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ChrisT, If you make the muzzle face completely flat, then you do not need to indicated off the bore. Besides, how do you insert a close fitting gauge pin into the bore, in order to indicate the barrel ID, until you have a burr-free crown to begin with? Perhaps cutting anything but a flat...

Some crowns shoot well for a small number of shots, before they deteriorate. Other than a burr at the "exit", crowning tools pilots can scar the tops of the lands, perhaps an inch into the barrel. Such circular scratches may scrape the projectile and accumulate lead, so that accuracy degrades...

Ugly crowns often shoot better than expected. However, some defects always lead to grouping trouble, such a a heavy burr that build up an uneven speed bump of lead at the muzzle. So, ugly and dysfunctional are not synonyms. That said, driving with soft tires does not always cause immediate...

This is for the OP, as clarification of Firewalker's statement: Expect to use more than one facing cut on the lathe. The number of cuts required depends on the smoothness and perpendicularity of the saw cut. The idea is to keep going until the saw cut is completely cleaned up. The light cuts...

Airgun moderators do not (should not) make contact with the projectile, so the projectile speed is not reduced by the moderator. If you heard that moderators reduce the speed of the projectile, that idea may have come from fire arms, mounted to moderators that use rubber "wipes". These wipes...

Crosman pellets are made of a lead alloy with a higher antimony content. This hardens the pellets to reduce shipping damage, and probably makes them penetrate targets better. But, high antimony lead smears off and builds up in airgun barrels; and is very hard to remove. Often requiring a...

"Clean" is not the absence of lead flakes. It is the absence of negative affects on target. It is normal for a completely clean barrel to shoot to a different POI until 10 shots have gone through it to "season" it. Meaning lay down a stable coating of lead - so not completely clean. Hence...

Not exactly what we would like to see, but perhaps useful? https://www.pyramydair.com/product/jsb-match-premium-light-177-cal-7-33-grains-wadcutter-200ct?p=1334&page=2&query=match&lang=en&searchConfigId=643645070c547549270ccc15 JSB Match S100: JSB Match Air Pistol...

@Nvreloader has a database of pellet head and skirt diameters that he measured. Perhaps he would be willing to share those here. Or at least a subset, for the JSB and AA pellets mentioned above?

It is all about expansion volume as a ratio to case volume (powder capacity). So, shorter for larger calibers using a given case capacity; and longer for smaller calibers with a given case capacity. For PCPs, "case capacity" translates to plenum capacity, reg pressure, and valve area, lift and...

I will take your STO remark as a compliment; but he is not me. You can see my design experimentation and progression on the GTA forum; specifically in the thread with the title Taming the bark of an Avenger. Those designs are very different from what STO uses, even though some of my latest...

mtnGhost, PB moderators handle a smaller mass of hot gas that is at high pressure; that then contracts to a smaller volume as it cools. Airgun moderators handle a larger volume of gas at lower pressure (for the power they produce). Because airgun exhaust is cold, the thermal shrinking effect...

For offhand shooting I seem to like rifles around 40" long, with barrels either side of 20" long. Being greedy with barrel length might optimize velocity, but may compromise the rest of the system. I like rifles that weight either side of 7 lb for the same reasons: Weight, balance and the...

Scroll down at this link for a boat load of macro pellet images: https://www.crosman-air-pistol-owners-forum.com/board/index.php?topic=637.0

Spartan, The image grab below may be from the video you mentioned. It is on the MDT Sporting Goods channel. They started with a 6 foot long .308 Win barrel, and shot 175 grain factory loads to capture the velocity as they cut the barrel shorter incrementally. The results may be different...

It depends on the volume of air and its pressure, dumped into the barrel by the valve. It depends on the expansion volume of the barrel. Thus, the smaller the caliber, the longer a barrel can be and still gain velocity - if you can dump enough air into it, fast enough. As a small barrel bore...

Should not be causing an unusual problem. Experimenting with reg pressure may be instructive. That way you can see for yourself how reg pressure and sound correlate; when the other settings are configured to produce the same power. Setting for lower power should make the PCP quieter; as...

BBRemedy and cavedweller; If the gun is loud because the pellets are supersonic, then reducing the reg setting makes sense. Else, a high reg setting with a low hammer spring preload/short valve dwell is actually quieter than a low reg setting and a lot of hammer spring preload/valve dwell...

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...