No this will not work, that was my plan for the 25.4/18.1 also. You pair the tune with a lighter slug(22gr hybrid)for a dual tune. If you move the PW down enough to shoot the 18.1 slow enough the reg/hammer balance will be off and cause big ES/SD numbers.
If you are experiencing a POI shift make sure the entire barrel assembly is snug, from the transfer port out. Been there done that. I'm set up on both my .22 and .25 Mavericks to just dial, sometimes you wind up with perfection all the way others the SD will be a bit larger but meh whatever.
Really? I can shoot 22g. slugs, all the way down to 14gr, no issues, the SD may not be super tight but it's in the close enough range. It's fun to shoot the really light pellets close to 1,000 and still have nice tight groups at 30 yards....and still be able to dial it up for slugs at 100 yards.
25.4 to 18.1 is a big stretch and you are the one that helped me focus on one pellet and pair it with a slug(thank you again). The MRD can be shot faster and causes even more of difference. I suppose if you shot the MRD “slow” then it might kinda work. Maybe if you flip the barrel from slug port to pellet when shooting the 18.1 it could work.
Pellet port…but I cheat a little with a slug probe, NOT a pin probe. Reasoning . Why have two small holes for the air to go through? I'm running 126.1 bar on the rear. It MAY have a .25 cal hammer weight in it because it was a .25 Sniper at one time, the .22 cal compact. Also be aware that I've tuned my Bellville washers so they are all the same. My SD in this gun isn't as quite good as my .25 and that may be the reason but it's close enough that I don't care. On #7 I'm still getting 60+ shots, don't ask the size of the bottle I've forgotten let's just say mid length, one size up from the compact. With 25.4 gr I'm getting 860 fps and 42.2FT Lbs with a SD of 7.6fps and a full spread of 26FPS. 22 gr slugs, 892 FPS, 19FPS spread and 7.5 FPS STD, 18.13 985 fps, 11 fps spread and 4.0 SD and the fun one....Crossman on HSA 4 14.3, 909fps, 98 fps spread, 34.6 SD but they absolutely drill, it's cheap thrills.
Yes, I did go thru last week and found that the barrel was loose at the transfer port. I did a small amount of blue loc tite to keep that from happening again. Went out and found the groups seemed to be doing really well as far as being tight and no POI moving about. Today seems like that has started happening a bit again, not much but enough that it is noticeable. Groups are always tight but just moving about....is this a sign that I'm still not dialed in and due to the wheel?
I have the slug side down so more air goes in.
To your last statement YES, nice job!! Not everything needs to be on any given number, you can start fiddling with the HSA to get speeds that work for the pellets, the SD may open up but I've found generally not significantly unless you're doing something like I do with extreme weight differences. You will probably find that the 22gr slugs will work in the 5 to 7 range. I'm doing 18.13 on HSA 7 at 985 SD of 4.0. My 25.4gr are at 860fps with a SD of 7.6. It's probably that heavier hammer weight. I really don't care because I can hit a cork at 100 yards
Sounds like a good plan and exactly what I'm waiting on now. Have suspended all tuning until those 25.4s come in, hopefully today. Will take a look at the video. Thanks for posting.
I agree with you totally. However, the impact, in my experience, will tune with a good ES much wider than the Maverick will. On the Maverick I tune to one projectile.
Thanks for your perspective on this. Pretty much where I'm headed also with the 25.4. You posted a nice read on another post about tuning with regards to adjusting the hammer spring. I copied and printed to keep for reference
. I have the Maverick compact in 25. I just shoot 25.39 and hades out of it. With a 102 bar operating reg pressure it shoots the 25.39 a bit over 900 fps very well. I have an m3 600mm tuned for 33.95 heavies. That gun however will shoot 25.39 with very consistent velocities around 900 by just dialing the power wheel back to 4 from 13. I can do that on my Maverick however it’s extreme spread opens up much more when you venture off the optimum tune than the m3 does for some reason.Thanks for your perspective on this. Pretty much where I'm headed also with the 25.4. You posted a nice read on another post about tuning with regards to adjusting the hammer spring. I copied and printed to keep for reference
What all do you shoot?
That video you sent was FANTASTIC! I finally understand now what tuning to the "knee" is as well. I've read the instructions for doing this and heard it spoken but by him putting it into a graph really helped to drive it home, thanks for sharing that.
and for those of you that fear light pellets at long distance, I consistently hit steel 2”spinners at 100yrds, and got at least 60 shots out of that little tube, loved that thing!
