SpudFiles

Use an appropriately sized hole saw. Harbor freight has a set 8 tool steel cups in the following sizes: 3/4", 1", 1-1/8", 1-1/4", 1-1/2", 1-3/4", 2" and 2-1/2" for $4.
Or better yet buy a 1"x 6"x 4' cut enough 1 foot lengths to equal your projectile length in inches eg, 4 inch of projectile length ...

very good JSR. ppk look-a-like is a hungarian FEG PA-63 its my daily CCW. The sig is a 220R. Also of notable mention is the Raging Bull in .500 Magnum and there is a 12GA from hell in with the rifles.

Need?? what does need have to do with it? why do you NEED a cell phone, why do you NEED a spudgun. I have them because I want them, and they are an ideal means to pursue dangerous or delicious tree's!

You know what they say about ammo, buy it cheap, stack it deep;when you think you have enough you ...

There is some other stuff in the other safe, but I don't feel like going to the basement.

Alright I was wrong about rain, shot towers, anna nicole marrying for love, global warming, staying at a holiday, electricity and water, lunchmeat and refrigeration, hamsters, antique computers increasing in value, gasoline as aftershave, sandpaper condoms, speeding through school zones, government ...

No no NO!!! Where did you learn that?!?!

well highskrewl and
here http://wiki.answers.com/Q/Most_aerodynamic_shape
here http://cr4.globalspec.com/thread/22706/What-s-the-Most-Aerodynamic-Shape
here http://www.imps4ever.info/tech/aero/tech_aero.htm
here http://www.f1-country.com/f1-engineer ...

I agree the sabot shod projectile will yield the highest muzzle velocity, but the teardrop shape is the most areodynamically efficient shape; that is why rain takes this form instead of being shaped like darts :D. I think finned projectiles are uniquely adept at their designed function: poking holes ...

I disagree, Jack. APFSDS is as you say designed "to retain as much velocity as possible downrange", this does not produce the most areodynamic design, fins are inherently drag prone, they do stabilize the projectile but there are other means of doing that. APFSDS also moves several times the speed ...

did you wiki drag coefficient? there is a pretty good page there to get you started

Thanks JSR, I knew you'd be along to simplify what I was suggesting. Generally yes thats it, looks like its not a new idea.

http://img98.imageshack.us/img98/3063/bspanimationqk7.gif

I saw this image and thought it could work with minor redesign.
Instead of the spring in the back use air pressure to move the bolt. Put the spring in the front to recoil the bolt. The bolt itself will need to be a hollow (like a thick ...

Interesting concept, but you would probably be better off using a single leaf spring from a car, cut in half. Then weld each half to a collar which would fit around a steel pipe sort of like a giant crossbow. then you could use a come-a-long to pull a cable stung between the leaves.
By the time you ...

Ragnarok is correct and incorrect. I didn't change the valve stats, because I don't know them, I would lean more toward his estimation in that respect. I definitely misunderstood something in the inner and outer diameter of the chamber (why would the program ask for outer diameter??) I used the ...

yes, 105 mm sorry for that, my memory was off.
http://img119.imageshack.us/img119/2217/ggdtui7.jpg
There's my ggdt read out, I have tried to optimize barrel size using the program and it seems the program is set up for guns using short large diameter barrels.
I was hoping to utilize a heavy ...

The flechettes seem to be on everyone's mind so here's the dope. The US military originally designed them for use in 155mm artillery "beehive" rounds (called beehive because thats what 1,000 of these raining down on you would sound like). The military decided these would be great as a shotgun load ...