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twocan
May 7, 2009, 01:40 PM
Indoor Bullet Box

I am considering building a 4 foot by 8 foot Bullet Box for .22LR fired from my Glock 26 using the Advantage Arms Conversion Barrel from approximately 15 to 18 feet away.

Does anyone know what kind of backing material I would need to use to prevent penetration through the back of the box?

My initial design ideas are to use a 2x8 wood frame with 3/4" plywood for the back and possibly a steel plate and/or rubber sheet to contain the bullets with a thin sheet of plywood for the front.

I have not yet found the data necessary to calculate the forces generated by 40 grain .22LR bullets.

As a side benefit, it will make good cover in case of a home invasion.

Capt. Art

Superhouse 15
June 24, 2009, 06:07 PM
Can't speak for the box itself. There are commercial traps available that have an angled back. The bullet strikes and is broken up and deflected into the base of the box. You might look at those and copy.

As for energy, simple:

Velocity squared x weight in grains
_____________________________ (divided by)

450240

An example 40gr RN at 1050FPS= 97.9FPE

oneounceload
June 27, 2009, 11:21 PM
shooting .22 indoors will also have the issue of lead exposure from the bullets when firing....you need to consider ventilation also.......

as to the backstop, a piece of steel plate angled to send bullets down into a bed of sand works well

mikejonestkd
June 28, 2009, 04:00 PM
Our local club has a .22 indoor range and they use a heavy steel plate angled down into a bed of sand and it stops everything.

As mentioned above, ventilation is a primary concern. We have several fans that are located downrange that draw the air away from the shooter and out vents above the targets. fresh air comes from intake vents behind the shooters. That way the air is always moving away from the people.

You don't mention where you are located. It is illegal to discharge a firearm in some residential neighborhoods/ many towns/ most city limits. look into the legalities before you begin.
be safe

booker_t
July 21, 2009, 09:34 PM
2" of RHA backed by 1" of HHA should do the trick for pretty much anything you choose to shoot, unless you have a stock of homemade EFPs or some leftover RPG-7Gs you're eager to pop off.

Uncle Buck
July 22, 2009, 08:39 AM
I am also looking to build a bullet trap, but for large calibre hand guns. What are the initials "RHA" and "HHA"?

Thanks.

booker_t
July 22, 2009, 09:14 PM
RHA: Rolled Homogeneous Armor
HHA: High Hard Armor