Author Topic: 100 Yard challenge/Cyclone  (Read 15793 times)

Offline erskine

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RE: 100 Yard challenge/Cyclone
« Reply #30 on: February 25, 2009, 02:35:56 PM »


If you zero a .22 Crossman Premier at 850 FPS for 83 yards. It will never rise more than 5" above line of sight and at 100 yds it will be 6.2" low.



Physics are physics..



... oh and it will still be carrying about 11 FPE on impact.



In a 10 mph full value crosswind (3 or 9 o'clock) it will drive about 13" that means that your group will string +/- 6.5" if your hold is perfect and the wind is variable, so from the looks of your pictures, you had a ten MPH cross wind and you held center.



Good shooting, now hold off for wind and see what you can do.






Even a blind pig finds an acorn once in a while.
http://www.blindpig.org/micers/blog.html

Offline MEHavey

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RE: 100 Yard challenge/Cyclone
« Reply #31 on: February 25, 2009, 02:53:54 PM »
What did you use for a BC and scope height?

Offline PelletPaul

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Re: 100 Yard challenge/Cyclone
« Reply #32 on: February 25, 2009, 09:43:50 PM »
Scope height:  Center to center: 1.5"  BC .033.  
If I were to sight in at 80 plus yards why not just sight in at 100 yards. Then there would be no drop.  But realistically my shots on game are fifty yards and under so sighting in at 25 yards covers anything 50 and under.
Next time I will be going to the desert for test and not that range you see.  Last time a person was shooting a H&H 416 next to me and when he shot he rattled my teeth.  I thought there was a earthquake.         Paul
FX Cyclone .22cal.6-24x44 Hawke scope  
HW97K .20cal.w/Elite 5x15x40 scope

Offline MEHavey

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Re: 100 Yard challenge/Cyclone
« Reply #33 on: February 25, 2009, 10:43:10 PM »

That .416 Rigby's muzzle blast may have rattled your teeth, but I guarentee it rattled more that that on the shooter's end.

 :-)

Offline erskine

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Re: 100 Yard challenge/Cyclone
« Reply #34 on: March 01, 2009, 01:32:56 PM »


Quote
MEHavey - 2/22/2009  9:17 PM  Sorry guys,... but wind has nothing to do w/ pellet drop, and Paul is correct.



Head winds will cause your pellet to fall short, tail winds will tend to keep it up. I understand that gravity is the primary influence here but anyone that has studied mil dot ranging on big bullets over very long ranges will understand that wind *does* have some influence.



Even a blind pig finds an acorn once in a while.
http://www.blindpig.org/micers/blog.html

Offline erskine

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RE: 100 Yard challenge/Cyclone
« Reply #35 on: March 01, 2009, 01:39:42 PM »


The BC that I have been using is 0.0323 for Crossman Premiers (14.3 gr .22). This is what I measured last year during mild weather at sea level. It is close enough for my poor shooting skills.



Scope height was at 1.5".



If you want me to run you a custom chart for your specific rifle, I can do that. I've done it for other's. If you have a chronograph, I can do a better job for you after you make a couple of measurements for me.







Even a blind pig finds an acorn once in a while.
http://www.blindpig.org/micers/blog.html

Offline PelletPaul

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Re: 100 Yard challenge/Cyclone
« Reply #36 on: March 01, 2009, 01:48:46 PM »
Thanks Mike.  So you can figure the exact BC of my pellet going through a Chrony?  I' am all ears.  Let me know what you want me to measure on my prochrony.
FX Cyclone .22cal.6-24x44 Hawke scope  
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Offline MEHavey

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Re: 100 Yard challenge/Cyclone
« Reply #37 on: March 01, 2009, 05:02:29 PM »
You have to set the chrony at different ranges, Paul, and measure the drop in velocity over those distances.  
The further apart the better, but make sure you have that famous "4-inch drop" measure correctly.  

Offline PelletPaul

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Re: 100 Yard challenge/Cyclone
« Reply #38 on: March 01, 2009, 09:31:28 PM »
So, if I zero at 25 yards then go 50 yards, that's a 2 1/2" drop.  Then to 60 yards?  Measuring velocity with the chrony?  My wife calls it the famous "6" drop.  HaHa
FX Cyclone .22cal.6-24x44 Hawke scope  
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Offline erskine

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Re: 100 Yard challenge/Cyclone
« Reply #39 on: March 05, 2009, 04:02:12 PM »


Quote
PelletPaul - 3/1/2009  9:48 PM  Thanks Mike.  So you can figure the exact BC of my pellet going through a Chrony?  I' am all ears.  Let me know what you want me to measure on my prochrony.





Yep, all you need to do is shoot a ten shot string at one distance and then a second ten shot string at any other distance. Probably ten and thirty yards would be best, if that is available. Just give me averages. The average velocity at ten yards and the average velocity at thirty. I can extrapolate the muzzle velocity from those numbers.



Also tell me what pellet you are shooting so I can put save that data.



Then I can calculate BC and generate you a ballistics chart for that pellet at that velocity.

Even a blind pig finds an acorn once in a while.
http://www.blindpig.org/micers/blog.html

Offline PelletPaul

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Re: 100 Yard challenge/Cyclone
« Reply #40 on: March 05, 2009, 09:50:16 PM »
Would 10 & 20 yards work?  My back yard is only 20 yards across.    Thanks  MIke
Paul
FX Cyclone .22cal.6-24x44 Hawke scope  
HW97K .20cal.w/Elite 5x15x40 scope

Offline erskine

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Re: 100 Yard challenge/Cyclone
« Reply #41 on: March 06, 2009, 03:09:09 PM »
Ten and twenty will work fine.
Even a blind pig finds an acorn once in a while.
http://www.blindpig.org/micers/blog.html