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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...

Very nice! You're a natural. Pretty cool to see the before and after, both the closeup of the crown and the results on target. With any luck, your effort will inspire someone else who has been on the fence.

Bob's guides are excellent: https://hardairmagazine.com/ham-columns/the-definitive-index-to-bob-sternes-ham-technical-articles/ The one specific to regulated PCPs is https://hardairmagazine.com/ham-columns/tuning-regulated-pcp-airguns/

That combo should do the trick. Just plan to refresh the abrasive often (I.e. just add more) since J-B breaks down quickly into smaller particles. If you have a stick of medium polishing compound like the kind you load on a benchtop polishing wheel, you can scrape some of it off with a knife...

Dillon, clearing the burrs with a fine abrasive like J-B bore compound, it would be tedious, yes. Still less time than packing up the barrel and making arrangements to have someone else do it. Besides, what do you have to loose for having tried other than a half hour of your time? If the...

To clear burrs at the ends of the lands, the brass screw technique will do the trick. Light pressure...let the abrasive slowly do the work. https://www.airgunnation.com/threads/barrel-troubleshooting-and-accurizing-guide.1307337/

Just depends on the situation. If you're working with a barrel that has already been machined with a leade and port, it's tricky to do a breech pour in such a way that it doesn't get locked in place...a short pour, so to speak. In which case you may need to do a muzzle pour. But if you're...

Good point. The distinction between lapping and polishing is very important where the goal is to give high quality advice.

I assume you mean the lap was not filling out well, is that correct? The barrel most definitely must be hot and I would think a simple propane torch will heat the barrel adequately, provided you keep at it long enough to heat the steel all the way through. The way I do it is set up a heat gun...

One way to look at it is, lapping is always safe because you use feedback from the barrel itself to know where and how much. The essential thing is building the experience to recognize this feedback. If you are new to it, I can’t recommend strongly enough to practice on a barrel of low importance.