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A counterpoint: Larger caliber PCPs generally produce more power, and are thus harder to make quiet. If you are happy with the sound of a .35 moderator on your .35 PCP, the smaller calibers will be quiet enough, because they produce less power, despite the reduced efficiency. It will take a...

The Weihrauch moderator shown above is very effective at reducing sound, but it does not have an air stripper positioned just ahead of the barrel muzzle. This means that unless your airgun has an active shroud with its own air stripper, powerful PCPs may have groups open when the Weihrauch mod...

airlexx, Perhaps I misinterpreted the first link that came up after clicking on the one you provided. The "nl" got me thinking DF was in Holland- image below. South African links used to end in ".co.za" : Either way, I am impressed with what DF is doing.

So, airlexx, Delta-Force zit dus in Nederland, maar de producten worden gemaakt in Zuid-Afrika? Heel interessant. Ik ben ruim 60 jaar geleden geboren op 20 km van Centurion. Maar ik woon de helft van mijn leven in de VS.

Hold_Over How many more shots you can shoot after polishing depends on how rough the barrel was to begin with. If it was rough and fouled in 100 shots, a proper polishing job could extend that interval to 1000 shots. It also depends on the alloy of your projectile. If nearly pure lead, such...

woogie_man, Based on that twist spec, you could go heavier on your slugs, providing you can shoot them at useful velocities. Of course, it is actually length and the relationship between center of mass and center of air pressure that matters. There is also the matter of magazine depth that...

What is the difference in feel; when you load these slugs with the probe, open the breech and push the unfired slugs back out with a cleaning rod from the muzzle? How do the rifling witness marks compare? I state not to shoot slugs with a diameter over barrel groove diameter, but if the...

woogie_man, Do not shoot slugs larger in diameter than the barrel groove diameter. You increase the risk of distorting them on loading due to the extra loading force. The amount of blow-by is less than one might think, even with the projectile diameter 0.001" smaller than the barrel groove...

A lack of leverage, probably.

No worries. It sounds like your Crown should be a winner.

Well, the basic power foundation setting is the regulator pressure. Reduce that to reduce power, and optimize the hammer spring setting for consistency. Just how low do you want to go? 10 or 20 J? 16 J is 12 FPE, which is what the UK is restricted to. Even that may be a bit high for...

pcpSWE, 10 Joule is 7.5 FPE, which is HW30 spring piston air rifle territory. Close to ideal for short range indoor small bird pesting, especially with wadcutter pellets. If that seems too potent for your purposes, then choking the transfer port adjuster way down seems like the most effective...

Yes, but better than reshooting pellets of any kind. I was replying to @Snap-Shot.

Shooting used pellets out of springers gets them stuck in the barrel. Resizing the pellets loses the engineered interference between pellet skirt and the breech cone of a springer. This then acts almost like dry firing it due to the loss of initial pellet motion resistance on firing. PCPs...

Shorter barrels of a given diameter are a lot stiffer than longer barrels. They flex less from the admittedly limited shock produced in air rifles, compared to PBs; and so short barrels suffer less from "harmonics". Now, it might help to define the length of a "short" barrel, as well as a...