270 & 130gr Sight in height. New Qtn

WhelanLad

WhelanLad

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Hey fellas, im about to pick up my Mossberger tomorrow and getting excited-

i'll be purchasing 2 boxes of Ammo to start off with, Yes the cheapest i can find- PPU 130gr
i wont really have Access to a Range so im goin to do all my sighting over in the DOC land (public land) back country once i walk in a few hours- i'll likely head to the same Hut i was in last weekend as im somewhat familiar with the terrain but enough of that-

I suspect most shots are going to be 200 PLUS and up to 400M on some of these Tahr, so im wondering if someone can punch in some details an come up with a fairly good Height to Sight the Rifle in at 100 Meters to allow foran average of 300m being backline hold on a Tahr sized animal- perhaps similiar sized to them big White mountain goats you guys have maybe slightly smaller-

22 inch barrel with a stated velocity of initially 3060--- so assuming around 3000 fps.

scope standard 1.5 inch above bore.



* have used the 270 alot and to 400 with slower (2850 fps) 130 corelokt reloads and also 130gr Vor-tx ammo (faster)

Im thinking 2.5 inches High at 100M- where might this sit me at 150- 200 - Zero? and at 300 , 350 and 400 going by the graphs and charts?

Thanks for the fast track trajectory info-

Legends.
 
You need to try it out. Anything else is speculation when it comes to longer ranges. TB posted a good thread about actual vs claimed velocity. Then you also have to consider actual vs claimed BC. Why can't you test at those ranges on DOC land?

I'd start around 2.5" high at 100, but definitely shoot at 300 and 400 to confirm.
 
Sight in 3" high at 100 yards, you'll be about the same at 200 and maybe a couple inches low at 300. At 325 which is very close to 300 meters expect to be around 4-5 inches low. That will get you on from zero to 300 meters on deer sized game or a good sized bull tahr with a center chest hold. At 400 yards or 366 meters plan for 13-14" of drop or top of the back hold. On the little females you'd be wise to do a little shading down or up as seems prudent. You have a range finder right?

There's no good substitute for shooting the actual distances; but three high will optimize whatever your ammo is really doing.
 
Dogleg said:
Sight in 3" high at 100 yards, you'll be about the same at 200 and maybe a couple inches low at 300. At 325 which is very close to 300 meters expect to be around 4-5 inches low. That will get you on from zero to 300 meters on deer sized game or a good sized bull tahr with a center chest hold. At 400 yards or 366 meters plan for 13-14" of drop or top of the back hold. On the little females you'd be wise to do a little shading down or up as seems prudent. You have a range finder right?

There's no good substitute for shooting the actual distances; but three high will optimize whatever your ammo is really doing.
Click to expand...

Thanks Dog Leg!
yep i upgraded range finder before coming over, one of those redfield 600s, i was picking up 500 no worries in the alps the other day - i wont be shootin past 400 an hopefully alot less distance-
thanks for the info, thats rough enough for me an close enough to give some idea to expect--

Cheers!
 
Actual data from my wife's .270 using 150gr Partitions at 2970fps

108 yards +2.9"
210 yards -1.0"
325 yards -9.0"
 
Dogleg said:
Sight in 3" high at 100 yards, you'll be about the same at 200 and maybe a couple inches low at 300. At 325 which is very close to 300 meters expect to be around 4-5 inches low. That will get you on from zero to 300 meters on deer sized game or a good sized bull tahr with a center chest hold. At 400 yards or 366 meters plan for 13-14" of drop or top of the back hold. On the little females you'd be wise to do a little shading down or up as seems prudent. You have a range finder right?

There's no good substitute for shooting the actual distances; but three high will optimize whatever your ammo is really doing.
Click to expand...

X2 own a rangefinder if you are shooting long range.
 
Rule of three. Or 3, 3 and 3.

Take a cartridge of about 3000 fps.

Sight in 3 inches high at 100 yards.

Shoot to about 300 yards.

That'll take care of most hunting situations and most calibers worth owning. Past that, its time to put a little work in.
 
Dogleg said:
Rule of three. Or 3, 3 and 3.

Take a cartridge of about 3000 fps.

Sight in 3 inches high at 100 yards.

Shoot to about 300 yards.

That'll take care of most hunting situations and most calibers worth owning. Past that, its time to put a little work in.
Click to expand...

Add the rule of "2's"... a cartridge with velocity in the mid-2000's fps, sighted 2" high at 100 yards, will be about 2" low at 200 yards... for 0-200 situations, you can disregard hold over/under with comfortable margins on all sides.

