Great Chronograph

[284driver]

You can take a cheap muzzle mounted laser boresighter to help center the sky screens. Use a piece of paper or cardboard and hold it up behind the screens alternating back and forth til its right where you want it.

A far safer method is to use the chamber mounted bore sighter. No chance of sending the muzzle mounted bore sighter down range should you forget it.

It only takes one distraction and ---------

I could then suggest hanging a red remove before flight banner on it

 

[bozo699]

You can take a cheap muzzle mounted laser boresighter to help center the sky screens. Use a piece of paper or cardboard and hold it up behind the screens alternating back and forth til its right where you want it.

A far safer method is to use the chamber mounted bore sighter. No chance of sending the muzzle mounted bore sighter down range should you forget it.

It only takes one distraction and ---------

I could then suggest hanging a red remove before flight banner on it

This really is no laughing matter, I have a very good friend and gunsmith that took a customers gun out that he rebarreled to get it sighted in and the barrel broke in by the customers request, decided to use a laser bure sighter to get the scope dialed to the target, I went up to my house for a second, When I came back he was shaking his head and cussing to himself, luckly he was not injured but I can't say the same for the barrel, it is very easy to get excited about shooting and forget the small un-noticed details! be careful people.
Wayne.

 

[DRNewcomb]

It takes me well under five minutes to position my sky screens and stands...less if someone give me a hand. Perhaps we need a thread on how this can be done more efficiently. I have seen quite a few fellows take a lot longer.

I remove the bolt, and set the rifle in bags, pointing at the center of my target group.

I take the chrono gates (already set up on the tripod) out to the position I want them to be. I set the height so I can see through the rifle bore, when my eye line of sight is ~4" above the top of the sensors - done.

Takes about 2 to 3 minutes.

All the set up of the sensors, gates, and tripod are done behind the firing line.

I chronographed some loads yesterday and used this technique to set up the screens. Worked like a charm. I just carried the tripod out to 10' and looked for the bright spot in the barrel then positioned the screens so I had them centered. Worked like a charm. Chronograph gave great, consistent results too.

 

[Raythemanroe]

I set my chronograph up with out putting the wire hood on and shooting through it on a bright day the numbers were everywhere! should that have happened?

 

[CatShooter]

I set my chronograph up with out putting the wire hood on and shooting through it on a bright day the numbers were everywhere! should that have happened?

When you ask a question like this, you need to say what chrono you have.

Bright over cast - bright sun? What is "bright"?

 

[DRNewcomb]

I set my chronograph up with out putting the wire hood on and shooting through it on a bright day the numbers were everywhere! should that have happened?

Optical chronographs require a diffuse light source, that's what the screens are for. On a solid overcast day you should be able to shoot without the screens, because the overcast provides a diffuse light, but not on a sunny day. Since the morning sun is from the NE and I'm shooting to the north, the sun shines directly on the opening for the optical sensor on my CED. I've started to use a small (4"x4") piece of black construction paper taped to the north side of the arms to cast a shadow on the optical sensor. This blocks stray light from entering the sensor so that it mostly "sees" the diffuser panel. IMO, it helps.

 

[Phil3]

Was trying to decide what chrono to get at some future date and then after reading this thread, the only choice may be the MagnetoSpeed. My range rules don't like anything happening near the shooting bench, except shooting. Trying to set up a tripod and stuff near the bench would probably not be frowned upon.

Phil

 

[DRNewcomb]

Was trying to decide what chrono to get at some future date and then after reading this thread, the only choice may be the MagnetoSpeed.

A good choice. I might have chosen a MagnetoSpeed except I had just received the CED by the time I found out about the MagnetoSpeed. Their big claim to fame is the convenience and minimal "fiddle factor". About the only things you can't do with a MagnetoSpeed is instantly* change guns or measure down-range velocity.

*I will keep a .22 pistol handy for a quick check to verify that the chronograph is working properly, so I don't have to use a "real" cartridge for that purpose.

