6 dasher fireforming

[lpreddick]

did a bit of searching re winchester super grex shot buffer. it is added to shot in a shotgun shell to ? "buffer" the shot. the stuff is ground polyethylene that melts at 425 degrees F. seems some blackpowder shooters add it over smokeless powder used in vintage blackpowder cartridges shooting lead or gas checked bullets. they add just enough to keep the smokeless powder in the bottom of the case and bullet base touching the filler. they also use or used to use cream of wheat, Kapok or some form of Dacron to achieve the same effect. they suggested the material would seal a loose fit between bullet and bore and reduce gas blowby and leading of the barrel. pressures would increase so adjusting powder charges was advised. BAM! this hit me! many years ago i was loading something and the charge left a large empty space, so i filled it with super grex . the load was NOW too hot, so i gave up on that project. i weighed the cow needed to fill a 22 BR case at 28 gr, weight of super grex is 13.8 gr. the stuff is light and doesn't compress easily. i saw no residue in the cases and the bore looked normal. think i'll use it instead of cow.

 

[4xforfun]

I am curious about the "wearing out the tube ffing brass" thing. I admit, I used to think the same thing. BUT 200 brass will last the life of the tube if you are good to it...which should be north of 3000 rounds. In reality, I'm not so sure that a tube settles down, speed wise, till 50 to 75 rounds..you may as well FF some brass and have some fun!! To top it off, in my case anyway, My comp dasher shoots at it's best with 31g Varget/false sh older/267 neck/ 105 BT jammed to the lands. Great for F class and Steel..would love to shoot some pdogs some day with it. But not for comp. With the amount of crush I have when closing the bolt the gun upsets in the bags to much. Not good for speed shooting. Also, if a piece of brass fails you get impacts 1.5 to 2 min low.

Just my .02.

Tod