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I've used Hoppes #9 for cleaning the bore of my air rifles for years. My breech and bolt O-rings, whether Buna-N or polyurethane, always end up failing due to wear (abrasion). When removed, they show no detectable difference in compliance of the sort you would expect from chemical degradation...

A hard tip is theoretically beneficial for penetration, but the number of real world scenarios where insufficient penetration is a problem is few to none when simply using a conventional domed pellet. And in most cases a quality domed pellet will be more accurate, which is of far greater...

Regarding JSB label, Air Arms label, or FX label...my experience has been that I have about equal odds of getting a good batch. Or in other words, I wouldn’t hesitate to buy a few tins of the FX 8.4 from Trenier at $12 ea. Still slightly cheaper than Pyramyd’s inflated buy-3-get-1-free...

One approach is to size the pilot to the choke. The pilot needn’t be so long that it extends past the choke. Another approach is to use an expandable pilot that locks into the bore, and allow the pilot to spin within the cutter head.

A plain pilot carries a moderate risk of damaging the lands. A floating pilot is pretty safe by comparison.

The usual reason: slight regulator creep + excess hammer spring tension.

Most likely the hammer spring tension is adjusted heavy (operating on the velocity plateau or close to it).

In my experience, O-rings from practically any reputable vendor are a safe bet. Where it can get sketchy is with the cheap assortments sold by Aliexpress, Amazon, eBay, or similar. Even then, mostly just benign parting lines/flashing from what I’ve seen, not necessarily with the material itself...

Yes, if taking a very small sip of air from a large plenum, the pressure drop may be insufficient to open the regulator’s valve seat a meaningful amount. However if the effect is a wide ES, it is an indication of a system imbalance…something that can very likely be remedied or improved...

Barrel prep is a very broad topic but here are a few threads you may find interesting: Barrel troubleshooting and accurizing for the DIYer (and an example) Bore lapping versus polishing and fire lapping versus cast lap Barrel crowning - brass screw method Barrel machining Barrel machining -...

A slow leak there usually indicates the poppet isn't sealing completely. You can use a light abrasive slurry (ballpark of 600 - 1000 grit) to lap the surfaces together. Color the mating surfaces with a black Sharpie or dye, then spin the surfaces together for a short time, and wipe it clean...

Just a quick question and comment. Are you speaking of the HM1000X with a 480cc bottle? If so, running your numbers says its efficiency is in the ballpark of 1.50fpe/ci. That's very good for a .22 running at nearly 50fpe.

Links to popular troubleshooting and tuning topics: Barrel troubleshooting and accurizing for the DIYer (and an example) Bore lapping versus polishing and fire lapping versus cast lap Barrel crowning - brass screw method Barrel machining Barrel machining - reamer selection for leade Adjusting a...

Since we are on the food theme, my favorite Amazon review. Sugar-free gummy bears.

When out hunting, your ability to remain still and quiet is advantageous. But don’t kid yourself

From what general area did the air rush out?

Considering the $130 I paid for it versus the time spent working the leade + lapping the bore + crowning, it would feel like a profound loss to send it back for a refund. So I’m hanging onto it until I find the time and motivation to remedy the issue. Pretty sure a lightweight hammer and...

Did you make progress on troubleshooting?

...And then once you’ve found the max, dial it back to about 97% of the maximum. So let’s say it tops out at 940fps, dial it back to about 940*0.97 = 912fps. When adjusted in this manner, the extreme spread will tighten up. If for some reason it’s still not acceptable, report back and we can...

x2 on Firewalker’s advice. Also may want to try backing off the hammer spring tension ever so slightly. This behavior is representative of the fact a regulator’s output pressure will trend downward a little as the reservoir pressure falls. If the HST is set too strong (i.e. close to the...