Friday, April 3, 2015
Out of the blue, a viewer contacted me about some aluminum slugs that he machined.
What is unique about these giant, .700" x 2" rounds is they have riflings milled into the
sides. There are 6 milled slots equally and perfectly spaced around the slug. The
machinist even went as far as setting them a precise pitches, or twists. The ratio is 1:28, 1:20, and 1:10. In other words, for every 28 inches, a 1:28 pitch will rotate one turn.
That may not seem very fast but at supersonic speeds, the spin should be enough to stabilize the rounds.
Since we use a smooth bore shotgun, there is no rifling so this may be a solution for
stabilizing the rounds. We do not know if they will work or not, and that is the fun about trying these experimental rounds.
Wednesday, October 29, 2014
We will be shooting some capsules full of rust powder in our next series of tests. These capsules are the same ones used for the "water bullets". The problem with those was the shockwave/energy created a "hydroshock" that pushed the water through the plastic capsule and blew it out.
Instead of a liquid, we will use fine rust powder, and a little lead shot for weight. We all ready tested one and it left the barrel intact and the capsule blew up in a cloud of red dust when it hit a pile of sand.
We will try these in a few different configurations. The long tip will act like a vane and should cause the round to flip 180 deg. after it leaves the barrel. If the tip is snipped off, it may allow some of the rust powder to leave and it might have interesting results. If most of the end is cut off, then the rust should spew out of the gun in the big cloud.
Of course, we really don't know what will happen until we try them. I fabricated 7 of these rounds.
Saturday, October 18, 2014
At the last shoot where we shot the pellets, etc. we didn't have time to film some rust slugs I fabbed up. Not only are the shotgun shells old and rusty, the slug is made out of rust.
I had a bag of rust chunks someone gave me so I ran some of that through a coffee grinder to turn it into a fine powder. I then mixed the rust with hot wax.
Since smaller particles collectively have more surface area than the same volume of larger particles, we'll see how well these slugs hold up. More surface area, the stronger the bond and less space between the particles. In this case, bigger is NOT better.
The slugs are not very heavy, weighing in at only 4/10ths of an ounce.
Tuesday, October 7, 2014
We got some impressive results shooting .22 PELLETS out of a firearm using nail gun blanks bought at Lowes hardware. This was our second attempt at doing this. The first attempt, tried about 4 months ago resulted in failure. The first shot, the entire base of the blank blew off and most of the blast came out of the ejection port of the rifle. The rest of the case was stuck in the chamber and we did not have a cleaning rod with us to knock it out.
It seemed logical to fix the pellets right onto the ends of the blanks. However, this did not seat the pellets high enough in the chamber. I can only guess what occurred at the split-second, but I think the pellet did not transition from the chamber into the barrel smoothly, so the blast took the path of least-resistance, blowing the end of the case off right out the ejection port.
We had 100% reliability by muzzleloading the pellets so they were seated in the barrel, slightly above the chambered blank instead of directly on it. Although that is typically a bad idea to do, (short starting -look it up) it worked well in THIS application.
Monday, October 6, 2014
We finally got the custom muzzle-brake mounted on the Mossberg 590 and got to shoot some rounds through it. What's unique about this brake is it isn't held on by screws or welds, etc. It's a shrink-fit. The brake was made a couple thousands of an inch smaller than the barrel. The brake was heated up and it expanded and just slid over the barrel. Once it cooled down, it stays on tight as a drum. We got some cool muzzle flashes blowing out the sides during some filming today.