Presenting what I've been working on for some months now - Copperhead. My modified .30 Vulcan2 Tactic that I bought used here on AGN. I got it last year after EBR when looking for a gun to shoot in RMAC PMC and Speed Challenges. I shot the .22 Cricket mini Carbine last year and it was no bueno with the wind. So I wanted an accurate .30 caliber gun that would be good for Speed and Precision Rifle Challenges. So this one came up and I bought it, knowing that AGT guns are usually very accurate (I have a .25 Vulcan Tactic Gen4). The gun was fairly accurate but needed some work. Plus I was only getting two (9 shot) magazines per 250 bar fill...
The goal: tune for maximum accuracy and efficiency so that at least 3 magazines per fill are available, and shoot MOA or better at 100Y.. Cleaned, scrubbed with brass brush and then JB Bore pasted the barrel. Opened up valve house transfer port. Tightened up valve spring for efficiency and better SD. Added Ernest Rowe Power Plenum for Cricket. This required some minor machining that my friend John Hagan did for me. Thanks John! I also added a Huma regulator (set at 140 bar) because the plenum is larger than stock (the stock reg. was perfectly fine). I tuned the gun for 865 FPS with the 44.75 JSB (it HATED the 50.1) and ended up with 32 to 33 shots per 250 bar fill after much time tweaking various parameters. FYI, this is an equivalent efficiency to the new Impact Mk2 with power plenum. Goal exceeded.
FPE/cuin per shot = increased from 0.95 to 1.52 (higher is better),
Bar-cc/FPE per shot = improved from 17.3 to 10.8 (lower is better),
Approx. 60 to 62% increase in efficiency. Avg. FPE = 74.4
Valve house (modified & polished) and Power Plenum
Assembled into pressure tube for testing - prior to polishing the port obviously...
Tuning...
The results: great efficiency and looks mean nothing if the gun isn't accurate. So I finally got the gun out for some accuracy testing today. I shot it last weekend ground squirrel hunting and it did well, taking seven from 35 to 70 yards, no misses. But this went out much farther than that... Scope is an Athlon Ares BTR 2.5-15x50 Mil/Mil.
Took two shots (lower two) to sight in, then five more into the same hole at 50 yards. Enough of that easy chip shot stuff...
Moved to 96 yards. Shot two 9 shot magazine groups. The wind was 12 mph shifting from my 10:30 to my 1:30 frequently... So there are two very tight six shot groups and then three when the wind shifted. I did not change my POA for these nine shot groups... EBR target, 9 ring is 1.25 inches. I'd say that's about as accurate as any other high performance gun out there, so I'm satisfied... Both six shot groups MOA or better. Goal met.
So, despite the shifting winds, cool and cloudy day, I decided to shoot a group at 110 yards. By this time the wind has picked up to around 15 mph gusting to 20+... Six shots total, was going well till the gusts got the last two shots. But what can you do? I didn't have all day, and I was satisfied with the 96 yard groups...
Here's the gun when i shot it last year... Before all the mods...
Go Team Centercut - five of us will be at RMAC 2020.
The goal: tune for maximum accuracy and efficiency so that at least 3 magazines per fill are available, and shoot MOA or better at 100Y.. Cleaned, scrubbed with brass brush and then JB Bore pasted the barrel. Opened up valve house transfer port. Tightened up valve spring for efficiency and better SD. Added Ernest Rowe Power Plenum for Cricket. This required some minor machining that my friend John Hagan did for me. Thanks John! I also added a Huma regulator (set at 140 bar) because the plenum is larger than stock (the stock reg. was perfectly fine). I tuned the gun for 865 FPS with the 44.75 JSB (it HATED the 50.1) and ended up with 32 to 33 shots per 250 bar fill after much time tweaking various parameters. FYI, this is an equivalent efficiency to the new Impact Mk2 with power plenum. Goal exceeded.
FPE/cuin per shot = increased from 0.95 to 1.52 (higher is better),
Bar-cc/FPE per shot = improved from 17.3 to 10.8 (lower is better),
Approx. 60 to 62% increase in efficiency. Avg. FPE = 74.4
Valve house (modified & polished) and Power Plenum
Assembled into pressure tube for testing - prior to polishing the port obviously...
Tuning...
The results: great efficiency and looks mean nothing if the gun isn't accurate. So I finally got the gun out for some accuracy testing today. I shot it last weekend ground squirrel hunting and it did well, taking seven from 35 to 70 yards, no misses. But this went out much farther than that... Scope is an Athlon Ares BTR 2.5-15x50 Mil/Mil.
Took two shots (lower two) to sight in, then five more into the same hole at 50 yards. Enough of that easy chip shot stuff...
Moved to 96 yards. Shot two 9 shot magazine groups. The wind was 12 mph shifting from my 10:30 to my 1:30 frequently... So there are two very tight six shot groups and then three when the wind shifted. I did not change my POA for these nine shot groups... EBR target, 9 ring is 1.25 inches. I'd say that's about as accurate as any other high performance gun out there, so I'm satisfied... Both six shot groups MOA or better. Goal met.
So, despite the shifting winds, cool and cloudy day, I decided to shoot a group at 110 yards. By this time the wind has picked up to around 15 mph gusting to 20+... Six shots total, was going well till the gusts got the last two shots. But what can you do? I didn't have all day, and I was satisfied with the 96 yard groups...
Here's the gun when i shot it last year... Before all the mods...
Go Team Centercut - five of us will be at RMAC 2020.
