2240 and Monsters, a better alternative?

When I first started this 2240 addiction, I was told by several people to stay away from the heavier weight pellets in the 2240. And sure enough, the 14.3’s do seem to reach higher velocity. I now achieve, in my self modded 2240, CO2 powerlet powered, 610 FPS with CPLHP’s. This seems to be a fine killer on California ground squirrels.
I have done the following work by myself on my 2240: the valve opened up by cutting back on the cap threads, the cap drilled out on the inside and recontoured to get more volume and the valve rod thinned for better airflow and the pierceing pin slabsided. I then opened up/recontoured and polished the valve porthole, put in a poly conversion and opened up the barrel gas port, on the barrel which is 14 inches, and installed a Millet redot. I replaced the trigger spring, polished all the bearing surfaces and the hammer has been polished. It has a stock adapter/power adjuster and is using the stock hammer and valve springs.
It also wears a really slick Anthony R metal breech and bolt and aluminum barrel band.
Somewhere on this gun are a few original parts. 😕
I tried replacing the hammer spring with a heavier one and a lighter valve spring, this always resulted in a powerlet getting stuck in the tube, this means a tear down or drilling the end of the dead powerlet and putting a metal screw in the hole to pull it out. Original springs seem to give me the same power without this pain in the ass and the trigger pull is much lighter.
Then I read on the Yellow about a DAQ 25 caliber pistol carbine for sale, quality guns for sure, so I always read the adds on the DAQ.
It was advertised as getting 508 FPS with 20 grain pellets, wow, I thought 💡 , I can do that with my 2240 with a heavier bullet with a better sectional density I think.
So I gathered all my equipment this morning and a tin of 25.4 grain Exact Monsters.
It was cool here, so I wrapped the gun in a 75 F wrap to keep it warm. I set up a target at 25 yards, and shot off of my Caldwell bag.
I got 497 to 501 fps for 12 shots. Five shots went into .53 inches with the red dot. I had to readjust the POI from the 14.3’s which I also shot this morning. They were going 610 FPS and shot about an inch group.
Charigun says that I get better penetration, almost 4 inches and 14 fp of energy as opposed to not quite 2 3/4 inches and almost 12 fp of energy.
I use this gun as a handy car gun and anytime I do not wish to have a rifle, not really for plinking, I have another 2240 for that.
If I wanted to get into the higher energy levels I have to go with the PCP option, which I don’t really want to, I have three AF rilfes for that.
But what this will do, is penetrate a heavier skull, or deeper into the vital area of the medium predators like coyote or raccoon, or a nutria if need be, and it seems to shoot better.
What am I missing here? 😎
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Oh okay, thanks for clearing it up for me. I guess I assumed “.25” when I heard “monster”. I get these pellets confused at times. The .25’s are called “kings” 😳
I actually have some of those monsters laying around somewhere. I think I will give em a try.