7mm Mag

[sask boy]

Hi Guys, well stroke another one up to old age :shock: I have my nephew's CDL in the 7mm mag ready to drop in 60grs. of IMR4350 with 160gr ABs on top , but I can not remember what the COAL should be :x. I have not loaded for this rifle for 2 or 3 years and I can't find where I wrote it down.
So if anyone has loaded for this please send me some hints on the COAL.
I hope to get to the range either tomorrow evening or Thursday.

PS. I am going to be using the new Forster Ultra Seating die for the first time with this rifle.

Thanking everyone in advance.

Blessings,
Dan

 

[DrMike]

SAAMI COAL is 3.290 inches.

 

[sask boy]

Hi Mike, I have that but with the ABs being so long I was wondering if someone had a length they were using that really tighten up the groups.


Blessings,
Dan

 

[SJB358]

Do you have a way to gauge distance to the lands Dan?

I would start at 3.290 if you don't and see what comes out.


Cartridge : 7 mm Rem. Mag.(CIP)
Bullet : .284, 160, Nosler AccuBond 54932
Useable Case Capaci: 72.289 grain H2O = 4.694 cm³
Cartridge O.A.L. L6: 3.290 inch = 83.57 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : IMR 4350

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms

-10.0 81 54.00 2633 2463 43967 10634 98.0 1.389
-09.0 82 54.60 2659 2512 45242 10740 98.3 1.370
-08.0 83 55.20 2685 2561 46551 10843 98.6 1.351
-07.0 84 55.80 2711 2611 47894 10942 98.8 1.333
-06.0 85 56.40 2737 2661 49272 11038 99.0 1.316
-05.0 86 57.00 2762 2711 50688 11130 99.2 1.298
-04.0 87 57.60 2788 2761 52141 11219 99.4 1.281
-03.0 88 58.20 2813 2812 53633 11304 99.5 1.264
-02.0 89 58.80 2839 2863 55164 11386 99.6 1.248
-01.0 90 59.40 2864 2914 56737 11463 99.8 1.232 ! Near Maximum !
+00.0 91 60.00 2889 2966 58352 11537 99.8 1.216 ! Near Maximum !
+01.0 91 60.60 2914 3017 60010 11606 99.9 1.200 ! Near Maximum !
+02.0 92 61.20 2939 3069 61713 11672 100.0 1.185 ! Near Maximum !
+03.0 93 61.80 2964 3121 63462 11733 100.0 1.170 ! Near Maximum !
+04.0 94 62.40 2989 3173 65259 11791 100.0 1.155 !DANGEROUS LOAD-DO NOT USE!
+05.0 95 63.00 3013 3226 67106 11846 100.0 1.141 !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba 91 60.00 2988 3173 67679 11172 100.0 1.139 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 91 60.00 2747 2680 49028 11521 96.6 1.317

 

[Kodiak]

One-sixty ABs in my XCR are loaded to 3.360 to clear the magazine-box and are about 0.020" off touching in the throat. I "CAN" load them even longer in the box, but this Remington likes some clearance in the throat.

YMMV,

Jim

 

[FOTIS]

Pending on your rifle's mag and throat of course. I sat mine out to 3.330

 

[JD338]

Dan,

You will have to play with the COL for that rifle to find what ot likes.
>015-.020" off the lands (magazine COL permitting) is always a good place to start.

JD338

 

[Guy Miner]

Once you reach that ideal seating depth, in addition to writing it down and putting it in a file for that rifle, consider making up a dummy round with no primer or powder, and clearly labeling it for that rifle.

Can make it very easy to set your loading dies for that particular rifle in the future.

 

[sask boy]

Thanks guys I now have the starting point

Blessings,
Dan

 

[velvetant]

consider making up a dummy round with no primer or powder, and clearly labeling it for that rifle.
.

That's what I do. I put it in the box with my reloading dies along with the load data.
Once I find a keeper load my load data is saved on my computer, in a notebook and with my dies.