I appreciate all of the info. I would like to stick with the 12 gram co2 because I am going to get a .25 marauder soon. What I want to do is have a nice short gun for pest control that wont stick way out of the window for everyone to see. I also was hoping to get enough power to take head shots on racoons if I need to. I guess if it dont work I will make a shooting stick so I dont have to put a longer gun out the window.
Quote from: joklak on June 26, 2013, 02:18:44 PMI appreciate all of the info. I would like to stick with the 12 gram co2 because I am going to get a .25 marauder soon. What I want to do is have a nice short gun for pest control that wont stick way out of the window for everyone to see. I also was hoping to get enough power to take head shots on racoons if I need to. I guess if it dont work I will make a shooting stick so I dont have to put a longer gun out the window.A .25 Marauder would be preferable for head shots on coons. You might be able to get the power of a 2240 up to where it would take a coon OK with the headshot, but it's going to take a lot more finesse on the part of the shooter. If you can get up close then the pistol is fine and is more easily slipped under a jacket or other garment to prevent inquisitive eyes from seeing the tool. If you're shooting out of a window there's a lot to be said for doing so with a long gun with a scope from back inside the room somewhere. Plus, the Marauder will be much quieter than the 2240, especially if you pull away from the window - that way what sound IS emitted will be further dispersed prior to leaving the confines of the room you're shooting from.
I am in the process of making the 2240 a carbine so the barrel wont stick out to far and I have a tko muzzle brake which really helps a lot. In a way I guess I just needed a project.
cwlongshot.... My work on the .22 Disco was all done and documented before I joined the GTA, so I have nothing I can link you to.... Basically, I bored out the valve, enlarged and streamlined the ports, opened up the inlet and the gauge block so more air could get into the valve, ran a slightly heavier hammer spring, shortened the valve stem a bit to increase hammer travel, slimmed the stem and drilled out the throat to increase the throat area, etc,etc,etc.... and installed stronger valve screws.... I got 53 FPE peak with EunJins, 10 shots strings averaging 51 FPE from 2500 psi down to 1500.... I ended up detuning the gun to 36 FPE and using 18 gr. JSB Heavies as they were the most accurate at about 950 fps, and better than any other pellet for accuracy at long range.... Power is fun, but accuracy is where it's at.... I run all my .22 cal PCPs at around 36 FPE....Bob
I have one question. Where and how did you learn all that? It's all Greek to me, but i would love to learn. I also imagine you have to have some decent shop tools. So far I can change barrels, play around with triggers, and mount scopes. Pretty basic stuff but I would like to go deeper. Any suggestions?
P.S. for rsterne:- In a prior post I attached a graph from an 2013 post of yours indicating max potential 22 fpe with unconstrained CO2 .22 with 0.154 inch diameter transfer port. Looking at the graph for .30 caliber, the max fpe with that same size port was about 35 fpe with a 0.154 transfer port or about 45 fpe with a 0.21 transfer port (i.e., roughly 70% of caliber/barrel diameter). Your quoted 25 fpe suggests your experience is well below that max. Maybe due to the relatively short barrel length?
Potential FPE = Force x 1 Foot