calling all 7mm rem mag owners and users

[kokanee83]

Decided to switch from .308 to 7mm rem mag. With the .308 i sighted in 1 1/2 inch high at 100 which gave me a pretty accurate shot up to roughly 300 yards. What i want to know is how high your sighting in yours and how far can you shoot without doing any drastic compinsation. I know it depends on the gun and quality and such. I bought a savage model 116 classic series.

[smith88]

Shooting a 150gr bullet with it zeroed at 200 yards, the bullet hits about 6 inches low at 300 and 18 at 400. Accurate shooting has less to do this the gun and more to do with the user.

[Tundra Monkey]

With the 7mm mag I'd look at zeroing it at 300yds but that's just me :)

tm

[BallCoeff.435]

Zero at 100 yards so you'll be good to go for any fast shots you'll get.

Anything substantially beyond that will involve setup time and careful deliberation, where you'll be able to dial in range and windage adjustments on your scope to be centered at 300 or 400 yards.

[equanuck]

Zero at 100 yards so you'll be good to go for any fast shots you'll get.

Anything substantially beyond that will involve setup time and careful deliberation, where you'll be able to dial in range and windage adjustments on your scope to be centered at 300 or 400 yards.

You're assuming the OP is using exterior dialing turrets... Zero for 200 / 300 yards and simply know where your shot will hit in between the barrel and the farthest distance he can shoot. Typical scope set up of 1.5" above center... 3/4" low at 50yd, 2 1/2" to 3 1/2" High at 100yd etc.

[BallCoeff.435]

You're assuming the OP is using exterior dialing turrets... Zero for 200 / 300 yards and simply know where your shot will hit in between the barrel and the farthest distance he can shoot. Typical scope set up of 1.5" above center... 3/4" low at 50yd, 2 1/2" to 3 1/2" High at 100yd etc.

The problem with that is even without adjustable turrets, the amount of compensation needed at longer distances than that zero'd at is much bigger. Also, the amount of that necessary compensation varies a lot depending on any particular range So, you're really limited in accuracy if you depend on point-blank range. If you set up for one distance, say 250 yards, it becomes a lottery to hit accurately at 'some other' farther range.

Better to zero short and use a calculated mil-dot range/windage/movement holdover according to distance, rather than have to rough guess what to hold under as well as hold over.

[Cowtown guy]

Ballistics Calculation for 250 yard zero with a 140 grain tsx bullet.


Input Variables Firearm type Long Sight Height 1.5
Bullet Weight (grains) 140 Ballistic Coefficient .394
Muzzle Velocity (fps) 3200 Temperature 59
Barometric Pressure (hg) 29.53 Relative Humidity 78%
Zero Range (yards) 250 Wind Speed (mph) 10



Ballistics Table in Yards 140 tsx 140 gr., .394 B.C. www.hornady.com

Range (yards) Muzzle 100 200 300 400 500 600 700 800 900 1000
Velocity (fps) 3200 2949 2712 2487 2274 2070 1878 1698 1532 1383 1254
Energy (ft.-lb.) 3183 2704 2287 1923 1607 1332 1096 896 729 594 489
Trajectory (250 yd. zero) -1.5 2.2 1.9 -3.1 -13.8 -31.2 -56.7 -92.1 -139.7 -202.2 -283.1 Wind Drift (inches) 0.0 0.6 2.8 6.6 12.2 20.1 30.4 43.4 59.7 79.5 103.2
Come Up in MOA -1.5 -2.1 -0.9 1.0 3.3 6.0 9.0 12.6 16.7 21.5 27.0
Wind Drift (moa) 0.00 0.62 1.33 2.09 2.92 3.83 4.83 5.93 7.13 8.44 9.85

This is what I use. Assuming that a deer is 16 to 18 inches deep thru the chest, you can hold on hair to 400 yards.

This chart has been shot to confirm the poi and it is as close as you could get. The only deviation is probably my shooting.

[Cowtown guy]

The problem with that is even without adjustable turrets, the amount of compensation needed at longer distances than that zero'd at is much bigger. Also, the amount of that necessary compensation varies a lot depending on any particular range So, you're really limited in accuracy if you depend on point-blank range. If you set up for one distance, say 250 yards, it becomes a lottery to hit accurately at 'some other' farther range.

Better to zero short and use a calculated mil-dot range/windage/movement holdover according to distance, rather than have to rough guess what to hold under as well as hold over.

I don't get it. What farther range are we talking about?

By zeroing at 250 I am only 3 inches low at 300 and can hold on hair out to 400 yards with only a 13 inch drop. That is way farther than 90% of shooters will ever hunt or shoot. I know that this works. I have been using it for 5 years.

[bessiedog]

i just hunted a full season with my savage 110 in 7 mmrmag.

It was a breeze to zero in at 250 yards. Ill probably never chance a shot out to 400. But its nice to know i have theoption.

I was shooting 162 hornadys off the shelf.

Cant wait for next season.

[kokanee83]

Alright so im not using turrets or any rest other than whats avail out in the bush. I ask cause i have recently switched from forest hunting on crown to farmland hunting on privite i enjoy it more. For those who do prairie hunting you know those long range shots are more common. I am using 140 grain bullets. So after reading the posts i think im gonna sight in zero a 250.

[Andrzej]

I set most of my rifles at 3" high at 100 yards and this in 7 Rem Mag 140 gr translate to about 3" high at200 and 3" low at 300 no need to change point of aim for most shots.
Make sure that you confirm Point of Impact at those distances as published velocities for 7 mm Rem Mag from the box are about 200 ft/sec to high for average gun.


Andrew

[sns2]

Zero for 200 yards. If the animal is 400 yards holding at the top of the shoulder and you are normally in business. Has worked for me for two decades. Make sure you know where your gun hits at 300 and 400 yards off the bench. That's my advice, but do what works for you. I would encourage you to get a good set of shooting sticks and a rangefinder. Congrats on your new rifle and choice of caliber.

[pintailslammer]

I sight mine in for 1.5-2' high at 100yrds. I'm shooting 140 gr Nosler Accubonds with 63.5 gr of H4831sc. It is a great load in my Browning with a 26" barrrell


Pin

[PoppaW]

It's simple. Figure out with years of practice what works for you. As you can see there is a variety of ways to dial in your gun. I have used the 3" high at 100 for years on flat shooting guns and just recently am trying a ballistic reticle and a 100yd zero. So far I don't like it but will give it a fair shake for a few more years. It may grow on me.

[TUFFBUFF]

The 7 mag is my only hunting rifle - 2.5 high @ 100, 160 grain bullets good to 325 or so. Works for me

[SHORTMAG]

All my hunting rifles 300WSM, 6.5x55, 270 Win, 243, and my 7MM Rem Mag....always sighted in 3" high @ 100 yds...that will allow you the MPR(maximum point blank range) no holdover out to about 350 yards or so...give or take a few.... Once you know your loads MV and your bullets BC...you can pinpoint it a bit closer for each individual caliber.