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Posted: 2/6/2011 10:25:31 AM EDT
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Before I spend 30+ minutes cuttin a piece of steel with a dremel tool tell me if this will even work!
First off I have some 654512 Steel. I have shot a twice as thick piece with M855, M193, M856, and 7.62x54r. In comparison to the thinner piece of metal the crater left by M855 would penetrate through 3/4 of the thinner plate, M193 would penetrate 1/4, and 7.62x54r would come close to 7/8 or even full penetration. Now my question is, if I do hit the piece of metal, will the shock of the bullet hitting the plate destroy the light sensors anyway? Do you think this is stupid or a good idea? Also would putting something between the chrono and metal plate be a good idea, such as rubber? MetaL 
how it would sit (I am cutting the top piece of the metal off) 
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| I believe the shock to the light sensors as well as to the printed circuit board would be substantial enough to break the Chrony anyway, so I don't think there will be much to gain from this unless you also somehow build a shock dampening system between the plate and the chrony. |
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In. I foresee a thread entitled "Do I need to go to the ER for this ricochet wound?" in you're future. Nooo, I see a "Do I need a lawyer because my ricochet clipped the guy shooting next to me at the range and now hes suing me." No need to armor your chrono, just use it correctly. The only thing is get s few extra wooden dowels for rods, cause my friend says you will do that one day. But so far I have not done that. |
| Nothing about what your doing IG is advisable. Not even close to smart. Best course of action is to direct your fire. That might mean securing your rifle to a bipod or resting on shooters bag.... this is also the reason we say there are two types of chronos. Those that will get shot and those that are shot... It's also reason enough for not spending a lot on one either. |
Well I bought a $100 one, but to a 19 year old $100 is a lot to destroy 
I guess I wont. I'm just afraid of correctly compensating for scoped rifles such as my 18" SPR . I doubt I will beable to see the chrono easily with a 3-12x scope. I'll just stick to my 16" with irons. |
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You need to slope the plate at least 45* or more, and isolate the plate from the chrony. With the plate mounted to the chrony, the shock from a hit WILL destroy the sensors. Mount the plate to a piece of wood or steel that sets in front of the chrony. This might not be acceptable on your range though, as any round that hits the plate will likely be deflected upwards and over the berms. As is, your set up dumps the full energy of bullet strike into your chronograph. With a sloped plate it will deflect the round and the chrony will only experience a percentage of the hit. You would still need to isolate the plate from the chrony.
G |
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IG. We keep our rifles at recommended distance and align Target at short distance say 50 yards or less. We check our alignment after each shot. Muzzle blast will move chrono if not secured. So far, knock on wood this method has worked well. Attach chrono to tripod and shoot from secured rest is even better. Posted Via AR15.Com Mobile |
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A 0.224 52 grain bullet at a muzzle velocity of 2,800 fps, with a scope mounted 1.5 inch above the barrel bore and sighted in at 25 yards will have the following bullet drop:
0 yards -1.5 in 5 yards -1.18 in 10 yards -0.87 in 15 yards -0.57 in 20 yards -0.28 in 25 yards 0 in (from point mass ballistics solver) |
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In. I foresee a thread entitled "Do I need to go to the ER for this ricochet wound?" in you're future. Nooo, I see a "Do I need a lawyer because my ricochet clipped the guy shooting next to me at the range and now hes suing me." Let us Know how it works out for you |
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The shooting range I would be doing this at is a private club with not many people there. I do not know why but I am paranoid and refuse to chrono stuff with other people there watching me.
