Big Blast and BW

[swolf]

New reactive target item on my local Wally World sporting goods shelf; Big Blast target caps.  Uses a regular soda bottle.  Special reinforced fill cap is screwed on, bicycle pump and ball needle inserts to pressurize, and target is ready.  My first shot at a pop bottle was actually with my Crosman 760, and when the bottle exploded it BLEW OUT MY FREAKIN EAR DRUMS! (Yes, I did not have hearing protection because it was a BB gun....)  The blast is pretty close to a 12 ga. shotgun going off!  I grabbed my BW and some Colibri powderless rounds and pumped up another bottle.  Takes about 80 lbs of pressure.  The first two rounds bounced, but the third penetrated and sent the bottle spinning like a deflating balloon.  I found my SUPER Colibris and the next bottle went BIG BOOM! Bottle blew to bits. Instructions recommend at least 700 fps.  YouBoob videos show blowguns and slingshots working well.

The package of 10 caps was about $10, and they are reusable as long as you don't hit them with the round.  Any bottle using a pop-type cap works--cheap water bottle don't fit.  HOWEVER, for about $10 you can buy 25 replacement soccerball valves, drill out a cap of any size, and do the same thing with a water bottle.  I did discover that sports drink bottles blow out at the bottom when trying to pressurize, but any size pop bottle works well.  Small bottles fill to a higher pressure and seem to have a louder boom. 

[Warthog]

Cool, wonder if the sell them around me?  Guess I will look around and see.

[swolf]

flEaBay has them also.  Some stores have an older version that doesn't have a lanyard hole in the cap to keep it from flying away and lost.  The cap can be hung from a cross beam so you don't have to hunt for it.  The shots I took sent the cap off into the bushes.

[Stuffgeek]

Pretty cool and the price is right

[Bluelitenin]

Nice, I might have to try this. Always fun when stuff blows up

[OLD and GRUMPY]

Just Emailed the boy. They have the prime shipping!

https://www.amazon.com/2211187-Umarex-USA-Blast-Targets/dp/B071XJG23P/ref=sr_1_1?ie=UTF8&qid=1505177873&sr=8-1&keywords=Umarex+Big+Blast+Target+Caps

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Now for the Mods------

Red food coloring and half fill with water--- OR    Baking Soda and vinegar!!!

[swolf]

Old Grump: Perfect for the grandkids!  They will LOVE filling and pumping the bottles getting ready to shoot.  Ground up sidewalk chalk gives a great puff of color.  More perfect opportunity to teach use of safety glasses, and adds the element of gloves to protect hands from bottle blast.  I like the idea of kids learning ALL aspects of shooting, from the loading to the target prep and cleanup, to the gun cleaning and care.  I had neighbor kids that I required to help clean and store guns for the next use, and they loved the "ceremony" and procedure of the whole process.

[OLD and GRUMPY]

Sounds good.  Line chalk should work with no grinding.

The 5 year old helps wash and sort shotgun hulls. Next step he can punch and size them.

[swolf]

Great idea!  I didn't think of line chalk.  Probably isn't as cheap as sidewalk chalk at the dollar store, but would be more convenient with the spouted bottle.

[OLD and GRUMPY]

I don't remember if I posted this.   I mixed line chalk with alcohol like pancake batter and filled the top of clays. Not as good as I wanted but will be fun for kids to make and shoot.

[Bj]

Does the bottle stay in one piece?

[Gog]

Both the OP's post and the clay pigeons post are very cool ideas!

[swolf]

The bottle fragments into 2 or 3 pieces.  If the cap isn't tied to something it will go flying.  Eye protection is a must!  Instructions recommend gloves too as the bottle can fail while getting it set, and the concussion can split a hand open.  The thinner bottles I have used seem to stay in one piece.  I haven't shot many 2 litre bottles, but they stay in one or two pieces.  I imagine pumping bottles up to a higher pressure will cause more fragmentation.  Website says up to 90 psi.  A BoobTube video test showed 2L bottles blow at about 150 psi, and smaller pop bottles blow at 180 psi.  I seem to remember hearing that the same amount of plastic goes into all pop bottles, so smaller bottles tend to be thicker (does not apply to cheap water bottles that can be thin enough to crumple just by holding them.)  Dasani water bottles have a pop-type cap, and have a fairly thick wall.  I filled one to 90 psi and let it sit for 2 days with the Blast Cap on it, and it held pressure.  AND it boomed like a shotgun.  Putting some water in the bottle seems to make it blow with lower velocity projectiles if hit under the waterline. 

[Canoeal]

I think it would be more effective if you filled the bottle wit water befor pumping it up...

[Bigbird48]

I would think the more water the less boom as the water will absorb the sound. Just my thoughts

[Bj]

More air space allows more compressed air which creates the reaction.  Water does carry sound very well.  Maybe would take some experimenting.

[ikoiko]

Not sure what you mean by "carry", but sound travels faster in water than in air.

[Warthog]

Gonna get some of these caps and shoot them.  It looks like a good target that tells you if you hit for sure.

[OV-1D]

  They say whales can hear each other across oceans , heck I can't hear the wife in the next room but that's another topic .

[Bigbird48]

Simple experiment throw a fire cracker in the air then throw one in water which is louder

[Canoeal]

I was not referring to just the sound, but also the visual effect, and the physical...

[ikoiko]

Not sure what you mean by "carry", but sound travels faster in water than in air.

Uh, not sure what I meant by that post (long night at work, and misread) , other than sound traveling faster in water.

And, added water, I agree would make a better visual .

[Bj]

By "carry" I just meant sound travels, works good, in water.

[swolf]

I shot two 16oz diet Dew bottles with about 4 oz water, and one empty.  Sound was the same.  Bottles with water split open more than the empty.  Didn't make as big a splash as I thought but those bottles are fairly thick and don't shatter like others.

[Bigbird48]

I think someone said FILL! the bottle before pumping up, and if you fill it then add some what little air you can pump into it the sound will be severely muffled. I agree that putting a few ounces of water in will not affect the sound to much and will give a better visual effect
sorry if I misunderstood . 

[swolf]

2 more 16 oz diet Dew bottles.  One empty, one filled with 12 oz water.  Water bottle popped with a dull thud and kept 1/4 of the water inside, empty bottle popped with a blast much louder.  Water bottle split almost in half, empty bottle stayed intact but went flying away.

[OLD and GRUMPY]

Black Friday   20% off.

https://www.pyramydair.com/s/a/Umarex_Big_Blast_Target_Inflator_Caps_10pk/7869