First shots today!
The only OEM parts here are the breech, air tube and trigger...
My goal with this build is to shoot heavier slugs (50 + grains). I'd like to get them in the 900fps range for long distance shooting (no practical reason. I'm just having fun)
I took my first shots today. Below I'll post some 50 and 100 yard groups; so far the accuracy is promising, but I'll need to do more to get the power and efficiency to where I'd like. The 52grn boat-tails are running right at 800 FPS. Reg is set to 150 bar and I have drilled the transfer ports to .187. Using the stock hammer and spring, with my own free flight device the velocity stays the same no matter how much preload I put on the spring. I've got a hill airgun hammer that's a little lighter weight and I've purchased a TSS from a forum member which might give me a little more adjustment capability. The problem is in order to get the power I'm shooting for I think I'll need to open up the transfer port even further. I'm Using a Teflon tube (bought from Tim hill) that set up fits perfectly into the existing transfer port design and gives the largest diameter I can get given the amount of room available. Does anyone have tricks or advice on how to open up the marauder ports even further?
50 YDS
100 YDS
The only OEM parts here are the breech, air tube and trigger...
- 26" TJ Barrel 1/14 twist from mountain air customs
- carbon fiber shroud from Neil Clauge
- Donny FL Sumo
- Huma regulator (large plenum version)
- Cothran Valve
- Boyd's pro Varmint laminate stock
- Bushnell Forge 3 - 18 X 50 scope
- Huma replacement fill port with gage
My goal with this build is to shoot heavier slugs (50 + grains). I'd like to get them in the 900fps range for long distance shooting (no practical reason. I'm just having fun)
I took my first shots today. Below I'll post some 50 and 100 yard groups; so far the accuracy is promising, but I'll need to do more to get the power and efficiency to where I'd like. The 52grn boat-tails are running right at 800 FPS. Reg is set to 150 bar and I have drilled the transfer ports to .187. Using the stock hammer and spring, with my own free flight device the velocity stays the same no matter how much preload I put on the spring. I've got a hill airgun hammer that's a little lighter weight and I've purchased a TSS from a forum member which might give me a little more adjustment capability. The problem is in order to get the power I'm shooting for I think I'll need to open up the transfer port even further. I'm Using a Teflon tube (bought from Tim hill) that set up fits perfectly into the existing transfer port design and gives the largest diameter I can get given the amount of room available. Does anyone have tricks or advice on how to open up the marauder ports even further?
50 YDS
100 YDS