diablo66 said:
I never claim to be an expert just merely someone who has struggled through the cocker learning curve
Sorry if my post came off harshly, it wasn't meant to sound as blunt as it came off.
If your cocker is using a lot of air, might need a tuning of springs/board settings. Properly setup, they shouldn't use much more air than your average popit style, ram-operated marker (I don't own an ion, or any other balanced spool valve marker, so I couldn't offer any comparison of average number of shots per fill).
As far as the front reg: like I said, any increase in shot-to-shot consistency, in regards to velocity, shouldn't have anything to do with that. Think about the gas path and the function of the reg, the LPR is simply used to regulate gas from the main gallery to a lower pressure, and from there it gets moved from one side of the ram to the other to operate the back block/bolt assembly. Aside from using more or less gas, depending on being correctly set or not, it shouldn't have any bearing on consistency. Your main reg would be responsible for that, as it supplies and replentishes the gas gallery that gets released when the valve opens, and if it doesn't supply the same amount quickly enough every time, you lose shot-to-shot consistency.
Speaking of which, if the air in your tank drops below the output the tank is set for, it should just bleed out the remaining air at whatever pressure is left in the tank. So if you've got 700 psi left in a 850 psi preset, it'll just piss whatever it has left at whatever pressure it has left, which will lead to drop-off. The reason you see different performance on different markers is down to the reg on the marker: as the output pressure of your tank (which serves as the input pressure to your marker's reg) drops, your reg begins to starve, and certain regs do it more quickly (at higher pressures) than others. The solution to this problem is to keep your tank full. And if that's not doing it, get a bigger tank in conjunction with keeping your tank full