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Actual B.C.

 
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  #8  
Old 02-14-2007, 09:50 AM
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Re: Actual B.C.

My thoughts on it are this:

6.5-WWH cartridge is hard enough on barrels that your bc will be degrading with just about every box of bullets you buy so no matter how accurate your starting bc is that you give to Leupold, it will not stay that way for long. Then throw in a half mark (like 725 yards) then a little angle, then an unexpected elevation change, and your little tidy mark on the turret is suddenly WAY off.

If you can't already tell, I am very much anti BDC and anti holdover dot for long range hunting. [img]/ubbthreads/images/graemlins/shocked.gif[/img] [img]/ubbthreads/images/graemlins/frown.gif[/img] Yes, they might work for mid range, but I absolutely positively guarantee you that you will be let down hard eventually at long range with either of these systems. People who disagree with me on this one have either not had the let down happen yet or have not shot at a big game animal past 800 yards.

Do yourself a favor. Learn MOA and IPHY and use real world input data from your current hunting situation. Then dial your scope in MOA (or IPHY) for your current bc. It will be simple, you will still be dialing to a number, it's just that the number represents a different thing. And best of all, if you learn MOA, you can transfer this techinque to all your guns because their scopes are all set up in this manner.

Sorry John. [img]/ubbthreads/images/graemlins/frown.gif[/img]
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  #9  
Old 02-14-2007, 11:12 AM
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Re: Actual B.C.

[ QUOTE ]
and your little tidy mark on the turret is suddenly WAY off.


[/ QUOTE ]

That is why I dont use pre-set marks on my turrets. For me, every hunting situation is differant. Differant inclines, atmosperic conditions and differant altitudes. I calculate each shot for what it is and adjust accordingly. However, if my ballistics program tells me that it just so happens to be that for my 875 yard shot I need 8.0 or 8.1 bars on my NP-R2 reticle to hit my target for this particular set of circumstances, I will use my 8th bar instead of clicking my way to zero. If it isnt very close to a whole number, I will go ahead and come up in MOA on my turret.
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Originally Posted by Broz View Post
Please just answer one very simple question. Why would anyone shooting long range load a low BC , low SD 168 gr offering in a 300 win???????

My answer to this is. The only reason is to make the 7 RM look good. There is no other reason.

Jeff.
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  #10  
Old 02-14-2007, 12:55 PM
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Re: Actual B.C.

Thanks Good Grouper and I can appreciate what you are telling me. Do I understand you right, due to barrel erosion, velocities change. This then changes the B.C. Therefore, the BDC values will be wrong as the barrels wears? The same thing will happen to my drop chart also, but it is easier to correct, right? How accurate do you guys find the computer generated drop charts to be? How do I go about making one?

What do you think my barrel life will be running 140 gr. bullets at 3350-3400?

Hank
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  #11  
Old 02-14-2007, 04:57 PM
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Re: Actual B.C.

I know I am not GG, but yes, velocity can change due due barrel wear. Also due to barrel wear the engraving on the bullet changes which can change the BC also. Both velocity differances and less quality engravings change the BC. Both together and alone. Now we are talking about minor changes here. You wouldnt notice much differance out to 600 yards.
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Quote:
Originally Posted by Broz View Post
Please just answer one very simple question. Why would anyone shooting long range load a low BC , low SD 168 gr offering in a 300 win???????

My answer to this is. The only reason is to make the 7 RM look good. There is no other reason.

Jeff.
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  #12  
Old 02-14-2007, 05:28 PM
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Join Date: Sep 2004
Location: on the rifle range in Utah
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Re: Actual B.C.

[ QUOTE ]
Do I understand you right, due to barrel erosion, velocities change.

[/ QUOTE ]


Yes. They can either increase or decrease.


[ QUOTE ]
This then changes the B.C.

[/ QUOTE ]

Yes, but only slightly. The main thing is that the bc changes because of the wear.


[ QUOTE ]
Therefore, the BDC values will be wrong as the barrels wears?

[/ QUOTE ]

Yes, absolutely.



[ QUOTE ]
The same thing will happen to my drop chart also, but it is easier to correct, right?

[/ QUOTE ]

Yes. You will constantly be checking your bc values and will run your charts or PDA program accordingly on the hunt or within days of being on it. So it is much easier to hit "calculate" on your program or print a new page off your home pc then it is to have a new turret cap engraved.




[ QUOTE ]
How accurate do you guys find the computer generated drop charts to be?

[/ QUOTE ]

Programs are only as accurate as the data they are given to compute. The more you know about where you are and what the conditions are, the more accurate the program will be. Given the right information, most programs will predict where your bullet will be in it's trajectory to the 1/2" as far out as you want to know.




[ QUOTE ]
How do I go about making one?



[/ QUOTE ]

Get yourself a copy of Exbal, run the drops in IPHY, and then make sure you have a good printer.




[ QUOTE ]
What do you think my barrel life will be running 140 gr. bullets at 3350-3400?



[/ QUOTE ]

For what size target? You will probably still hit the side of an F350 at 1000 yards after 1500 rounds, but you might not be able to dust a p-dog at 1000 yards after 500 rounds.

A buddy of mine has a 6.5 wsm (which is smaller than your case) and just had it borescoped the other day and it looked like a dry lake bed 6 inches down the bore from the chamber and he has less than 500 rounds down it. Now, it still shoots ok, but it is getting noticeably harder to clean and it is now blowing up every bullet he shoots except for the 142 grain Sierra MK. They have a tougher jacket than the Bergers and Amax.

And the MK's no longer use the same chart he started with!


Eventually, when your barrel does not give you the accuracy you want and is a #$%*@ to clean, you can run a Tubb's barrel maintenance kit through it and revive it for ahwile but in the meantime, you would have gone through about a dozen BDC knobs trying to keep up with your ever-changing barrel.
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