Back to the basics:sighting in

[model 70]

ok, this i may need some help on. the goal is finding the ammo my gun will shoot the best for deer hunting.

pick one type of ammo at first. sight in at the 100 yard mark. fire a 3 or 5 shot grouping. after the first shot, see where your bullets hits. up and to the left? no problem. when you fire off your 3 or 5 shot group and notice all the holes are touching(i could only be so lucky:D ) adjust "up" or "down", left to right until you can land all your 3 or 5 shots in the middle(or where ever you're aming).

is that about right?

[Evan03]

ive been useing 1" orange dots at 100yds to bore site to save on ammo.

i bore site. by looking through the barrel at the dot then adjust the scope to the dot.

i then fire one shot at 20yds to make certain its close enough to step back and shoot from 100yds.

by useing this method ive knocked the amount of ammo in half and sometimes considerably more when siteing in.

sometimes as fast as 5 rds to have the rifle sited in.

i also shoot at targets with 1" square backgrounds. this way i can tell how much i need to adjust just by looking at what square the bullet landed in. this saves time and is more precise than guestimateing how high or hoiw far left your impacting at 100yds.

i used to only adjust horizontal or vertical in one sitting. if i was shoot4"s low id adjust vertical. shot a few rds to make sure its on then adjust my 2"s left to be where i want it.

now i fire 2rds after bore siting and do all adjustments from there right to where i want to be. although i havent always had good scopes that could handle that. ive adjusted as much as a foot vertical and just as far horizontal after the 2 rds at 100 and came out dead on where i wanted to be.

ill give leupold credit on that.

good thread

Evan

[Adirondacks]

Sounds right but if the goal is to find
the best ammo for your gun I wouldn't
worry to much about the adjusting
up or down till you run through all
the candidate ammo. Once you are
on the paper I'd shoot a group of
three or so with a couple different
brands and weights to see which
groups best. Remember to try the
different bullet weights for the calibre
that you are using. It often is this
that the rifle will be the most finickey
about.

With a hunting weight barrel I wouldn't
shoot to many because you are probubly gonna start stringing
shots because of
the barrel getting hot.

Once you settle on the best brand then
just go slow. Shoot a few shots each
trip to the range (maybe 10 total) and
fine tune it. Make about 8 or 10 trips
to the range doing this each time and
walking the distance out each time and
you'll get it right on.

Remember to check out the point blank
range of whatever calibre you are
shooting. For most deer rounds you will
want to be about an inch high at 100
yards.

[model 70]

ok, in .270win and an inch high at 100yds, where abouts will i be hitting at say...10-30yds?

[BILLY D.]

according to hoyle you should be in the center of the bullseye at 25 yds, buuuuuuuuuuut, that doesn't always hold true. depends on ammo, firearm. if you sight in at 25 and hit center bull the worst outcome is you maybe will be a little high, low, left or right but at least you will be on paper at 100.

one other question, are you using a scope or iron sights?

[model 70]

scope, 3x9x40mm

[Adirondacks]

Originally posted by model 70
ok, in .270win and an inch high at 100yds, where abouts will i be hitting at say...10-30yds?

Exactly. For most hunting rounds around
just shy of 3000 feet per second at the
barrel. Dead on at 25 yards is about
an inch high at 100. It will usually be
cross line of sight again mid to high
200's and be 4 inches low depending on
the round at somewhere around 300 yds.

The goal is to get a trajectory that never
goes above 4 inches over line of sight.
4 inches being the vital zone of a deer
size game animal. This means that out to
reasonable distances you can aim dead
on and hit the vitals of the animal. No
adjusting for drop is needed.

[Rocky Raab]

Not to pick nits, but it does depend on the scope's height above the bore.

If the scope center is about 1.5 inches above the bore center, MOST deer calibers will shoot to cross the line of sight at 20-25 yards, be somewhere near center at 100 yards, and cross the line of sight again (dropping) at 225 or so.

Note the qualifiers "most", "about" and "somewhere". Dozens of factors affect trajectory, so precise predictions are impossible. Every shooter has to determine how his gun shoots with his ammo (and in one condition of weather, off one rest, at one altitude and so forth...)

BUT: if most shooters would sight their standard deer rifles to hit 2.5 inches high at 100 yards, they could "aim at hair, never air" for 99% of all shots at deer.

[Evan03]

this is remington 130gr core lokt factory ammo, info is right off remingtons website. test barrel lenght is 24". the industry norm im going to say is a test barrel of 24"s in standerd calibers. this is with glass center line 1.5"s above line of sight.

muzzle velocity is3060 energy2702 500yds/1801fps, energy/936

100yds + 1.5"
150 + 1.4"
200 zero
250 -2.8"
300 -7"
400 -20.9"
500 -43.3"