Author: Aaron Gordon
Date: 07:40:25 08/05/03
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On August 04, 2003 at 22:07:38, Robert Hyatt wrote: >On August 04, 2003 at 14:50:23, Aaron Gordon wrote: > >>Here is the load for a .220 swift doing 5000+ fps. >> >>http://www.reloadersnest.com/detail.asp?CaliberID=23&LoadID=1492 >> >>If you ever get around to trying this load, let me know. >> >>About the purple mist.. I'd assume that would be mainly from the copper jacket >>vaporizing. Is there some sort of coating you could put on it perhaps to help >>withstand the high temperatures? Teflon maybe? > > >It was a rate-of-twist issue. It wasn't so much the heat, as the centrifugal >force that caused the thing to fly apart. The thing doesn't have much recoil >so you could, with effort, keep the scope on the target, and on occasion you >could see the "purple mist" when the loads were too hot. Another amazing thing >is that late in the afternoon, shooting toward a setting sun, you can actually >_see_ a copper-jacketed projectile "flying" toward the target. More of a >"coppery after-image" but definitely visible, which is amazing for the human >eye. > >It is possible that the copper/lead bonding is better today, and moly coatings >are very slippery. I might go see what I can find for a new projectile when I >get a chance. > >I've not "gotten into" the new moly stuff. Lots of trouble to coat the inside >of the barrel, and then not cleaning it (which goes against everything I learned >from 40+ years of rifle shooting). :) One way to moly coat the barrel (I think) is to put some Slick 50 down the barrel. I heard this done many times with air guns, just not centerfire rifles. I wouldn't see why it would hurt though, probably create a nice coating and when you run a patch down it'd probably help get the gunk out easier as well as provide a bit better accuracy & more fps. All he did was swab the barrel w/ Slick 50 (first spraying it down with WD 40 to eat away at the gunk) and fire off a couple of rounds to 'activate it' and make the moly coating. Supposedly the guy got his Super Max 1000 (1000 fps airgun) up to ~1200fps or so by doing this, and reported the supersonic 'crack' of the pellet after firing. Here is the link, don't know if it'll be right for you but I'm interested in trying it on my SKS & Mosin-Nagant http://air_guns.tripod.com/restoring_air_gun_power.htm
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