Home Forums Reloading Big Game Rifles Good 7mm Mag loads...

Very true. Some fellas would croak when working up wildcat loads. Tis no different....

The 7RM has been basically denutted in recent manuals. Following manual recipes will basically give you a warm 7mm-08 load.

And another update to the Nosler 150 gr. Partition load I was working on earlier (26 inch, 1 in 9 Rock Creek barrel). Not much change in Velocity, ES, and SD but accuracy at 100 yards is 3 shots inside 1/2 inch. Should be good enough for my next hog hunt!

Bullet: Nosler 150 gr. Partition
Powder: IMR 7828 67.0 grs.
Primer: Federal 215
Case: Winchester (3rd Firing)
LOAL: 3.270 (2.744 Base to Ogive with Stoney Point)
Average Velocity: 3088.57 fps
ES: 29.14
SD: 14.56

Any experience/advice using the Hornady 139gr GMX monometal projectile? I'm hunting in the Peoples Republic of Californication, and next year non-tox will be mandatory Statewide. I'd assume it's similar to the Barnes 140 TTSX...

Just today. Load workup, 5 difference seating depths. I should have stopped at the shortest OAL.





MV 3040.





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This old post keeps popping back to the top!

Here are a few more.
65.0grs A-4350 150gr Nosler BT


63.5grs A-4350 160gr Accubond


69.5grs Reloader-26 150gr Nosler BT


70.0grs Reloader-26 150gr Nosler BT

Tag

RE: the Hornady 139 gr. GMX, I ended up using the Hodgdon data from their 2018 Manual. Their max load is w/ IMR 7828, 70.0 gr (compressed) @ 3191 fps. These are for use in a "rode hard, put away wet", mid-60s Rem 700 BDL (with the black copper and iron plating SS barrel) I picked up from a friend. I did put a Hogue Comp-stock on it (I'm a recoil wimp) and didn't cut my eye on the scope). I used IMR7828SSC and Fed215 primers in Win brass. I started at 65.5 but only got to 68.5gr. with very, very flat primers @ 3176fps. 66.5 of 7828SSC had a much less flattened primer @ 3100fps. At 50 yd. (my range's 100 yd. alley is out of action now), all but one of my mini-ladder loads were in an inch group. I think this Rem 700 has potential ! I can hear the choir saying "try Re22", and I will later but they don't list that powder in the Hodgdon Manual, nor does Alliant list the GMX projectile...I also intend to try the Barnes 120 TTSX w/ Re19 in the next round. Will check in with that info later.

In my 7mm Mag I only use 160gr Bullets. either Accubonds or Trophy Bonded Tipped.

1. 66gr RL23 160gr Accubond 215M primer Hornady case 3.300 OAL 3070fps SD 8.2 Very Accurate.

2. 67gr Norma MRP 160gr Trophy Bonded Tipped 215M primer Hornady case 3.290 OAL. 3080FPS SD 13.5

3. 68.6gr of RL26 160gr Trophy Bonded Tipped 215M primer Hornady case 3.300 OAL 3107fps SD 9.4

4. 73.0gr Retumbo 160gr Trophy Bonded Tipped 215M primer Hornady cases 3.280 OAL 3067fps SD 5.1

All shot thru a Vanguard S2 with 24" barrel. Using LabRadar.

Did this today




The lower hole is two shots.






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Tag

[quote=Pharmseller]Just today. Load workup, 5 difference seating depths. I should have stopped at the shortest OAL.





MV 3040.


Pharmseller-great pics and groups. Just making sure on the COAL that is working for you? I have a 2018 Tikka T3X Lite Stainless 7mm 24" barrel with little bastard brake on it. I've been working a load using IMR 7828 160 grain Accubonds, COAL 3.291.

I have one of those Hornady comparator thingies, it measures from the ogive (shoulder) of the bullet. Tip to base measurements can vary significantly, especially if you’re using exposed lead tipped bullets like the Partition. Measuring from the shoulder I have found to be much easier and consistent.

I usually post in terms of OAL, not COAL.




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Pharm-OAL I get it. Could you by change take a COAL measurement for me? SAMI says 2.90 for COAL, are you any where near that? Thank you!

Using your 160 Accubonds for the COAL. Thank you.

Pharm-sorry forum, I can't type today........

COAL using your 160 grain Accubonds, SAMI says 3.290 for COAL, are you any where near that? Thank you.

I find that the 7mm RM is one of the easier cartridges to shoot accurately. I used to shoot mainly 162 grain Hornady Interlock bullets, then 154 grain. I'm tending towards 150 Grain Nosler Partition these days. Nothing wrong with the Hornady bullets though.

Notes say 2.655” = 3.244” or thereabouts.




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