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  #1  
Old 10-30-2008, 07:33 AM
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7mm Rem Mag Bullet Drop


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I recently purchased a Rmington Model 700 BDL in 7mm Rem Mag. I was sighting it in the other day and put it dead on at 100yrds. Being happy with the zero being at 100yrds I took the gun back home and put it away. I watched a hunting show a few days later and they were talking about bullet drop/hold over and such and I decided to see how the 7mm Mag dropped from 100yrds to 200rds. I went back to the range and set up a target at 197yrds (this is as far as the shooting lane extends) and fired a few shots. The ballistics chart I had said it should drop 2.5" at 200yrds but it only dropped 5/8". Can anyone explain this? Why would my rifle not perform the same as the ballistics chart for the brand and weight of bullet im shooting? Not that im complaining but it puzzles me. Anyone have any ideas? Thanks in advance for your input.
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  #2  
Old 10-30-2008, 07:46 AM
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What is the drop at 100 yards?

I found this chart which looks like the drop from 100 to 200 for 7mm mag should be between 1.1" and 1.4"

http://www.hornady.com/images/ballis...ics_charts.pdf

Last edited by savage_shawn; 10-30-2008 at 07:53 AM.
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  #3  
Old 10-30-2008, 07:51 AM
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The rifle is sighted in to be dead on at 100yrds.
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  #4  
Old 10-30-2008, 08:59 AM
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If your scope is mounted pretty high on the receiver and you're using light weight bullets (120 - 150 grain), you won't experience much of a drop at those ranges.
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  #5  
Old 10-30-2008, 09:16 AM
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Results from firing the same ammo in two different rifles can vary wildly. Assuming that velocities are very close, there are still any number of variables that could cause the difference you cite. One that immediately comes to mind is scope height above the boreline. If one rifle has low rings, and one has high rings, their trajectories will be different.
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  #6  
Old 10-30-2008, 09:36 AM
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You may not be taking into account that your line of sight with a scope mounted starts out 1 and 1/2 inchs above the bore line. Most folks sight a rifle in so that they maximize the cartridges potential. Usually that means 2.5 to 3 inchs high at a hundred yards.

For the 7mm Rem mag sighted in like that it means that between zero yards and 325 yards you can hold on to the center of a deers chest and be assured of a killing shot without worrying if the bullet will strike high or low.

That's the way all my big game rifles are sighted in. The Varmint rifles which have to work with a smaller target are sighted in 1.5 inches high at a hundred yards. Never seen the reason to not take advantage of any rifles ballistic capability. I shoot an 8mm Rem mag and a 280 Remington for big game.
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  #7  
Old 10-30-2008, 10:11 AM
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Talking

maybe the gravity is weaker in tennessee?
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  #8  
Old 10-30-2008, 02:34 PM
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Thanks guys. My scope is mounted on see-thru bases so that I can still use my iron sights (or that was the intent, the scope is blocking them still) and I never thought about that affecting my drop at certain ranges.
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  #9  
Old 10-30-2008, 02:59 PM
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My advice would be to get rid of the see through mounts. The fastest and best rifle sight on the market is a good properly mounted scope, and it will make life much easier to calculate.

It's true, big dan; I have seen gusts of gravity do all sorts of things to my bullets. It's the only possible explanation I have for some of the things I've done.
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  #10  
Old 10-30-2008, 05:50 PM
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yep! it does some funky things with my groups from time to time.
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  #11  
Old 10-30-2008, 08:24 PM
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I tried the shorter mounts after i realized that my scope covered my iron sight but then with the short mounts the end of the scope hit the base of the iron sight so i put the tall ones back on. It feels better to me with the tall ones anyway. I would like to and plan to eventually find a place to shoot past 200yrds and see what the bullet drop is so I can write it down and have it as a reference. But until then ill just have to go by the results at 100 and 200yrds.
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  #12  
Old 10-30-2008, 09:09 PM
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Take the iron sights right off.

I have several rifles that have never had an iron sight on them. That will allow the scope to be mounted low enough to be much more effective; your head will be in much better position on the stock; you will shoot better from the bench; you will shoot much better in the field and you will find target acquisition much faster with the scope lower.

Iron sights are appropriate for some guns, and for some circumstances, but not many. Don't make any effort to keep them on a gun that is better suited to a good scope, especially if they are in your way.
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  #13  
Old 10-31-2008, 11:01 AM
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Since the high mounts work better for him. I would do as he suggests in seeking a longer distance, say 300 yards or so, to shoot at and see where his impact point is with is present zero and adjust to his liking accordingly.
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  #14  
Old 10-31-2008, 12:51 PM
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IF you give us the bullet weight, manufacturer, muzzle velocity and height of your scope (centerline) above the centerline of your barrel, it's simple to calculate the trajectory.

I did a calc for a 150 gr Sierra Game King BT @ 3110 fps, assuming your scope is 2.5" above the barrel center. FOr a 100 yard zero, the 200 yard POI would be -1.6". Lighter, faster bullets would have less drop.
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  #15  
Old 10-31-2008, 07:01 PM
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You should check your real point of impact at different ranges yourself. Charts are a good reference to compare loads but actual performance may be different. With the high see through mounts the bullet is still going up at 100 yards and has dropped just a little at 200. Probably a good zero. I would check to see where it hits at 150 and 300. And at 50.
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  #16  
Old 11-01-2008, 03:32 AM
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My .308 never seems to exactly match the charts either. I just chaulk it up to case capacity and a little plus or minus on the velocities.
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  #17  
Old 10-25-2009, 08:29 AM
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Quote:
Originally Posted by Saskshooter View Post
Take the iron sights right off.

I have several rifles that have never had an iron sight on them. That will allow the scope to be mounted low enough to be much more effective; your head will be in much better position on the stock; you will shoot better from the bench; you will shoot much better in the field and you will find target acquisition much faster with the scope lower.

Iron sights are appropriate for some guns, and for some circumstances, but not many. Don't make any effort to keep them on a gun that is better suited to a good scope, especially if they are in your way.
remove the sights I wont buy a rifle with them. a lever gun that is a diffrent story
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  #18  
Old 10-25-2009, 03:08 PM
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I have found that different charts will sometimes give a little different info. I shot a seven mag for years.I shot 150gr.winchester ballistic tips and sighted the rifle in at 200 yards.For hunting use i was able to put the crosshairs on anything from 100 too 400 yards and hit my target.some rifles may shoot different but that is what i found worked the best for me.
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  #19  
Old 10-26-2009, 01:02 AM
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every thing drops to mother earth @16'/sec per sec ?-doesn't matter what you shoot it out of.
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