Excellent Cll

This is the Excellent Cll .21 roundball. It difference from the Cll K is the loading port. It is also newer than my Cll K .177 and .21. Being made in the late fifties. 
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Professor,

Looks like they went to a simpler, less expensive loading port in later years. Looking at the pictures, one reason for the heavy-spring pressure thumb button seems to be to hold the loading port tightly to the breech. Effective, as demonstrated by accuracy, but hard on the thumb. Curious to know how snugly roundball ammo fits in breech now that you can load directly. Thanks for interesting post.

WM
 
Professor,

Looks like they went to a simpler, less expensive loading port in later years. Looking at the pictures, one reason for the heavy-spring pressure thumb button seems to be to hold the loading port tightly to the breech. Effective, as demonstrated by accuracy, but hard on the thumb. Curious to know how snugly roundball ammo fits in breech now that you can load directly. Thanks for interesting post.

WM

Their first pumper had this breach. The rolling one came later on the Cll K. The one with this block was able to shoot pellets also. I have shot the .21 ball and some .20 pellets which I expand the base so they fit.

They made both proprietary .21 ammo both roundball and pellets. I was able to find 1500 .21 roundball. The .21 pellets are non existent or vary very rare.

The roundball fits snug in the barrel. Probably kept this deign for the duel ammo. And so they could have more models. The Cll K was called a Carbine. 
 
Professor,

My first thought seeing this loading port was, "Why not just load a pellet in the breech, instead of roundball?" Then I remembered, "Oh yeah, never heard of a .21 pellet." "Non-existent or very, very rare," for .21 pellets is probably accurate, but sure would be cool to find some. Snug fit on the roundball loading would have been my guess, too. This is the second vintage gun reviewed recently with proprietary ammo, no longer available. I can't recall any modern airguns having proprietary ammo, except for maybe those big bore, one-of-a-kind monsters.

WM
 
Quackenbush had odd sizes. I don't know what caliber the Quackenbush Gems are. Some of the push barrel Quackenbushes were .21.

You can make a sizing die to reduce .22 pellets to .21. I had a push barrel Quackenbush at one time but I sold it off. No longer it's caretaker. I used to roll .22 pellets across my workbench under a board to size a few to shoot it into a soft target and then gather them up to use them over. It wasn't very powerful. A parlor gun.