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140g NBT @ 800 yards

 
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  #8  
Old 02-02-2007, 02:37 PM
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Re: 140g NBT @ 800 yards

That is a very good point MagMan. Most scopes are not a true MOA to click ratio. If it is a .250 MOA/click scope your bullet should have dropped 123.5" at 800 yards with the info you provided. If the value was in reality .200/click, this would give you 74 clicks to hit your target instead of 59 clicks.

Good job MagMan!

As was stated, a dead zero at 100 yards and 80 clicks will give you 20.94" of differance IF it is truly .25 MOA/click. If it is .200 MOA/click it iwll be 16.75" of differance.

Bear in mind that this issue could still be a combination of problems like a faulty click value and faulty chrony.

Please, let us know.
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Old 02-02-2007, 02:54 PM
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Re: 140g NBT @ 800 yards

On a side note:

If you ever want to test any scope as to its real MOA/click ratio, you can use this simple formula.

Inches bullets moved from zero / number of clicks / 1.047 / (zero range/100) The answer is EXACT MOA/click values and can be done with any scope.

This formula works for any zero and any number of clicks used, although, more clicks are better for a good average.
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Old 02-02-2007, 07:41 PM
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Re: 140g NBT @ 800 yards

Alright guys, heres a quick update. I think I know whats wrong now [img]/ubbthreads/images/graemlins/mad.gif[/img] First things first was to zero at 100, I was zeroed at 200, so I just went 5 clicks low and shot at 100. I was still a tad high, moved down 2 clicks, shot was zeroed at 100 yards. Crony was reading a slow 3215fps average today [img]/ubbthreads/images/graemlins/confused.gif[/img] I took the advice and dialed 20 MOA or 80 clicks up and shot 2 times to see where I was hitting at 100 yards. I was right at 20 1/4" high, so obviously my scope is not the problem here..The next thing I did was check my drops as recomended. Zeroed at 100, should put me 20" low at 400. Well I shot 3 shot group and to my surprise was 1.5" [img]/ubbthreads/images/graemlins/grin.gif[/img] but was -23". So me thinking my Cronygraph is off here. I plugged everything in, if my bullets BC is around .485, then based on my drops at 400, I'm only running around 3075fps instead of 3250fps. 3075fps matches up a lot better at 400 and 800, according to what my clicks and load are doing anyways. I think I need a new cronograph, what do you all think???
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Old 02-02-2007, 07:54 PM
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Re: 140g NBT @ 800 yards

Do you know anybody close to where you are to barrow one before you buy??
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  #12  
Old 02-02-2007, 08:07 PM
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Re: 140g NBT @ 800 yards

i've never cared what the speed was or BC. just shoot it and see how many clicks it takes your scope to make it hit where you want.that's very reliable.
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Old 02-02-2007, 08:36 PM
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Re: 140g NBT @ 800 yards

Rem I was not trying to be a jerk I was just stating that a 7mm Rm is not going to get that kinda velocity. If you have a 30inch pipe maybe. I have the Nosler book also and I would really like Nosler show me in person they are getting 3300fps with a 140 and the rifle is still in one piece. [img]/ubbthreads/images/graemlins/smile.gif[/img] They are dreaming that is as fast as a STW will shoot and that is not going to happen. That is why I dumped the 7 RM and got a STW. I have the same chrony you do I also have two others. I can tell you that your graph is probably lying to you. I have had mine give me a reading one day and then the very next day with about the same conditions out give me a reading up to 100fps + or -. I have noticed it really does not seem to work well after the summer months I think it has to do with the sun not being as bright. I do not know what you are shooting for a rig but if you have a factory rifle with a 26inch pipe and can get more then 3150fps without pressure signs I would hold on to it. That is why when I was shooting any of the 5 7mm mags I had I went with 160gr bullets because I could shoot them around 3000fps and was only getting around 3100fps with 140's. Really does not make sense but that is how it worked out. One of them even had a Hart 27inch tube. If you do not like the 140 shooting that speed try a 160gr or more.
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  #14  
Old 02-02-2007, 08:49 PM
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Re: 140g NBT @ 800 yards

I dont know anyone with a cronograph around here, seems I'm the only one who thinks ya need one [img]/ubbthreads/images/graemlins/smile.gif[/img] I dont know, I'm kinda dissappointed. I really like the 140g BT, it shoots great, just wished I knew what the real deal was. I'm still betting its the cronograph. So whats a decent cronograph that wont cost me an arm and a leg??

Dave- I agree to an extent. Theres no other sure way to know what your bullets are doing until you shoot them, but it would take forever to drop test and confirm zero'es every 25 yards, etc. Just seems like it woudl be tedious (sp?) work. I get frustrated to easily, might be part of my problem..
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