Any one think these will work in the Cricket?

"DEN54"
"BayStYat"



no.
It's too much weight 49gr. Cricket has no power for this bullet.
Tuning it is not realistic. ​Cricket for 25-30gr.
Incorrect: Your statement might be right for a .22 but the OP said .25. My Cricket is "tuned" for 35 grain. It still has a lot more power available as the hammer spring is not even in 1 turn in from factory! The regulator can also be adjusted for more power. This is a very capable gun in the hands of an expert tuner like Earnest! ;)

I will say that the bullet linked is too long for the Cricket Magazine so they would have to be hand loaded. (Mag is 10mm MAX, Bullet is about 12mm)
Bobs Boat Tail bullets (molds from NOE) in 41 Grain are the heaviest bullet that will fit the magazine. His 52 Grain Flat nose are just a touch too long and might cause indexing problems.

Thurmond
 
For those considering slugs. Just know that most air gun barrels are choked in order to shoot pellets properly. To shoot slugs accurately you need to match the slugs to the barrels in size, twist rate and velocity. This is where the weight of the slugs come in. It takes a lot of experimentation to find a great shooting slug for bigger bores and even more to find one to shoot great in a small bore choked barrel. PA just did a video about shooting slugs in small bore PCPs and they just touched the surface. I would suggest contacting Nielson Ammo because he will size slugs to match the gun

 
"T3PRanch"
"DEN54"
"BayStYat"



no.
It's too much weight 49gr. Cricket has no power for this bullet.
Tuning it is not realistic. ​Cricket for 25-30gr.
Incorrect: Your statement might be right for a .22 but the OP said .25. My Cricket is "tuned" for 35 grain. It still has a lot more power available as the hammer spring is not even in 1 turn in from factory! The regulator can also be adjusted for more power. This is a very capable gun in the hands of an expert tuner like Earnest! ;)

I will say that the bullet linked is too long for the Cricket Magazine so they would have to be hand loaded. (Mag is 10mm MAX, Bullet is about 12mm)
Bobs Boat Tail bullets (molds from NOE) in 41 Grain are the heaviest bullet that will fit the magazine. His 52 Grain Flat nose are just a touch too long and might cause indexing problems.

Thurmond
Be careful of one, you can break the draft of the cocking. There have been cases . In Russia there are several.
Also for these bullets you need a barrel without a choke. Only in this case they will fly to the target.
The rifle body does not provide for the installation of good large hammer springs.
 
"DEN54"
Be careful of one, you can break the draft of the cocking. There have been cases . In Russia there are several.
Also for these bullets you need a barrel without a choke. Only in this case they will fly to the target.
The rifle body does not provide for the installation of good large hammer springs.
Those are valid concerns. The 1st concern can be eliminated by proper sizing of the slug and using nothing but pure lead plus a proper lead in for the breech end of the barrel. 
The choke issue can also be solved in one of two ways. Proper slugging of the barrel followed by proper sizing of the projectiles.
The other method is to cut the choke off (typically a half inch or less in length) and re-crown the barrel (of course this would require some rework of the shroud as well).
The hammer spring would be the limiting factor here but Earnest (sniperlabyo) can do magic with these guns.

Thurmond
 
All Sumatras have unchoked barrels from the factory. As I said before, I've tried several slugs and have not found any that out performs pellets. When I cast bullets there were several mold options to choose from for 35 cal and up but not many 25 cal options so i never cast 25 cal slugs. LW sells unchoked barrels that can be machined for any gun. I think you can get various twist rates and polygon grooves. The barrels cost around $130-150 but the machine work will probably double the total cost. My Sumatra shoots the 43 gr Eugin pellets pretty good so if I need 90 FPE in 25 cal I can shoot them. My 30 cal Hercules get 30 shots at over 100 FPE so if I need more power than I get with 25 cal pellets I can use that gun.