It's an "Eastern thing." đź‘Ť
 
stubblejumper said:
Except it isn't a caliber . To the OP, realize that you need to do your final sight in with the ammunition that you will hunt with, no just the same bullet weight, the exact same load.
Click to expand...

i understand for the exacts but a general rule of thumb does wonders in the mountains- all that will come i just want to be somewhat in the game straight away, ive done a bit with the 270 before and other cals to 400m and they are all within reason to each other, similiar to above mentioned rules... most end up around 15 inches low at 300 with a typical sight in but if i can lower than a bit from a higher sight in at 100 then im all for it, backline hold and hold over will finalise what ill need :)

a few ranges are open on weekends here at certain times which ill get into once ive been up and into the critters a few times!
cheers though, i do understand what ya saying
 
What yas Rekon is the Better RANGE to BORE SIGHT the Scope at to put it on Paper at 100m and save a few Crackers for the Animals!???

or wont it matter too much and just bore sight so the scope is on Target As is the Bore at 100meters when it comes time to Shoot and Sight-???

bit excited, my PLB/Epirb just turned up and i went an picked up my Ammo that i had put away until i could come an get it!!!
meaning ill be heading to the mountains on monday i rekon!
Thanks
 
I havent found that it makes much difference what range I bore-sight at. Usually i do it at 100 yards or meters, just out of convenience. Results are very mixed. Sometimes very little adjustment is needed to finish sighting in, and less frequently I'll miss the target altogether. I hate it when that happens.

In the long run, Im sure Id have saved frustration by first bore-sighting then taking the first shot at a very close distance that makes missing tbe whole target difficult. Our old club range used to have a 25 yard target for this purpose. Take the first shot, and with the rifle held motionless, walk tbe crosshairs to the bullet hole. That'll ball-park things quickly.
 
Dogleg said:
I havent found that it makes much difference what range I bore-sight at. Usually i do it at 100 yards or meters, just out of convenience. Results are very mixed. Sometimes very little adjustment is needed to finish sighting in, and less frequently I'll miss the target altogether. I hate it when that happens.

In the long run, Im sure Id have saved frustration by first bore-sighting then taking the first shot at a very close distance that makes missing tbe whole target difficult. Our old club range used to have a 25 yard target for this purpose. Take the first shot, and with the rifle held motionless, walk tbe crosshairs to the bullet hole. That'll ball-park things quickly.
Click to expand...

I appreciate your Comments Dogleg, an as usual this is why i come on CGN to seek info from the Gurus!

im a few days out from heading into the Alps with my Backpack, Tent and a bunch of foods... plb and Mossberger :D

im in that anxious stage but rightly so, more worried about heading into the bush with an unsighted rifle LOL! damn that feels weird!!
the bonus is i really have no time limit within the month, so i can just slowly walk in to the hut, unpack and then go about sighting and re gearing back up - perhaps lighter for shorter trips up to the tops and return a few days later, re cover then go again.... atleast thats the plan for now!

been a while in the making, been fairly well budgetted for it all- done a few last minute shopping today but i have all bases covered i think! fingers crossed i can return with some pics of some Tahrs------ if not, maybe next time :)


At 50m when attempting to sight in high at 100m, where is this projectile likely to Ballpark Land on the 50m target? il boresight at 100, an shoot one round at 50 to get a ballpark, then finalize sighting on 100m if its fairly aligned to be on paper at 50m

thanks
 
WhelanLad said:
I appreciate your Comments Dogleg, an as usual this is why i come on CGN to seek info from the Gurus!

im a few days out from heading into the Alps with my Backpack, Tent and a bunch of foods... plb and Mossberger :D

im in that anxious stage but rightly so, more worried about heading into the bush with an unsighted rifle LOL! damn that feels weird!!
the bonus is i really have no time limit within the month, so i can just slowly walk in to the hut, unpack and then go about sighting and re gearing back up - perhaps lighter for shorter trips up to the tops and return a few days later, re cover then go again.... atleast thats the plan for now!

been a while in the making, been fairly well budgetted for it all- done a few last minute shopping today but i have all bases covered i think! fingers crossed i can return with some pics of some Tahrs------ if not, maybe next time :)


At 50m when attempting to sight in high at 100m, where is this projectile likely to Ballpark Land on the 50m target? il boresight at 100, an shoot one round at 50 to get a ballpark, then finalize sighting on 100m if its fairly aligned to be on paper at 50m

thanks
Click to expand...

A bit over an inch high at 50m.
 
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