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7mm Rem Mag - 150gr NP - ADI AR2213SC (H4831sc) - Low velocities

 
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  #8  
Old 09-24-2012, 01:17 PM
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Location: New germany, NS
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Re: 7mm Rem Mag - 150gr NP - ADI AR2213SC (H4831sc) - Low velocities

I have had the best luck with 150 grn etip / mag primer / 67.0grn IMR7828 3000fps
Recently I have been experimenting with 162 grn amax and have yet to find a good load so, once this box is finished I will try 175grn sp (I have 200) I have been told that I should try rl22 for the heavey bullets so I will pick up a can on my next trip to the shop.
If you are in a spot with a lot of gophers try 139 grn sp with 45 grn imr 3031 std primer. the 3031 is a bit fast for the 7mm RM but with the lighter bullets it is very accurate
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  #9  
Old 09-25-2012, 08:38 AM
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Re: 7mm Rem Mag - 150gr NP - ADI AR2213SC (H4831sc) - Low velocities

Quote:
Originally Posted by proload View Post
Perfect.

Your data will be very beneficial to me.

Thanks.
IMR-7828
64g--2909fps
69g--3161fps

RL-22
62.5g--2904fps
68g--3165fps

H-1000
65g--2705fps
70g--2999fps

IMR-4350
59g--2948fps
65g--3240fps

150g partition out of a 24" Browning A-bolt with BOSS.
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  #10  
Old 09-25-2012, 10:24 AM
wbm wbm is offline
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Re: 7mm Rem Mag - 150gr NP - ADI AR2213SC (H4831sc) - Low velocities

Quote:
One group of 0.8 inch @2817 fps. ES=12.4, SD=5.4. Acceptable accuracy, but good ES/SD. Was hoping for more speed though.
Have been a big fan of the 7MM Magnum for years. This load looks outstanding for long range hunting. With a low ES like that you may find that your accuracy at 300 is great!

What I noticed is that you are assuming that the chronograph is giving you accurate information. I would not assume that. What I would do is go to JBM and do a manual calculation of velocity. Set the scope at let's say 3" high at 100. Using the ballistic calculator fire the rifle at 300 and see what the drop is. For example, your BC=.456 for the 150 NBT. I did a calculation on that bullet with a temperature of 59F and 35 percent humidity at sea level. In order to get a a 250 yard zero at a velocity of 2817 you would set the scope 3" high at 100. Play with the numbers and set your elevation, temperature, humidity etc. into the calculator. You can get pretty close to actual velocity by measuring bullet drop at various distances. Besides it is fun!

JBM - Calculations - Trajectory

Personally I would forget the crimp and would not clean the rifle until accuracy drops off.
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  #11  
Old 09-25-2012, 03:10 PM
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Re: 7mm Rem Mag - 150gr NP - ADI AR2213SC (H4831sc) - Low velocities

Quote:
Originally Posted by wbm View Post
With a low ES like that you may find that your accuracy at 300 is great!
Yes ... I plan to work more on this loading. It's the best option of the lot by a long stretch.

Quote:
Originally Posted by wbm View Post
What I noticed is that you are assuming that the chronograph is giving you accurate information. I would not assume that.
Yip ... thats a good point, and I have already arranged for 2 of my mates from the gun club to bring their chronies in on the next range day ... we'll shoot the load mentioned above over all 3 chronies and see what they do.

Quote:
Originally Posted by wbm View Post
Personally I would forget the crimp ...
Why no crimp ??

I have not crimped loads for many years, but my concern was projectile shifting even 10thous (either way) under a fair bit of recoil.
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  #12  
Old 09-25-2012, 07:58 PM
wbm wbm is offline
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Re: 7mm Rem Mag - 150gr NP - ADI AR2213SC (H4831sc) - Low velocities

Your point about the crimp is a good one,especially for hunting loads, but I might choose a bullet with a cannelure. Checked out the Nosler reload data and their accuracy loads with the 150g NP, with one exception, were in the 2750-2850 range with a 24" Wiseman barrel.

The current 7mm Mag I have is a 22" heavy barreled Savage.

I found that 69.5g of H4831 with a 120g Nosler BT is moving at about 3100fps. Winchester neck sized brass and a Federal 215M primer. OAL=3.30" Wickedly accurate!
Another is 71.6g Retumbo with a 140g Nosler BT. OAL=3.250".

You might give these a go in your Remington and see how they shoot.
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