 

[Steve Blair]

Optical chronographs require a diffuse light source, that's what the screens are for. On a solid overcast day you should be able to shoot without the screens, because the overcast provides a diffuse light, but not on a sunny day.

[br]
Not necessarily true. My PVM-21 is full-time active infrared. The source and sensors are located laterally. It is unaffected by ambient light and works just fine in total darkness.

 

[DRNewcomb]

Optical chronographs require a diffuse light source, that's what the screens are for. On a solid overcast day you should be able to shoot without the screens, because the overcast provides a diffuse light, but not on a sunny day.

[br]
Not necessarily true. My PVM-21 is full-time active infrared. The source and sensors are located laterally. It is unaffected by ambient light and works just fine in total darkness.

Yes and you can get an infrared source panel for the CED. It's still a diffuse source.

 

[Steve Blair]

Yes and you can get an infrared source panel for the CED. It's still a diffuse source.

[br]
No, it does not work with a diffuse source. The LS 260 Light Screen use a "light curtain" approach. There is an array of infrared LED's focused directly across onto an array of sensors. The units measure a calibrated interruption to the light value on the receptors. Both the source LED's and sensors are deeply shrouded and use a narrow, focused area. A complete description can be read here. [br]
http://www.kurzzeit.com/eng/ls260.htm

 

[searcher]

I had read about the ongoing development of the MagnetoSpeed chronograph and put one on pre-order with them about six months before they actually produced for sale. I couldn't wait - as I HATE having to wait for a cease fire to set up or take down my sky screen. Most of the time, I just want to fire a few shots of this or that to see where my velocities are before proceeding further. With it, you can just slip it on, bang, bang, and pull it off - done in a few minutes with no inconveniences. If you are thinking about buying one, consider that
1) They have two models now to my understanding. The first version (that I have) doesn't work with fat barrels (like over 1"). If you have fat barrels - get the one that will work with them. Now I must buy another. And yes, I MUST as I will no longer use the skyscreen unless I have to.
2) They WILL affect your tune, so once you are where you need to be (or want to be) on your velocity, back off your loads just a bit and work up again without the device on your barrel. You'll probably find a slightly different sweet spot.
3) If you've got some good laughs watching people shoot their Shooting Chronys at the range, your days of laughter may not be over. If you are sitting next to someone shooting and using one of these devices on their barrel, don't be shy to ask them if you can check to be sure they have it strapped on correctly. If I had done that, it would have saved me a few band-aids when a guy next to me shot his bayonet into multiple pieces. Funny at a distance - not so much up close.

 

[6BRinNZ]

2) They WILL affect your tune, so once you are where you need to be (or want to be) on your velocity, back off your loads just a bit and work up again without the device on your barrel. You'll probably find a slightly different sweet spot.

Do you have pictures to show - I have heard a lot that they will but no one has demonstrated it yet...or maybe there is a thread somewhere else you could point me at?

TIA

 

[bigedp51]

2) They WILL affect your tune, so once you are where you need to be (or want to be) on your velocity, back off your loads just a bit and work up again without the device on your barrel. You'll probably find a slightly different sweet spot.

Do you have pictures to show - I have heard a lot that they will but no one has demonstrated it yet...or maybe there is a thread somewhere else you could point me at?

TIA

6BRinNZ

Buy a No.4 Enfield and shoot it at 100 yards with and without a bayonet attached and watch the POI impact change.

When I use my Crocodile Dundee Magnum Roo Light I have to aim even lower.





NOTICE: No koala bears were hurt or injured during the filming of this posting.

 

[37Lincoln1]

LMAO!! BigEd you are certainly one twisted SOB, SMH!

 

[6BRinNZ]

2) They WILL affect your tune, so once you are where you need to be (or want to be) on your velocity, back off your loads just a bit and work up again without the device on your barrel. You'll probably find a slightly different sweet spot.

Do you have pictures to show - I have heard a lot that they will but no one has demonstrated it yet...or maybe there is a thread somewhere else you could point me at?

