boolit proofed my new chrony

[jbunny]

i retired my old chrony after umteen years. the person responsible for the design
on this new model should be shot with balls made from his own ****. i have seen
a few of them ruined by hit on the guide rods. i used some 5/32 aluminum tig
welding rods that stick out about 3/4 inch and use plastic straws for guide rods.
the front deflector is 1 inch thick and it has saved my old chrony many times.
i used to have a weight and a string to pull the unit sideways to read it. now i'm gonna
try mirrors. the sunscreen is a breeze to install and remove, just drops in and lifts out
as a unit.
cheers
jb

[Blammer]

good design! I wanna know how you're gonna bullet proof the mirror?

[45nut]

I use the lime green weed trimmer line, the thickest available and just loop it around instead of the rods.
I have a couple pieces of 1/2" thick plexiglas to fashion a deflector if I can find the roundtuit I lost.

Your design is certainly stout, no longer sitting atop a tripod huh? I see where the test of the deflector has already been done.

[jbunny]

thanks 45nut. thats a very good idea. blamer, if u break my mirror, u get
to stand in the corner for 8 hrs and u get 7 years bad luck.
cheers
jb

[Potsy]

From the look of that crater in the plate, it's already paid for itself!!

[Bill*]

But how do you get it to the range?.....Tow it?

[jbunny]

Bill; i have a flat deck with a hihab crane comeing.
FWIW heres a pic of my old chrony and all the sunscreen patching.

jb

[BerdanIII]

Mein Gott! What do you normally shoot, 20mm Oerlikon?

[Sensai]

Now that's just plain cheating!! Where's the daring, where's the adventure?

[HamGunner]

I did not notice the first two gas check strikes (one low on front and one on the middle section above the readout screen) or I would have stopped before the readout took a hit. I used Scotch tape over the readout to prevent powder damage, but when I got carried away with the velocity on a K-Hornet round, the checks started coming off. Something that I had not had a problem with before.

My first Chrony was an F-1 chrony like JB's red one above, took a glancing blow from a Mini-14 that I had forgotten that I had remounted the scope and not resighted in. Chrony gave me a deal for trade in. I will see if they can either repair or trade this one.

I certainly will be building a better deflector next time that is a bit stronger than mere tape. Thanks for the ideas. My next Chrony will hopefully have the remote readout located on the bench.

[Mk42gunner]

While Chrony's are certainly an affordable and informative unit; I have never been comfortable with an expensive non target item in the line of fire; especially given that it is easiest to drop the forearm and read the display through the scope. Not that I would ever do that.

[Forester]

Another plus to the CED unit, the most expensive part is sitting safely on the shooting bench.

I still made some Lexan shields for mine, they would not stop a bullet but would probably do OK with a gas check, and they do fine with muzzleloader sabots.

[Triggerhappy]

Guys, guys, guys. The bullets are supposed to go through the sky screens, NOT THROUGH them.

[jbunny]

WOW!!!! did u figure this out all by yourself?

[Screwbolts]

My current Crony is number III

[jbunny]

i guess u don't beleave in once bit, twice shy
jb

[phaessler]

In lieu of mirrors wouldnt it pay to get the remote data display? Mine is a red one, cant remember the model but the display is corded, and makes it well back to the bench.
I am definently thinking now of constructing a similar shield. Great desing on this one Jbunny.

Pete

[mcdonl]

Hey... I have a dumb question... I am new to reloading, and casting... so I have never given a chronographer a thought... but... not that I have... do you place it at the target, mid way, at the gun?

Just curious.

Leroy

[coyotebait]

mcdonl
Most of the time a chrono is placed 10-20 feet from the muzzle, close enough to read but far enough to avoid muzzle blast.
coyotebait

[OutHuntn84]

Just in front of your gun, past any anticipated muzzle flash. After you know your velocity at the barrel, your ballistic table will tell you the down range (how ever far that may be) velocity.