7mm rem mag 7828

[keithcandler]

For guys that have Retumbo sitting around that needs shooting up, it works great in 24" barrels also.

I have nothing bad to say about R#26 or IMR 7977.

 

[tyeager2964]

I appreciate all the feedback. For anbody that has run 7977 or other enduron powders do you actually see a decrease in the copper fouling

 

[MudRunner2005]

I appreciate all the feedback. For anbody that has run 7977 or other enduron powders do you actually see a decrease in the copper fouling

I don't know about a decrease in copper fouling (most of mine are 5R and/or have been hand-lapped, so they don't buildup copper very much as it is), but I have noticed it is a VERY clean-shooting powder with less carbon in the barrel. Also, very low ES and SD numbers, and predictable velocity increases during workup. You know when you're reaching max pressure, because you'll see an abnormally large jump in velocity on the chronograph.

 

[jrock]

I've got to 3100 fps with 168 bergers with 7828. I got better velocities with this powder than H1000 in mine.

 

[mdbiggerstaff]

Browning 28" Eclipse Hunter IMR 4350/62.5 154SST 3142fps.
Nosler 175/Berger 180 IMR 4350/58
2840fps
139 & 140 IMR 4350/64 3231fps.

 

[mdbiggerstaff]

Browning 28" Eclipse Hunter IMR 4350/62.5 154SST 3142fps.
Nosler 175/Berger 180 IMR 4350/58
2840fps
139 & 140 IMR 4350/64 3231fps.
Not a 28" but a 26". Sorry, running too many numbers, chewing gum & walking at the same time!!!

 

[Ronald W Schaefer]

Had hell getting wife's 7mm RM in Sako Finnbear to shoot...finally after testing about 8 powders and 10 bullet combos I settled on 68 gr of RL-25, 160 gr Federal Trophy Bonded bullet, Fed 215 primer
...shoots sub MOA (finally) chronied at 2990 fps and SD of 12. Loading density of 92%--I'm calling that good.

 

[Canhunter35]

If the node is on the topside of 7828 range and you're not comfortable with it, you can try a slower powder than should put you into that node. But as others have said, manuals are guidelines

 

[Triggerhead Ed]

My Tikka 7 mag
Likes H1000 71gr
162 gr ELD-X
160gr Tiped Match Kings
2950 FPS
Shooting under 1/2 MOA

By all means try new loads don't loose your old recipe
Animals and targets don't care if your not shooting maximum velocity
Also brass and barrels last longer
If you start loosing accuracy in your Tikka change the aluminum recoil lug to a new steel lug problem gone
Have a Great day at the range

 

[Michael O'Connor]

So I bought a magneto speed sporter and finally got to play today. I have an accurate load for my 7 mm RM with 160 gr Sierra but I knew it was slow with only 60.5 of 7828 behind it. I calculated it at 2700 fps with drop data and the new toy confirmed 2681 avg with an sd of 9. It shoots great but what's the point of a 7 mag at that velocity.

Long story short I loaded up my final 6 bullets at 65 and 65.5 grains of IMR 7828. They both shot close to half MOA which is all I'm looking for really but I dont have any more to load to chrono. I dont have any pressure signs but that's 1 grain over book max (depending on book).

Can anyone with quick load give me an estimated velocity guess. If its linear I can simply do the math but I'm guessing pressure curves aren't (hence curves).

Sierra SPBT 160 gr model #1920
IMR 7828
Federal 215 large mag primer
Hornady cases
Loaded CBTO is 2.726 (fit in Tikka mag)
24" barrel

I dont want to buy more 7828 if I cant get to 2950 or so

Any advice on my next powder? Its likely going to be 4831sc or the newer enduron 7977. I'm ideally looking for 3000 give or take with a 160gr pill

Just use RL-26 for anything over 120 gr. and you should get maximum velocity without great pressure if you do a decent 1/2 grain ladder for pressure signs. Factory loads get 2950 fps with 160 gr

 

[Michael O'Connor]

Had hell getting wife's 7mm RM in Sako Finnbear to shoot...finally after testing about 8 powders and 10 bullet combos I settled on 68 gr of RL-25, 160 gr Federal Trophy Bonded bullet, Fed 215 primer
...shoots sub MOA (finally) chronied at 2990 fps and SD of 12. Loading density of 92%--I'm calling that good.

RL-26 will give you about the same velocity with 1gr. less powder.

 

[Chuckhunter]

Tyeager, just wanted to remind you that the data you generously received from one of the members from the QL program if done at the programs default temperature (70") should really be adjusted for the temps that you were chronographing at. All powders will vary according to temperature large changes, even the so called temp. stable powders, just not as much. Keep that in mind if you are working up your loads in cold temps and have plans to shoot them during hot summer days. Good luck with your quest.

 

[Scratch]

IMR-7828 66.0 grains
175 Nosler Partition
CCI-250
WW- Brass
MV @15' 3060 fps
26" barrel
* posted just for an example for the 7mm Rem Mag and IMR-7828

 

[arch408]

1/2 MOA with no preasures signs. I'd stay with that load. But any way, for estimating velocity, you have the law of diminishing returns I.E.,twice the energy only give you half again in velocity. If you started with 60 grains and 2800 FPS and then loaded 6 more grains which is a 10% increase. You could probably expect only a 5% percent increase in velocity (.05 X 2800=@ 140 FPS increase). Remember, this is only a guesstimate! But any, I would take 1/2 MOA over an additional 100 FPS any day! But that's me.