I can't imagine the lands are only 1/2 thou high!.... If they are 0.457" and the lands are 0.458", you would barely be able to see or feel them.... In your photo, they look VERY high.... deeper than most airgun rifling, in fact.... Bob
Quote from: Airgun-hobbyist on October 10, 2021, 11:03:43 PMFine job making the thing more accurate and consistent Ironman482. The fps spread looks really good through shots 3 & 4 for long range accuracy. Check out the taper on the lead flutes as well. They are probably going to need attention there, just like the crown did. A Morse taper #8 with some relief grinding on the big end (down to .457") should do the trick there. Did you happen get a bore diameter measurement of the slug? My bore is at least .460" but I need more slugs to test to be 100% sure. I hope the NSA slugs I ordered fly well because they only go to .457" but powder coating on them should seal things up all the way. are you talking about a reamer (Morse taper #8 ) and is there different grades , fine ,med or coarse ,maybe called a finish reamer, I don't want to make it worse.
Fine job making the thing more accurate and consistent Ironman482. The fps spread looks really good through shots 3 & 4 for long range accuracy. Check out the taper on the lead flutes as well. They are probably going to need attention there, just like the crown did. A Morse taper #8 with some relief grinding on the big end (down to .457") should do the trick there. Did you happen get a bore diameter measurement of the slug? My bore is at least .460" but I need more slugs to test to be 100% sure. I hope the NSA slugs I ordered fly well because they only go to .457" but powder coating on them should seal things up all the way.
I can't imagine the lands are only 1/2 thou high!.... If they are 0.457" and the lands are 0.458", you would barely be able to see or feel them.... In your photo, they look VERY high.... deeper than most airgun rifling, in fact.... I was measuring the unfired slugs not ones that had been pushed thru the bore , I've never slugged a barrel , I did try to push one down the 357 challenger barrel and the effort was so much that I gave up after about 1 inch and drove it out from the other end, what is the proper way to slug a barrel?Bob
Since I have a bunch of slugs that are probably too small for my 45 , l'm thinking about powder coating them , can someone school me on this process , tools involved, and how much you can expect to increase diameter.
Wondering if you cam remove the barrel without degassing .. Need to clean the barrel good...
Quote from: cosmic on October 13, 2021, 12:49:07 PMWondering if you cam remove the barrel without degassing .. Need to clean the barrel good...Yes. I loosened the 15/16 barrel nut, removed the shroud, loosened the clamp screws and this is where I should have marked the barrel with a paint marker where the barrel passes through one of the barrel band clamps. After every thing is loose you can start turning the barrel, there are a lot of threads.
Quote from: Spacebus on October 13, 2021, 01:40:39 PMQuote from: cosmic on October 13, 2021, 12:49:07 PMWondering if you cam remove the barrel without degassing .. Need to clean the barrel good...Yes. I loosened the 15/16 barrel nut, removed the shroud, loosened the clamp screws and this is where I should have marked the barrel with a paint marker where the barrel passes through one of the barrel band clamps. After every thing is loose you can start turning the barrel, there are a lot of threads.Haven't had a chance to test mine yet, but thanks for the tip. Didn't realize any of it was connected to the trigger. Getting the band clamps put back in the correct position matters, as they control the angle and position of the trigger and safety, as well as the linkage back to the sear. I found that the trigger linkage needs to be in the just the right spot or the safety will not work and the gun will fire even when the safety seems to be engaged.
Quote from: Ironman482 on October 12, 2021, 05:53:49 PMSince I have a bunch of slugs that are probably too small for my 45 , l'm thinking about powder coating them , can someone school me on this process , tools involved, and how much you can expect to increase diameter.I have had very good luck with the wet powder coating method and plain old Harbor Freight powder coating paint - especially the black color, though white works as well but white tends to result in a thicker coating than black. The wet method for me is much much more even and has a better result every time compared to the dry method.Equipment needed:toaster ovenpowder coat paint ($6 at HF)Lacquer thinnermetal screen/mesh to make a couple of small rectangular pans to bake the slugs2 plastic tubs with lids to shake slugs inIt does not take much PC paint to do a batch of slugs. I buy OxyClean powder and there is a little 1 oz scoop in the tub. I use about 1/3 to 1/2 a scoop to do 50 slugs at a time.Steps:1) Put slugs into a tub, add the PC paint, add about 1/2 oz of lacquer thinner, pop the top on and swirl around and shake about 10 seconds. 2) Put the screen "pan" you make (sized to fit into the toaster oven) onto a piece of cardboard and dump the slugs into the pan3) Bake at 400F for 20 minutes then allow to cool for 10-15 minutes or so.4) Remove the slugs and break apart any that are stuck together5) repeat steps 1-46) place slugs into the 2nd tub. spritz with WD-40 or your preferred lube and shake with top on so they are evenly covered. The lube is so the PC does not get damaged while sizing7) size the lubricated slugs. you are doneI do 2 batches at a time, using 2 screen "pans" so that one can be cooling while the other is baking.