TIA

6BRinNZ

Buy a No.4 Enfield and shoot it at 100 yards with and without a bayonet attached and watch the POI impact change.

When I use my Crocodile Dundee Magnum Roo Light I have to aim even lower.





NOTICE: No koala bears were hurt or injured during the filming of this posting.

LOL - I like your pictures...I know POI moves...I own a magneto and have used it out to 900 yards. I developed my load without one and later on bought one.

I used it in my club days at 500 and 900 yards to see how the ES/SD went under match conditions...yes I had to come down 1 moa but I held the 10 ring....

I haven't bothered to go back to actually measure group size...more I am interested in someones actual data when they make a statement like that...not saying its not true...just want to see the data.

Its winter here but I have a new build coming and I am interested in actual data of it impacting tune...so I can more clearly make up my mind on how to approach the load dev.

 

[Raythemanroe]

Re: Great

catshooter, When you ask a question like this, you need to say what chrono you have.

Bright over cast - bright sun? What is "bright"?


I have a chrono F-1 that I bought for Archery but until I tried it without the hood it has worked okay for me! I had no over cast and it was in the a.m. with the sun directly on the Chronograph. I thought maybe the batteries were at fault but I kinda have to go with what ever I did different since this is the first time I have had a problem.

 

[searcher]

In response to 6BRINNZ, I guess you are talking of pictures of the aftermath of the bayonet that got shot up? If so, no, I didn't take any pictures. Didn't want to ambarrass the nice guy that it happened to any more than he already was. I didn't pay any attention to how he had it strapped on and he wasn't quite sure what happened. I can only guess it was on so loose it was sagging down into the path of the bullet or the strap buckle broke during the early part of the recoil cycle? Attaching it to the rifle really is quite straight-forward and the components seem more than adequate to the task IF the strap is not attached over a muzzle brake, etc. It was the first time he had used it. We'll never know..... It just looked like it had been whacked with a big hammer

 

[6BRinNZ]

In response to 6BRINNZ, I guess you are talking of pictures of the aftermath of the bayonet that got shot up? If so, no, I didn't take any pictures. Didn't want to ambarrass the nice guy that it happened to any more than he already was. I didn't pay any attention to how he had it strapped on and he wasn't quite sure what happened. I can only guess it was on so loose it was sagging down into the path of the bullet or the strap buckle broke during the early part of the recoil cycle? Attaching it to the rifle really is quite straight-forward and the components seem more than adequate to the task IF the strap is not attached over a muzzle brake, etc. It was the first time he had used it. We'll never know..... It just looked like it had been whacked with a big hammer

Nah - heard lotsa people state that the magneto affects tune...I understand the theory...but I haven't seen anyone provide evidence...as mentioned I tuned my rifle before buying a magneto...subsequently I bought one and used it out to 900 yards where I held the x ring.

I bought the magneto because I was fed up with cheaper chronys not providing readings under certain conditions.

I have a new build coming and I am tossing up whether or not to do load development with it strapped on or not..probably I will do it without. Normally my load dev is shot over the chrony so I gather as much information as possible...so with the magneto I will change my method a little.

I definitely won't be using bayonets, koalas or torches strapped on to the end of my barrel though

 

[searcher]

In affecting the tune, I did not mean that you can't obtain a tune with the magnetospeed attached to your barrel - you absolutely can! I have just found that once you take it off, I have, on occasion, lost the tune I had with it on. Then I needed to do a slight load tweak to get into tune without the thing strapped on. Still, I do all my load development with it on as you do. A good friend of mine also uses the magnetospeed and does all load development with it strapped on. We shot in a match together and he did terribly - something uncommon for him. We discussed the fact that he did not test the load without the magnetospeed strapped on. He strapped it on and - you guessed it - tight tiny groups again. I have worked up loads for a few of my rifles and did not need to re-tune. If your new-found load shots like crap after taking off the magnetospeed - just saying it should be looked at as a possible source that I KNOW could be a problem. If you duct-taped several ounces of lead to the end of a barrel - it will have an effect on many barrels . This is no different.