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long range shooting

 
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  #8  
Old 01-14-2003, 09:32 AM
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Join Date: May 2001
Location: Sask. Canada
Posts: 2,410
Re: long range shooting

S1,
Borrowing one of your terms, my "real world" hunting distance is out to 650-700 yards with my .308 rifles. Even at this more modest long range I have found that I am best served by shooting drops and using actual field measurements. I have large 2'x4' sheets of 1/2" steel plate that we paint white and can see bullet impacts very well on.
Your point about relative air density factors is a very valid one, we hunted 1500 feet above where we did all our zeros and one rifle's point of impact moved up 1.5 minutes. Resulted in a clean miss at 505 when he tried to spine a buck - hit about 7" higher than anticipated.
We had our data but blew it on that one, lesson learned. Re-zeroed and he broke a spine at 530 on a mulie buck.
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  #9  
Old 01-14-2003, 11:39 AM
 
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Re: long range shooting



[ 07-11-2003: Message edited by: S1 ]
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  #10  
Old 01-15-2003, 04:17 AM
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Join Date: Jun 2001
Location: Palmer, Alaska
Posts: 2,539
Re: long range shooting

S1,

I've done the same before, with only one sheet standing vertical using the 308's.
The "actual" drop is now measurable! If you take velocity readings the "actual" BC is now on the money too! The tracking problems will be elliminated like you said.

An easy way to get the "actual" BC of a bullet your working with, which helps. [img]images/icons/wink.gif[/img]
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  #11  
Old 01-15-2003, 09:41 AM
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Join Date: May 2001
Location: Sask. Canada
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Re: long range shooting

S1,
My partner and I did the exact same thing a while back, only our target stand was 12 1/2 feet tall by 3 feet wide and we shot in 100 yard increments from 100 to 700. Had to pile boulders on the base because of the wind, thing was pretty top-heavy but it sure worked well. Gave us very nice actual drop figures for the two rifles and loads before a hunt.

If we stay with a 100 yard zero we can catch our groups on the 12.5 foot stand out to 700 with most loads. Past 700 we use our big steel plates - 2'x4' is nice because we usually get more windage variations.
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  #12  
Old 01-15-2003, 09:50 AM
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Join Date: Mar 2002
Location: Tulsa Oklahoma
Posts: 73
Re: long range shooting

I do the reverse of that to verify bullet BC.
Find a calm day and get the rifle zeroed in at 600 yards (for instance). Being off a bit doesn't cause problems, just make sure your group is low enough that the 100 yard group will still be on paper. Then, just go in to 100 yards and take a couple of shots, making sure to use the same aiming point as further out. Do NOT change your scope windage or elevation adjustments. Measure the actual VERTICAL distance from center to center of the two groups and that gives you the actual amount of moa to get from 100 to the longer distance. Don't measure the center to center distance, measure the vertical difference between the group centers. If you have also chronographed those particular shots you have the necessary information to determine the actual average BC for that distance. Plug the info into the software and out pops an extremely accurate chart to give come-ups for intermediate distances.
Then all you have to do is verify the information at a few distances. At least for 1000 yards and closer, this has worked superbly for me.
This past weekend the projected 1000 yard scope setting was within 1/2 moa of the actual settings. First sighter was a 9 at 8 oclock with a new load. If I had gotten the windage correct it would have given me an X.

This method is also good to verify if you have enough vertical adjustment to get to whatever maximum yardage you intend to shoot. Have a tall piece of paper at 100 yards and put an aiming dot in the very bottom. Do one shot to verify 100 yard zero, then adjust the scope vertical 5 moa at a time. Take a shot each 5 moa. When the scope runs out of vertical take a shot and measure the vertical distance between the top and bottom holes and you will have the maximum vertical adjustment the rifle will do with the setup. Quite often the scope adjustment will turn further than the crosshairs will actually adjust for, which is the reason for a shot every 5 moa. That way you can know when the scope actually runs out of adjustment. I had a cheap tasco scope one time that would turn several full turns past the last actual adjustment and caused me problems because I expected it would get to 1000, but in actuality it would only get to 550.

[ 01-15-2003: Message edited by: Bruce Gordon ]
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  #13  
Old 01-15-2003, 01:41 PM
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Join Date: Jun 2001
Location: Palmer, Alaska
Posts: 2,539
Re: long range shooting

Bruce, I have a Leopold that the last 5moa is useless too...
I like the top of the plywood as a target, it makes a very clear line to hold from and the drop down from there is much more pronounced than the 600 yd zero gives because the bullets are impacting on the target on their way upto the max ordinate and on their way down too, easy to mix up groups and their closer together as well.

The 600 yrd group works out close to the bottom on a sheet of plywood depending on the cartridge used and groups are decending and easily kept track of too. I start by covering a sheet with two rows of frezer paper taped together, front and back, and stapled to the sheet. My 100yd zero is already established so I go to 200, 300, 400, 500 and 600, as fast as I can move and get setup again firing 3-5rds at each distance. Seeing the bullet holes in the freezer paper makes it much easier to plot velocities for each shot on a tablets target with relation to each round fired if you do this. Measure the groups center to center and you have it.

Do this at various temps, BP (and angles if an option) and you can develope super accrate drop charts and verify the accuracy of your programs modification of various temp, BP and angles too. If you use a crony doing it you'll have accurate velocities to input at the different temps as well, which will help you enormously.
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