2240 Power Adjuster - Set Up and Usage?
I have been investigating Power Adjusters for the 2240 and I wound up purchasing one which is on the way. 😀
My questions are fairly straight forward: without a chronograph, have any of you folks found a way to:
a) set up presets in an efficient way?
b) record those presets so you can rapidly and accurately change from one to another on the fly?
My goal is quite simple: establish two presets, one for target practice, and one for pest control. That would be 50 shots/cart and 25 shots/cart respectively. Once presets are established, I want to be able to rapidly change from one to the other without a lot of futzing or trial and error.
If any of you have played around with 2240 power adjuster mods, I'd appreciate any insights you might offer.
the main thing is not all adjusters are the same so that make my info different then someone else's
you first have to do some measuring, how deep the factory rear cover pushes the spring in and then see how that matches the new adjuster
and to see at what point you can't cock the pistol because of spring bind
sometimes these adjusters come with a new spring, which just scrambles the numbers
so it will be trial and error, and counting the turns, which also mean the knob will need to be marked
Also don't be surprised if sighting (both elevation and windage) requires rezeroing whenever the power setting is changed.
Oh, that part, I fully expect. I have all such "changes" dialed in and recorded so I change my set up, with a few clicks on the dot sight and I'm good to go. Right now, I have catalogued the obvious dot sight settings for stuff like a barrel swap out. But also, some ammo requires re-zeroing, so I have those changes recorded as well. I expect that will be the case for maximizing power on rounds of varying grains.
The problem I'm anticipating with the power adjuster is that there is no detent, no way to count clicks. But Marflow said what I was kind of thinking : do the research, count turns, and mark the knobs.
The manufacturer said to count shots and record turns. That could add up to a lot of pellets to hit the desired sweet spots... I may well just get close enough and call it good. The manufacturer also said, the only way to be 100% sure of the power settings is to dial it in using a chronograph, but even then, you are counting turns, and marking the knobs ... but with more consistent power settigns! 😀
I own one and it shoots nearer the advertised velocity than any gun I know of. It is advertised at 460FPS and I have chronied mine at 455FPS using a Crosman 14.3 pellet. I haven't modded or adjusted it in any way. I don't know if you will get more velocity without wasting CO2 using the standard length barrel. If you use a longer barrel with the adjuster you probably will get more velocity. You just have to remember higher velocity means more gas per shot is used. These are great little guns, very accurate, and fun to shoot.
Well, my 2240 is now highly modified: power adjuster, enlarged transfer port, long nose bolt, 14.6" barrel, shoulder stock, LDC, and a Hawke dot sight on the long steel breech. I have named it the "Madd Ratter" because that machine firing H&N Hornets blows big holes in the creek rats that raid my wife's bird feeders. I'll post pics (of the machine) sooner or later.
My quest was/is to find a way to rapidly change between max power (25 shots/cart) and target practice mode (50 shots/cart) WITHOUT a chronograph and trial and error each time I want to change. After playing around with some ideas, my plan is to adjust the threaded rod for 25 shots/cart then place heat shrink tubing as a stop. That way, I crank the rod up to the stop, and viola, max power @ 25 shots/cart.
The unsolved problem is marking the target practice setting. It could be as simple as marking with a Sharpie, but with some thought I'm sure there is a better solution. Nail polish? Teflon pipe thread tape? Saw a small notch on the rod? I'll play around with thought experiments then try something tangible. We'll see.
One approach I've used is to trim the hammer spring one coil at a time until you can max out your pa adjustment w/o coil bind.
Then you know that's the max power you're gonna achieve, so you make a mark on the pa at 12 o'clock. Now you just back off the pa
when you want more shots w/less power.
Also, if you ever come across an old Crosman SSP 250, the high/low power end plug/striker combo will work like a charm on a 2240.
But this does require a Crosman steel breech (or aftermarket) with the old, forward screw location.
Thank you all for your comments and contributions! Some follow up is justified.
I did play with various methods to mark the threaded shaft for rapid conversion from high-power/low-shot-count to low-power/high-shot-count.
In the end, I bought a chronograph, measured FPS, and counted rotations of the threaded rod. 😀 All testing was done at 82F ambient.
High power: Slam dunk easy. At 3 turns out from total spring bind, I was getting 697 FPS avg with 11.75 gr Predator GTOs. And 599 FPS avg using 16gr H&N Hornets - that's >12 FPE ... a .22 Hornet ... at >12 FPE ... Me likes! Shot count was the same for both pellet types at about 20 rock solid shots, with very rapid drop off for shots 21-25. Shot #28 (GTOs) did not leave the barrel ... 🤨
Low power: 16 turns out (marked with a Sharpie). Using Predator 11.75gr GTOs, the dependable yield is 80 shots for the cartridge, ranging from ~650 FPS max, stabilizing at about 450 FPS for many shots, and ultimately dropping to below 400 FPS right around 80 shots (double factory settings). Good enough. And hey, I'm helping global warming by reducing CO2 emissions!!! 😀
Accuracy: I dialed-in my recorded dot sight presets for the GTOs and Hornets accordingly - G2G - no adjustments needed irrelevant of high versus low power modes. In theory there might/should have been changes in trajectory, but that did not manifest at my normal shooting distance of 10m.
After thoughts: Calibrating with CO2 is a royal PITA. The main issue is a nonlinear power curve that is further affected by firing rate and ambient temps. This reality made the chronograph a necessity. I was shocked by how many cartridges and pellets I burned through, but in the end, I got it right. The results of this project have redefined the performance limits of my 2240. And I have a new flexible machine that delivers consistent results from two radically different power modes.
The rats are deader than ever, and practice sessions require literally 1/2 the cartridges. To quote John Lennon, "Happiness is a warm [CO2] gun." Go in peace folks!