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Sighting in question

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/27/2008 at 20:33
tomp View Drop Down
Optics GrassHopper
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Joined: August/26/2008
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I am new to this forum so I am many different questions on different subjects.  I hope you guys don't mind my newbie questions.
 
Like most of us, I got my early gun and hunting information from my dad.  My Dad gave me a Winchester Model 70 .270 pre 64 rifle when I was 15 years old and that was 30 years ago.   It has been the only hunting rifle I have ever owned and it has suite me well for my 100-200 yard California deer shots.   When I was a kid my dad taught me to sigth in my .270 1" high at 100 yards.  I never questioned Dad and continue to do this to this day.  Whether or this is correct or incorrect info I dont know.  I now have my own two sons and have given them the same info that my Dad gave me.  It occurred to me that I should check with you guys and see if this is good scoop for my kids or if this theory has changed over the years.    Let me have it guys. 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/27/2008 at 21:05
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I'm not familiar with the 270s trajectory, but I would guess that 1" high at 100yds would give you an actuall zero (the point where the bullit intersects with the line of sight) somewhere between 200-300yds. Meaning you could shoot a target out to 300yds with this zero and be just a couple of inches off high or low from  your point of aim (POA) in theory.
Again I do not know the trajectory of the 270 so the numbers given above are just guesses.
If you have access to a 300yd range, set up a target at 200 and 300yds and shoot some 5 round groups on each and see where they group in reference to your POA. Then imagine the vital area of the game you are hunting and where those shots may be (was it a clean kill).
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/27/2008 at 21:30
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Optics Master Extraordinaire
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 270 Winchester Trajectory and Hunting Applications.
 This is a down range trajectory chart for the 270 winchester cartridge with the scope mounted 1.5 inches above the bore center line plus if you were using this load, its effective hunting bullet energy range with well placed shots on,
Varmint / Predator size game, such as Bobcat, Cougar, Coyote.
Deer size game, such as Antelope, Blacktail, Hogs, Javelina, Mule, Whitetail.
Elk size game, such as Caribou, Black Bear, Sheep.
Moose size game, such as Brown Bear.
Bullet diameter .277"
Bullet weight 130 grains
Bullet ballistic coeffecient .392
Bullet velocity 3,100 feet per second
Range
100 yds.
200 yds.
300 yds.
400 yds.
500 yds.
+
+ 1.5
0
- 6.6
- 19.6
- 40.0
2341
1962
1635
1355
1118
Might help..fairly typical trajectory for 130gr 270 round ( Pyro's favorite )
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/27/2008 at 21:41
RifleDude View Drop Down
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Your dad gave you good advice, except I would change that zero to between 1.5" - 2" high @ 100 to allow you to shoot out to a little beyond 300 yards without holdover.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/27/2008 at 22:23
pyro6999 View Drop Down
Optics Retard
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OT TITAN

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i always used 2" @ 100yds when i lived in wyoming with my 300win mag and my 30-06 also at 500yd i had to hold about 16-20" high to hit my target. now that i live in flatlander territory i went to dead on at 100 since most of my shots are inside of 100yds
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/27/2008 at 22:30
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Optics Jedi Knight
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I sight mine in closer to 2.5" high at 100 yards.  The max height it reaches is 3.1 at 150 yards, zeroed at 275 and 1.5" low at 300.  Then at 400 all you have to do is hold on or just above the back.  Works well for my 270.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/27/2008 at 22:51
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ROLL TIDE ROLL

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with a 150 nosler partition with a scope height of 1.5 inches.  Remington shoot ballistics software says 2.53 inches at 100yrds give you the optimized load for 235yrd zero and a point blank of 277yrds.  So it really depends on the bullet your shooting.  Remington shoot is freeware do a search and download for yourself.

  Mike
 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/28/2008 at 11:42
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GOOGLE NINJA

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Originally posted by tomp tomp wrote:

I am new to this forum so I am many different questions on different subjects.  I hope you guys don't mind my newbie questions.
 
Like most of us, I got my early gun and hunting information from my dad.  My Dad gave me a Winchester Model 70 .270 pre 64 rifle when I was 15 years old and that was 30 years ago.   It has been the only hunting rifle I have ever owned and it has suite me well for my 100-200 yard California deer shots.   When I was a kid my dad taught me to sigth in my .270 1" high at 100 yards.  I never questioned Dad and continue to do this to this day.  Whether or this is correct or incorrect info I dont know.  I now have my own two sons and have given them the same info that my Dad gave me.  It occurred to me that I should check with you guys and see if this is good scoop for my kids or if this theory has changed over the years.    Let me have it guys. 
.........................Assuming you don`t have a 300 yard range, the most accurate  way to sight your rifle in at 100 yards for a 300 yard zero for hunting is;
 
Determine your bullet`s BC.
Chrony your reloads.
 
Use an external ballistics calculator (like on the Hornady site) by simply typing in all the info to then determine the flight trajectory at the various distances.
 
Doing it that way will be more precise and besides, you should have a chrony anyway because they are not only fun, but you should also determine the individual performance coming from your rifle.Wink 
 
 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/30/2008 at 07:43
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Optics GrassHopper
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 Much depends on the cover you hunt and your average shot. My average deer shot is about 50-75Yrds. I don't think I've ever taken a 200 yrd deer shot in many years of hunting. 1" high at 100 yrds for your hunting sounds fine, that should work from 50-200+yrds. Of course practice at the ranges you could expect a shot opportunity.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/30/2008 at 10:44
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Originally posted by tomp tomp wrote:

I am new to this forum so I am many different questions on different subjects.  I hope you guys don't mind my newbie questions.
 
Like most of us, I got my early gun and hunting information from my dad.  My Dad gave me a Winchester Model 70 .270 pre 64 rifle when I was 15 years old and that was 30 years ago.   It has been the only hunting rifle I have ever owned and it has suite me well for my 100-200 yard California deer shots.   When I was a kid my dad taught me to sigth in my .270 1" high at 100 yards.  I never questioned Dad and continue to do this to this day.  Whether or this is correct or incorrect info I dont know.  I now have my own two sons and have given them the same info that my Dad gave me.  It occurred to me that I should check with you guys and see if this is good scoop for my kids or if this theory has changed over the years.    Let me have it guys. 
 
 
 
Everyone has covered the options you have very well if you are interested in increasing your range. I, like you have hunted with a 270 for many years and have little interest in anything else. If you are using factory ammo 130 gr. and know you have little need for greater range then don't change a thing. The same for 150 gr ammo unless you do have the occassional 300yd. shot then a 1.5 zero would be a plus for either weight. I imagine your hunt success is so well established by now that making any change is really not neccessary for you. But for your sons you can add a new perspective in the joy of shooting and hunting by showing them the real ability and potential of todays hunting rifles. I know from expereince that the 270 is well able to take deer sized game at 500+ yds. with power to spare, so don't under estimate it's potential. Another thing that would help you and your sons shooting confidence is to shoot as much as you can with a scoped 22 or any thing that is similar to you hunting rifle. And also get some experience with shooting atleast 100yds. beyond your average hunting shot. That way the average shot is no longer a challenge and on the rare occassion that you have a long shot your not guessing about where to aim. Good Luck! And welcome th the OT. Oh! and thanks for teaching you sons how its done.
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