an 11/32" hole drilled through in line with each 88 gr. cylinder, and that is tapped from the front 1/8" NPT for a gauge and a male Foster fill fitting.... The air passages will be plugged with low-profile 10-32 SHCSs, sealed with a #008 O-ring in the 5/16" recesses milled in the lower corners of the block.... At the moment the holes for the 88 gr. cylinders are only milled 1/2" diameter and 3/4" deep.... I will be centering each hole in a 4-jaw chuck in my lathe to machine the O-ring groove, and drill and tap the portion outboard of the O-ring to 16 mm x 1.5 mm to accept the cylinders....

The block weighs 5 oz., so the completed weight with the stub and the two cylinders should be just under 2 lbs.... The stock will have to be shortened a bit, so the total weight increase will be less than that.... I plan an operating pressure of 1800 psi maximum, in keeping with what CO2 can reach at 120*F, and because that is the MSWP of CO2 cylinders....

Bob
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PCP, C02, and Helium Powered Airguns / Re: 850 Hammerli
« Last post by sixshootertexan on November 20, 2017, 05:12:40 PM »
The valve o-ring is 8x2. I ordered it off ebay from a tackle shop in the UK. ebay user name a1tackleshop.  I don't think it is OEM but they worked. I contacted him and he made a special auction just for me. Still think it was just a 8x2 70D o-ring just a better quality one then I got at the autoparts.
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PCP, C02, and Helium Powered Airguns / Re: 850 Hammerli
« Last post by BillK on November 20, 2017, 06:52:30 AM »
What type, size ect. O ring did you use for the seal?
Thanks, Bill
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Norway rates are the big at about a pound, but Gambiam rats get upwards of 3 pounds! They're long in length, and sort of look like an overly-large vole. When you know these guys are around (you typically don't see them), you sure wonder what they're eating?
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Airgun Ammo / Re: .308 cal 106 gr. Airgun Bullet at NOE
« Last post by rsterne on November 19, 2017, 09:12:17 PM »
Spitzers are not necessarily much better for BC in the Subsonic range.... The point is very important when Supersonic where there is a shock wave surrounding the nose.... and you want the shape of the nose to be inside that shock wave.... Subsonic things work a lot differently....

Bob
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Airgun Ammo / Re: .308 cal 106 gr. Airgun Bullet at NOE
« Last post by YamahaR1 on November 19, 2017, 07:42:45 PM »
Just out of curiosity has anyone made a .308 round that's not a hollow point. But maybe a spitzer round, something that could be shot at great distance. I have a .308 flex that is a monster and will sling some HP rounds good.  Would like to try a different round that isn't HP of flat nose.
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That's some nice shooting. The ones in Richmond at my work are monsters, they look like they can carry off small dogs.
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Airgun Hunting / Re: Hello Micey My Old Friend
« Last post by YamahaR1 on November 19, 2017, 07:35:04 PM »
Nice shot, that rodent got the hammer!
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