Get yourself a muzzle loading barrel, cut the threaded breech off and shoot roundballs, the muzzleloadin barrels have a twist rate designed for lower velocities, although you may still wnat a faster twist rate ie 1-48 or 1-24 even.

sorry double post

Have you fired anyof the fin stabilized projectiles yet?

Thanks for the tutorial. :lol: i like pie.

Cool thanks, I was going to make a short stroke pump and drive it with a camshaft and a flywheel.

So i got some brass roundstock i intend to make hybrid with, but i dont have any type of pump, so i thought i'd try my hand at making my own and figured id look for some tutorials so if anyone knows of any then tell me.

I dont think those tiny little grooves will impart much spin to a projectile, has anyone tried one of their rifled barrels yet? It would work much better if you carved a groove on the dowel that was helical shaped and used a something to index as it is pulled throught the barrel, also i would sugges...

Are those hollow in the back like fostner slugs?, they look very prfessional.

Do not melt zinc, the fumes produced from burning zinc are much more poisonous than those produced by melting lead, Caution must also be taken when welding or otherwise heating any piece of galvanized metal. And yes i wear the appropiate safety gea, safety googles, respirator, rubbah slippahs the wo...

I notice that many of you who have built high powered, hybrid launchers do not use lead projectiles, most likely because lead balls are difficult to find in calibers over .75, so i will teach you my method of making a lead ball mould out of clay. I made a mold similar to the one i will describe to c...

Why not go on a muzzleoading roundball mould site, you can request a custom made mold in any caliber and then you can fire cast lead balls for extreme FPE and lead being dense it retains its velocity for a much greater range than almost anything else.

I knew the answer was somewhere in those 12 pages i just read, too much information at once i suppose. I see that the chrono'd shot was at 100x does he have data for the higher mixes? With this kind of velocity the only thing keeping you from .50BMG type power is the projectiles mass, if you were to...

Okay, I'm new here, i saw this linked from another forum and my jaw dropped. The thing i am wondering is how does larda keep this thing from a DDT? i read a few thread down that over a 4x or higher mix that DDT is a major concern and i was wondering how he got away with the 200x mix? Or is the canno...