Hi,new to air guns so i have a lot to learn,I have a 2240XL I see a lot of people use 14 gr pellets if I use the lighter pellets a ten shot target looks like a shotgun pattern this is at 25 yards, but I switched to 17.75 gr and it does a lot better groups.Is it me or does this gun just like the heavy pellets. It's stock maybe 100 shots threw it.
I feel like I'm having exactly the opposite result. I have probably 4-500 shots through mine, though it's the standard 2240, not the XL, and all of that has been off hand. Feel like I need a decent rest before I get too judgy on the pellets. Most of my shooting has been with Crosman premier hollow points, the 14.3 gr. Dirt cheap and readily available always score points with me. :P I also picked up a variety pack of JSB diabolos that has four diff weights- a 13.5 (or 8? I forget..) a 15.5-ish, 18.something, and some big ol' 25 gr honkies. Pistol seemed to really like the 13's and pretty consistently sent the fatties high/right. There is noticeably more recoil with the heavy pellets so *maybe* that had an effect... dunno yet. Also, all of my shooting has been in the 5-15yd range.
At any rate, trying new ammo is fun and I wish more variety packs like that were available. There are some but few and far between.
As you said jsb pellets have been recommended to me by others so I'm going to order the sample pack and see.
Here are my results with a modified 2240. I too got good results with pellets around 16 grains. But weight was not the only determinant. Results vary by pellet type/shape as well as weight.
(Sorry for the poor formatting of the copy/paste of my spreadsheet table)
Crosman 2240 speed, accuracy, and sound levels
Steel breech (purchased Crosman 2240XL)
18" barrel from Alliance Hobby
Boss Max valve, stiffer hammer spring, and hollow bolt probe from Alchemy AirWerks, 3.9mm transfer port from Alliance Hobby; uses about 1 gram CO2 per shot
Bulk CO2 set-up: fed from 250 gram / 9 ounce cylinder; powerlet eliminator from Alliance Hobby
Falx moderator from Silent Thunder
Crosman 1399 stock
Speed measured with Competition Electronics ProChrono DLX
Accuracy is max center-to-center distance of 3 shots, from 30 feet, inches
Session 2: Simple Caldwell stand; 75 degrees; 60% humidity; overcast; at least 20 seconds between shots
Barrel length Valve Moderator Hammer spring Pellets Grain FPS 5-shot accuracy, 10 yards (CTC, inches) Comments
18 Boss Max Falx Boss Max Gamo Red Fire 15.4 560 0.20 Loading alignment helped by seeing red tip
18 Boss Max TKO Boss Max AA Field 16 16 590 0.23 584 FPS with AV 1100 psi air tank
18 Boss Max Falx Boss Max Skenco Newboy Heavy Weight 26.2 478 0.28 Oxidized; difficult to close bolt
18 Boss Max Falx Boss Max Predator Polymag 16 556 0.28 Loading alignment helped by seeing red tip
18 Boss Max TKO Boss Max H&N FT Trophy Green 9.56 695 0.31
18 Boss Max Falx Boss Max JSB Match Exact - Ultra Shock Heavy 25.39 474 0.31
18 Boss Max Falx Boss Max JSB Match Exact - Jumbo Monster 25.39 469 0.31 Easy to load
18 Boss Max Falx Boss Max H&N Terminator 16.36 559 0.31 Very firm bolt fit
18 Boss Max Falx Boss Max H&N Baracuda Hunter 18.21 538 0.35 Large hollow in tip
18 Boss Max Falx Boss Max JSB Match Exact - Beast 34 428 0.43 2 out of 7 would not allow bolt closure
18 Boss Max TKO Boss Max JSB Monster 25.39 494 0.5 484 FPS with AV 1100 psi air tank
18 Boss Max Falx Boss Max JSB Match Exact - Jumbo 15.89 558 0.55 Easy to load
18 Boss Max Falx Boss Max H&N Field Target Trophy Green 9.56 675 0.55
18 Boss Max Falx Boss Max Crosman Premier dome 14.3 591 0.63
18 Boss Max Falx Boss Max JSB Match Hades 15.89 567 0.75
18 Boss Max Falx Boss Max Crosman Premier hollow point 14.3 572 0.83 But 30 shot string was within 24 cm = 0.9 inch
18 Boss Max Falx Boss Max FX Hybrid Slugs 22 495 1.06 Very easy to load
18 Boss Max Falx Boss Max H&N Baracuda Hunter Extreme 18.52 Not tested
Quote from: RScott on September 02, 2021, 05:08:55 PM
Here are my results with a modified 2240.
The data look like a lot of fun - I reconstructed the table in Excel so I could examine it. Have you considered repeat testing at 20 yards to see how they fall out? Piques my curiosity, especially the tight group with the gamo pellets - never would have thought they'd be that accurate. Thanks for sharing!