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

 
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  #1  
Old 09-24-2012, 02:34 AM
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7mm Rem Mag - 150gr NP - ADI AR2213SC (H4831sc) - Low velocities

Hi there,

I'd really appreciate some help and/or advice.

I recently bought a Remington 700 XCR II in 7mm Rem Mag. 24" tube, 3.6" mag.

To date I have been breaking the barrel in (using factory ammo) and have just started reloading for it. The barrel has fired 120 rounds to date (excluding the tests below)

My first effort was a 150gr Nosler Partition in a Hornady case on top of ADI AR2213SC (H4831sc) powder and a Federal 215M primer. COAL was 3.280" (or 2.625" using a comparator), which gives me a seating depth 20 thous of the lands. Loaded rounds were then given a very light crimp with a Lee Factory Crimp die. Cases were FL sized to the point where the shoulder was bumped 2-3 thous and cases were trimmed to 2.490".

I loaded 13 sets in 0.5gr increments from 59gr to 65gr. The powder charge was the only thing that was changed between all the sets. Each set consisted of 4 rounds.

@59gr according to the ADI Manual/Hodgdon website should have produced 2775fps. I got 2572 avg.
@61gr according to the Nosler reloading guide #6 should have produced 2985 fps. I got 2765 avg.
@62gr according to the ADI Manual/Hodgdon website should have produced 2956fps. I got 2718 avg.
@63gr according to the Nosler reloading guide #6 should have produced 3023 fps. I got 2817 avg.
@66gr according to the Nosler reloading guide #6 should have produced 3075 fps. I got 2925 avg.

I got 3 loads of interest.

One group of 1/4 inch @2633 fps. ES=63, SD=25.4. Good group, but way too slow to be usable and poor ES/SD.
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.
One group of 1 inch @2886 fps. ES=30.2, SD=13.6. Acceptable accuracy, but the pace is getting towards what I was expecting.

I have another 50 of these projectiles and would really like to try and get more from them. I tend to feel that trying a different powder may be worth while as I really would like to get closer to the 3000fps mark, but I'm unsure which way to go. Do I try a faster powder such as AR2209 (H4350), or a slower powder such as AR2217 (H1000) or Retumbo. I would prefer to only use temperature insensitive powders as I hunt in both summer (25-30 deg C) and winter conditions (sub zero deg C).

Also, could anyone explain why I seemed to constantly get 200fps less than that the book said I should expect. I think that 200fps is quite a lot. Is it the 24 inch tube, or is something else at play? As a further point of interest, I chronied some 162gr Hornady Superformance Factory Ammo, and you guessed it ... 200 fps below what the ammo box claimed. Box claimed 3030fps, I got 2815fps as an average of 5 shots.

Cheers
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Old 09-24-2012, 07:06 AM
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Re: 7mm Rem Mag - 150gr NP - ADI AR2213SC (H4831sc) - Low velocities

I get my best velocities in 7mm rem mag with IMR-4350. I tested IMR-7828, H-1000, and RL-22 for velocities and the H-1000 was the slowest by 200-300 FPS. The IMR-7828 was about 100fps slower than IMR-4350. The RL-22 was close to the IMR-4350, but I won't use it in my hunting guns due to its rumored temp instability. I'm just starting load development, but it looks like I will be able to get in the range of 1/2"-3/4" MOA in a stock Browning A-bolt. This is with 150g NP.
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Old 09-24-2012, 12:11 PM
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Re: 7mm Rem Mag - 150gr NP - ADI AR2213SC (H4831sc) - Low velocities

Quote:
Originally Posted by Robinhood493 View Post
I get my best velocities in 7mm rem mag with IMR-4350. I tested IMR-7828, H-1000, and RL-22 for velocities and the H-1000 was the slowest by 200-300 FPS. The IMR-7828 was about 100fps slower than IMR-4350. The RL-22 was close to the IMR-4350, but I won't use it in my hunting guns due to its rumored temp instability. I'm just starting load development, but it looks like I will be able to get in the range of 1/2"-3/4" MOA in a stock Browning A-bolt. This is with 150g NP.
Robinhood ... what velocities are you getting for the various powders that you tried?

Thanks mate.
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Old 09-24-2012, 12:17 PM
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Re: 7mm Rem Mag - 150gr NP - ADI AR2213SC (H4831sc) - Low velocities

I will have to look in my book tonight.
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Old 09-24-2012, 12:21 PM
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Re: 7mm Rem Mag - 150gr NP - ADI AR2213SC (H4831sc) - Low velocities

Quote:
Originally Posted by Robinhood493 View Post
I will have to look in my book tonight.
Thanks. I'd really appreciate that.

If you could also mention projectile weight per load that would be very helpful.

How long is your barrel?
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Old 09-24-2012, 12:22 PM
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Re: 7mm Rem Mag - 150gr NP - ADI AR2213SC (H4831sc) - Low velocities

Quote:
Originally Posted by proload View Post
Thanks. I'd really appreciate that.

If you could also mention projectile weight per load that would be very helpful.

How long is your barrel?
150g partition, 24" barrel with BOSS
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  #7  
Old 09-24-2012, 12:24 PM
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Re: 7mm Rem Mag - 150gr NP - ADI AR2213SC (H4831sc) - Low velocities

Perfect.

Your data will be very beneficial to me.

Thanks.
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