Also all of the target stands at the place are made out of steel and have thousands of craters. |
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Whatever you do, don't lend your chrony to a 'friend'. Before:  After:  However, he did make good on his mistake. The replacement sensor box cost him $50 because he didn't destroy the computer that sits remotely on the bench.  After I got the replacement box we had a good laugh and a couple of beers over it. I told him there are two types of chrono users. Those who've shot their chrono and those who are going to shoot it. BTW, I suggest that you take plastic soda straws and use them for uprights. I bet if you hit the steel rod it will also break the plastic sensor housing it sits in. I've hit my straws a couple of times and they just get clipped off and are easy and cheap to replace. I guess I'm on borrowed time as I've only hit the uprights .................................. so far. Do you think hitting the soda straws gives me credit as one who has shot his chrono or am I still at risk?  ETA: As far as armoring your chrono, you want the front steel to slope as flat as you can to keep the ricochet down to something reasonable. I'd make the front slope at 30° and build a steel box for the chrono to sit in. I'd also rubber mount the chrono in the steel box to shock isolate it from the box. Also, make sure that you're using a heavy duty tripod so the thing doesn't collapse from the weight.  |
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You need to slope the plate at least 45* or more, and isolate the plate from the chrony. With the plate mounted to the chrony, the shock from a hit WILL destroy the sensors. Mount the plate to a piece of wood or steel that sets in front of the chrony. This might not be acceptable on your range though, as any round that hits the plate will likely be deflected upwards and over the berms. As is, your set up dumps the full energy of bullet strike into your chronograph. With a sloped plate it will deflect the round and the chrony will only experience a percentage of the hit. You would still need to isolate the plate from the chrony. G My thoughts exactly. I would suggest setting the angled plate well in front of the chrony, like 3 or 4 inches. This of course is if you have the proper backstop/clear distance downrange. The schrapnel from the bullet may destroy the skyscreens or supports though. |
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Not mine, but saved the picture cause I wanted to copy it someday... http://i55.tinypic.com/118iq7p.jpg Now, wouldnt you want to angle it downward so the shrapnel goes into the group, not into the air? |
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Not mine, but saved the picture cause I wanted to copy it someday... http://i55.tinypic.com/118iq7p.jpg Now, wouldnt you want to angle it downward so the shrapnel goes into the group, not into the air? Probably wouldn't be a big deal with 22 LR or 223 or other SCHV rounds, but it could be dangerous if you hit it with heavier stuff. Those richochets can go for a distance. It would be more difficult to make it deflect downwards. I have thought armoring my chrono. I could have used the wooden dowels instead of metal. I have grazed my metal rods a couple times, and once, while testing 45 acp, got to watching numbers and not the sights, and bam, smacked the hell out of one of the front rods. Now you can't hardly shove rods in the two front holes, completely busted the plastic. Brett |
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Ok Lets see If I can make a Suggestion This has faired me well I have never shoot my Chronograph, However I have Grazed it 3 times but never again
I set the Chronograph on a tripod run it out its distance with the computer firmly secured on the bench. Place a Target directly behind the Chronograph Remove the Chronograph Pick a Spot on the Target The same Spot i will aim at for the Chronograph Session. Fire 1 round. Take the Chronograph set it up to the point of impact, adjust as needed. As long as you keep your POA at the same "spot" you will not Hit your Chronograph. and with 60-100 rounds through it I end up with a Hole the Size of a Dime It is a Thought and works well for me 1200 tests through it since the last&final Grazing Walmart has a cheap tri pod that will suit your needs well |
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I just bought a 3/8" x 4'x8' sheet of AR500 plate and will probly have some drop offs that will work for ya. I would think that as long as you have the plate angled downward any bullet fragments would go downward. Except the pieces that occasionally come directly back (especially with a high powered rifle round). The units with anything but cheap plastic sensors in front of the gun are just an accident waiting to happen. |
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Don't shoot your chrono would be my advice. Additionally, don't let your friends shoot your chrono either.  I agree. I don't understand how you can hit something so close. Now if you were trying to chrono a load down range, I'd simply set a gong in front (not touching) the chrono. |
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Is it that hard to just make sure your arent going to hit the chrony before pulling the trigger? I dont have a Chrony yet, so take that for what its worth. I've seen idiots who will tell you it's only a matter of time before you shoot your chrono.
I find this COMPLETELY unacceptable. |
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Don't shoot your chrono would be my advice. Additionally, don't let your friends shoot your chrono either. I agree. I don't understand how you can hit something so close. Now if you were trying to chrono a load down range, I'd simply set a gong in front (not touching) the chrono. It's not hard. Especially if the Chrony is close and you are using a Scope mounted 3 1/2" above the bore. That 3 1/2" error at 10 ft is sometimes all you need to ventilate your Chrony. |
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... Place a Target directly behind the Chronograph. Remove the Chronograph Pick a Spot on the Target The same Spot i will aim at for the Chronograph Session. Fire 1 round. Take the Chronograph set it up to the point of impact, adjust as needed. As long as you keep your POA at the same "spot" you will not Hit your Chronograph. and with 60-100 rounds through it I end up with a Hole the Size of a Dime... Bingo |
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Quoted:
You need to slope the plate at least 45* or more, and isolate the plate from the chrony. With the plate mounted to the chrony, the shock from a hit WILL destroy the sensors. Mount the plate to a piece of wood or steel that sets in front of the chrony. This might not be acceptable on your range though, as any round that hits the plate will likely be deflected upwards and over the berms. As is, your set up dumps the full energy of bullet strike into your chronograph. With a sloped plate it will deflect the round and the chrony will only experience a percentage of the hit. You would still need to isolate the plate from the chrony. G If the plate was set up to deflect down this would work much better. But I agree with most of the other posts. THIS sounds like disaster from any angle. |
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