I clean about the same frequency as the OP (when the specific rifle/barrel says its time or somewhere around 250 - 500 rounds). I know this sounds complicated, but it really isn't too bad. The key takeaways are: The JB part only needs to be done once in a while, not every cleaning (I let the borescope tell me when by looking for carbon build-up/carbon rings, otherwise just pick a frequency based on the bore diameter and powder used, Varget = more often); A couple quick, dry bore-snake passes at the end of each shooting session while the barrel is still warm also seems to slow the accumulation of carbon; My biggest focus is on keeping the chamber and throat clean. To me the rest of the barrel is of lesser importance. Sometimes I just do the chamber/bore cleaning steps, followed by a couple dry patches.
Equipment:
- Coated Dewey rod, 44"+
- Pierce jag
- Short cleaning rod with low-profile, non-rotating handle
- Large slotted jag (for the non-rotating cleaning rod)
- Bore guide with a solvent port, mostly Possum Hollow's (affordable and you can call and order one to fit any action)
- Bronze brush in the correct caliber size
- Oversized bronze brush (approximately the diameter of the chamber)
- VFG bore pellets in the appropriate caliber size (prefer the aggressive pellets) and the cleaning tip adapter for their use
- Bore Tech C4
- KG12 Copper solvent
- Small can of Kano Kroil
- J-B non-embedding bore compound
- Appropriate bore snake
Method:
Bore:
- A couple/few patches of Bore Tech C4, alternating between wet & dry and giving the dry patches a little time to soak.
- Multiple passes down the bore with a correct-caliber-size bronze brush, wetted with C4. Approximately one pass for every 15 - 20 rounds fired since the last cleaning. I haven't seen any issue with pulling the brush back through the muzzle, and do so as long as the brush can be pulled straight back (some stocks make it so the cleaning rod is flexed or angled when the brush comes back through the muzzle).
- Let the C4 from the brushing soak for a bit.
- A couple more alternating wet/dry passes with C4 until the patches come out clean.
- One wet patch with KG12, let soak, followed by one or two dry patches. Usually this is all that is needed, but I may use one more wet patch of KG12 with a barrel known to be prone to copper fouling. Note that the KG12 does not turn the patch blue to indicate copper, but it works like nothing else that I've ever tried (verified by borescope).
J-B/VFG Pellet step (optional):
- Add one or two VFG bore pellets to the cleaning rod adapter and adjust for a snug fit in the bore. Quantity of pellets depends on which cleaning rod tip adapter you have. Adjustment of the pellets fit in the bore is apparent once to you see the setup, but basically when you compress the pellets in the adapter, they expand outwards (larger diameter). I prefer the aggressive pellets, but either should work.
- Lightly soak the pellet/s with Kroil
- Wearing a nitrile glove, apply the J-B compound by hand (finger) onto the VFG pellet. I target an even coating of JB around the entire pellet.
- Pull the chamber Bore Guide back 1/4" - 1/2" and insert the cleaning rod with VFG pellet/s and J-B.
- Short-stroke the neck/freebore/throat area and approximately the first 6" of the bore. I like to do approximately one full pass per 15 - 20 rounds fired since the last cleaning.
- When done short-stroking the chamber I usually make a few (2 - 6) careful passes through the entire bore, avoiding letting the VFG pellets exit and re-enter the muzzle. If they do exit, I unscrew the pellets before retracting the cleaning rod.
- Follow up with a couple patches wetted with C4 and a few more dry patches to remove any J-B paste residue.
Chamber/Throat:
- Using a short-fixed cleaning rod with slotted jag, insert a couple large, overlapped patches into the slot. Enough that the patches can slide snuggly into the chamber, contacting the chamber walls.
- Wet the patches and insert them into the chamber without using the bore guide.
- Spin the fixed cleaning rod with wetted patches in the chamber, while continuing to push forward. The objective is for the front of the wetted patches to start to enter the neck/free-bore/throat area of the chamber.
- Stop spinning the cleaning rod and leave it inserted in the chamber so the wetted patches can soak for a bit while in contact with the chamber/throat.
- Resume spinning the fixed rod a few times while slowly removing it. Make sure that only the patches contact the chamber/throat throughout this entire process.
- Swap the slotted jag on the fixed cleaning rod for the oversized bronze brush and insert the bronze brush into the chamber while slowly spinning it. Continue pushing while spinning until the front bristles of the brush are contacting/spinning-in the neck/free-bore/throat area of the chamber. I usually spin the brush slowly by hand for anywhere from less-than-a-minute to a few-minutes, but this is really based on whether I have a carbon ring forming or not (borescope used to determine).
- Continue to spin the brush as it is removed.
- Swap back to the slotted jag on the fixed cleaning rod and add large, overlapped patches into the slot again.
- Spin the fixed cleaning rod with dry patches in the chamber as done earlier with wet patches.
- When finished, push one or two dry patches through the entire bore with the long cleaning rod.