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Novice: 7RM out to 600 yds.

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  #8  
Unread 06-28-2009, 08:34 PM
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Re: Novice: 7RM out to 600 yds.




This is a software chart from my ballistics/ reloading software program on the load I commonly use for my 7mm Mag. The powder is Reloader #25 @ 70 grains. If you wanted to try it I'd suggest starting out at 66.0 grains and working up to the 70 grain point in 3 tenth of a grain increments. Settle for the one that performs the best out of YOUR rifle. Do not go past the 70.0 grain load factor as it is very close to the MAXIMUM pressure allowed for this caliber.
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  #9  
Unread 06-28-2009, 09:55 PM
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Re: Novice: 7RM out to 600 yds.

Thanks for the help guys I appreciate your help...Bullet selection that will be good up-close and out to 600 yds for deer/hogs is proving to be a bit more challenging than I originally thought...Really appreciate you guys sharing!

For what I'm asking what type of BC should I be the magic number?
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  #10  
Unread 06-28-2009, 10:23 PM
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Re: Novice: 7RM out to 600 yds.

Welcome to the site,

You have been given A-1 advice so far. I'll re-iterate most of the previous info as well as add some additional info.

I've been shooting the 7RM since 1978.

I've shot tons of different combinations of bullets/powders. I shot the Hornady 154gr flatbase bullets for a LONG time. I killed Mule deer past 700yds with it. It never failed to perform, it is also a very in-expensive bullet. At around $30/100 it is a steal for practice and is very workable as a hunting bullet.

I used to use H4831 for the 7RM, but have recently had exceptionally good results using RL-22 and it is now my go to powder for the 7RM.

For hunting, I also use the 160gr Nosler Accubond for most things. The 162gr A-Max shoots to nearly the same point of impact with the exact same powder in my rifle. I load them both to just over 3000fps (3015fps average actually).

I have found my best luck using non-magnum primers (currently use Rem 9 1/2 primers). My rifle will shoot around .25moa out to 200yds and sub 1/2moa out to 800yds when I do my part with both the Accubond and the A-Max.

I use Norma brass and use Redding full length neck bushing dies. I perform partial neck sizing (I leave about 1/10" of the neck unsized). I also size the brass to headspace off the shoulder by only pushing the shoulder back .001" from it's fired position.

Good luck, the 7RM is an outstanding choice for your stated usage.

AJ
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  #11  
Unread 06-28-2009, 10:45 PM
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Re: Novice: 7RM out to 600 yds.

Inside 600 yards BC AND velocity are important.

A 140 Nosler BT or Accubond at 3150 (BC 0.485) zeroed at 100 yds 10mph wind
at 600 yds Elevation 10.6 MOA Windage 3.7 MOA
A 162 A-max at 3060 (BC 0.625) zeroed at 100 yds 10 mph wind
at 600 yds Elevation 10.3 MOA Windage 2.9 MOA

The 140 gr is giving up 0.8 MOA windage, which means it will drift 4.8 inches more at 600 yards.

For the 7mm mag the best BC is over 0.6, 162 a-max 0.625 and the 168 berger 0.617. The heavier projectiles tend to have a higher BC but the 7mm mag has trouble sending them out fast enough to get the benefit of the higher BC inside of 600 yards.

You might be able to send the 140 gr out faster, possibly 3200 fps, depending on barrel length. The velocity for the 162 a-max is what I get from my 26" barrel.

Once you start looking at ballistic tables etc it is real easy to get caught up in detail. The best way to do it, I believe, is to let the rifle tell you what it likes and work your drop charts from there.
Pick a couple of bullets you like the sound of, find the best one for your rifle and then go out and shoot as much as you can out to 600 yards, that will make more of a difference than the one with the best BC.

Stu.
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  #12  
Unread 06-28-2009, 11:15 PM
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Join Date: Jul 2004
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Re: Novice: 7RM out to 600 yds.

