7mm mag powder choice

kaseyfied

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Alright... wanna know what people are thinking for a TI build i just finished. Going to do load work. I have the following powders. I want to load 175 bergers and 180 bergers

H1000
8133
N565
N568- really hoping someone has loaded some;)
N570

Im got it throated long also.. 3.580

Kasey
 

MagnumManiac

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H1000 for a stable powder. If you’re chasing speed and accuracy, I have always found very good accuracy with RE25 and, it’s not as temp sensitive in my testing as the interweb makes out.
I have used it to 800+ without an issue, but it was during winter that it was hunted with and the temps were between 0°C and 16°C most of the time.
568 sounds like a good option, just not sure where it lies in regard to H1000?

Cheers.
 

MtnMann

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Feb 12, 2020
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Western Slope Colorado
Alright... wanna know what people are thinking for a TI build i just finished. Going to do load work. I have the following powders. I want to load 175 bergers and 180 bergers

H1000
8133
N565
N568- really hoping someone has loaded some;)
N570

Im got it throated long also.. 3.580

Kasey
What barrel length is it?

I have not had a chance to use any of the VihtaVuori powders, but I have used H1000 and RL26 in my factory Rem 700 in 7 Rem Mag. Found the best velocities with RL26 running the 180gr Berger VLD Hunting.
 

fraz01

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washington
I would start with IMR 8133 and VV N570. With the long throat you should be to able get to max pressure with these powders.
 

Veteran

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Mar 10, 2021
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Michigan
RL 33
0.267​
US869
0.2735​
N570
0.277​
RSLRT
0.285​
IMR 8133
0.3​
N565
0.319​
ACC MagPro
0.3342​
RETUMBO
0.337​
RL26
0.3397​
RSMag
0.345​
H1000
0.366​


Above I have posted popular slow burning powders on a numbers basis H1000 being the Fastest and RL 33 being the Slowest.

N568 is at 0.30 identical to 8133 in the list above. It is a blend of N565 and N570. If you PM me what the volume of you brass is in H20 weight, what bullet you are using, how long your barrel is, and where you will seat your bullet or Coal, I can model it for you to give you some starting loads. I would not recommend trying to use 8133 data just because the published burn rate is the same. But, all of this should help you figure things
out.

I would note, that Vihtavuori does not list even N565 in their load data until at least 180 to 190 gr. bullets in 7MM Mag.
Below that its their faster N560 which is more comparable to H1000. So unless you are going to use really heavy bullets,
stuff like N570 and N568 may be too slow to get optimum accuracy, though you may get more velocity?
 

kaseyfied

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oregon
@kaseyfied get ahold of jake at unknown munitions, chances are he's messed with 568 in the rem mag case.
Yeah no thanks.. i got ammo from him for barrel break in.. it **** 100fps spread and they said unknown factors can cause that not the ammo.. so he can keep it.. pulled 5 cases .5 grain difference on some.. i ran quick loads qnd loaded to 74 grains 568.. shall see

Kasey
 
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