Plaster casting .408 cal

[FighterAce]

Negative. Nothing in a 2km radius... Going to a pretty big hardware store in saturday to get parts for my next sniper rifle. I'll see if they have it. If they do, I cant buy it. The wood is gonna be expensive... walnut

[boar]

hmm there is a vynil dip you dip tool handles in cant remember what its called but it might be worth lookin too i think its also sold as liquid electral tape might not bee the same stuff but similar

Boar

[boar]

anything else going on with thisi had another thought maybe cast it out of bondo might be strong enough to hold shape

Boar

[FighterAce]

never heard of it/dunno where to get it

anyways... I finished the bolt and barrel of the M1000 Mik today. I'm going to rifle its barrel tomorrow and hopefully take a few shots with the setup.

[mouz]

whats the barrel made of?

[FighterAce]

1/2 green ekoplastik PVC

[mouz]

is it harder than normal PVC?

[FighterAce]

Yes and no... it has a wall thickness of 4mm and it can bend so theres no fear of shattering. It will handle up to 20 bar at room temperature and with the increase of temp its pressure rating drops because its a thermoplastic.
If you want to use it as an air tank I think its the safest way to go. I've taken it up to 30 bar with no problem because it has x2 (or x3 safety rating, not sure) and if I did go over the limit it would most likely fail at the weld. Its not an explosive failure.. I've seen it before. It just kinda goes out of the socket on one side and on the other it stays attached. Most of the time the failure is caused by a crappy weld  If it were to fail on the pipe itself it will rather split then shatter like regular PVC.
Are you planning on using it for something?

[boar]

bondo is a filled sandable two part polyester resin generaly used for autobody repair also used to some extent in composite tooling for temporary forms and shop aid tooling usualy available at auto parts stores and hardware stores there other brands of it with other names but bondo is the name most ppl in my area use to describe all of it kinda like band aids for bandages

Boar

[mouz]

no, i can't get green PVC in this country, i just wanted to know if it holds rifling better than normal PVC.

[FighterAce]

I've never had white pvc in my hands actually... what do you mean by hold rifling? Does yours wear out or something?

[mouz]

well, the ammo can scratch it, i tried shooting a shot load out of it and it really didn't like it. i think if i use one gun that had a PVC rifled barrel i would have to replace it every year at least, maybe every six months or so. how much does green PVC cost?

[FighterAce]

No wonder it doesnt last... how can you shoot a metal bullet out of a plastic barrel and expect it to be fine?  Get some metal barrels and shoot your slugs out of that.

$1 per meter for 1/2

[mouz]

thats WAY more expensive than normal. the white stuff is about $1 for 10 feet (about 3 meters) but thats still not bad. the thing is rifling a metal barrel in much harder. and no steel is touching with the steel slugs, they are duct tape wrapped. and what i said hurt it was a shot gun load, meaning lots of little rocks/BB's.

[FighterAce]

Rifling copper is not that hard 

btw. sry no test shots yet... I was testing my piston and bolt system over the last 2 days and while doing so the pressure gauge on my beto shock pump blew off at around  25 bar. It launched itself into the wall and fragmented on impact 

Guess I have a new priority... getting my copper pump working