Quote:
Originally Posted by kiwi3006 View Post
welcome to the site, i have a 7mm mag and i use 160 accubonds and 162 a-max. I use these bullets because of the high bc, especially the 162 a-max. Although i am about to switch to the 168 berger because the 162 a-max is unobtainable in new zealand at the moment.
I tend to use the 160 ab inside 300 yards and the 162 a-max past 300 yards. My friend took a large feral pig with the 162 a-max at 386 yards with my rifle. Drt.
On my rifle i have a vx iii 4.5 -14 x 40 lr. I like it, but don't know if it is the best value for money scope.

Hope this helps,

stu.
+1

j e custom
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  #13  
Unread 06-28-2009, 11:30 PM
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Join Date: Jun 2009
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Re: Novice: 7RM out to 600 yds.

Quote:
Originally Posted by kiwi3006 View Post
Inside 600 yards BC AND velocity are important.

A 140 Nosler BT or Accubond at 3150 (BC 0.485) zeroed at 100 yds 10mph wind
at 600 yds Elevation 10.6 MOA Windage 3.7 MOA
A 162 A-max at 3060 (BC 0.625) zeroed at 100 yds 10 mph wind
at 600 yds Elevation 10.3 MOA Windage 2.9 MOA

The 140 gr is giving up 0.8 MOA windage, which means it will drift 4.8 inches more at 600 yards.

For the 7mm mag the best BC is over 0.6, 162 a-max 0.625 and the 168 berger 0.617. The heavier projectiles tend to have a higher BC but the 7mm mag has trouble sending them out fast enough to get the benefit of the higher BC inside of 600 yards.

You might be able to send the 140 gr out faster, possibly 3200 fps, depending on barrel length. The velocity for the 162 a-max is what I get from my 26" barrel.

Once you start looking at ballistic tables etc it is real easy to get caught up in detail. The best way to do it, I believe, is to let the rifle tell you what it likes and work your drop charts from there.
Pick a couple of bullets you like the sound of, find the best one for your rifle and then go out and shoot as much as you can out to 600 yards, that will make more of a difference than the one with the best BC.

Stu.


Thanks again Stu...I understand why and why....Right-on! Thanks for explaining it in a way I can understand!!! Very helpful indeed!
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  #14  
Unread 06-28-2009, 11:36 PM
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Join Date: Jun 2009
Posts: 61
Re: Novice: 7RM out to 600 yds.

Quote:
Originally Posted by AJ Peacock View Post
Welcome to the site,

You have been given A-1 advice so far. I'll re-iterate most of the previous info as well as add some additional info.

I've been shooting the 7RM since 1978.

I've shot tons of different combinations of bullets/powders. I shot the Hornady 154gr flatbase bullets for a LONG time. I killed Mule deer past 700yds with it. It never failed to perform, it is also a very in-expensive bullet. At around $30/100 it is a steal for practice and is very workable as a hunting bullet.

I used to use H4831 for the 7RM, but have recently had exceptionally good results using RL-22 and it is now my go to powder for the 7RM.

For hunting, I also use the 160gr Nosler Accubond for most things. The 162gr A-Max shoots to nearly the same point of impact with the exact same powder in my rifle. I load them both to just over 3000fps (3015fps average actually).

I have found my best luck using non-magnum primers (currently use Rem 9 1/2 primers). My rifle will shoot around .25moa out to 200yds and sub 1/2moa out to 800yds when I do my part with both the Accubond and the A-Max.

I use Norma brass and use Redding full length neck bushing dies. I perform partial neck sizing (I leave about 1/10" of the neck unsized). I also size the brass to headspace off the shoulder by only pushing the shoulder back .001" from it's fired position.

Good luck, the 7RM is an outstanding choice for your stated usage.

AJ

AJ...Solid info and I appreciate it!!!

Very helpful indeed!

I definitely need to pick up a few bullets and see how they fly and then make my determinations from there!
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