Anyone have Chrono. data for their 7mm Rem. Mag.?
- Thread starter Lefty Dick
- Start date
john-brennan
CGN frequent flyer
- Location
- Vancouver Island B.C.
I only shoot 160gr partition gold, but a great load is 66gr H4831 at 3150fps and accurate.
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I did alot of chrony work with my 7mm Mag years ago when I first got the chrony. I found out that 63 grs RL22 behind a moly 160 gr Partition gold didnt do 3000+ fps out of my 26" barrel. 2750 fps avg! 
took 70 grains of RL25 to push a 160 gr speer bt to 2900 fps. I think, despite the 26 inch tube, I just had a "slow" gun
my 2nd 7mm Rem Mag was a 26" 700 Sendero SF. 72 grains H1000 pushed a 140 gr Triple SHock X to 3200 fps. Thats about the only load I worked on in that rifle before selling it. 160 gr Federal premium nosler ammo did 2850 fps avg out of that gun
took 70 grains of RL25 to push a 160 gr speer bt to 2900 fps. I think, despite the 26 inch tube, I just had a "slow" gunmy 2nd 7mm Rem Mag was a 26" 700 Sendero SF. 72 grains H1000 pushed a 140 gr Triple SHock X to 3200 fps. Thats about the only load I worked on in that rifle before selling it. 160 gr Federal premium nosler ammo did 2850 fps avg out of that gun
Yes I have done quite a bit over the past three years with my Tikka in 7mm mag (24" barrel). Here is what I have and all velocities listed are averages over about 10-15 rounds. Powder charges are the most accurate I found in my rifle.
150 grain Nosler Balistic tip, 62 grains IMR 4350 gave 3130 fps
150 grain Sierra Boattail, 60 grains IMR 4831 gave 2797 fps ( lower velocity but the most accurate load using that powder)
150 grain Sierra Boattail, 62.2 grains IMR 4831 gave 3006 fps
145 grain Speer Boattail, 67.3 grains RL 22 gave 3172 fps
145 grain Speer Boattail, 69.3 grains IMR 7828 gave 3093 fps
160 grain Nosler Accubond, 60.0 grains IMR 4350 gave 2886 fps. I am currently hunting with this load. Very accurate.
These loads are the only ones worth mentioning in terms of accuracy. I have found that my rifle likes the 4350 and if the velocities go too far over 3100 fps I loose quite a bit of accuracy. If I keep the velocity around 3000-3100 the load usually groups quite well.
Jacky
150 grain Nosler Balistic tip, 62 grains IMR 4350 gave 3130 fps
150 grain Sierra Boattail, 60 grains IMR 4831 gave 2797 fps ( lower velocity but the most accurate load using that powder)
150 grain Sierra Boattail, 62.2 grains IMR 4831 gave 3006 fps
145 grain Speer Boattail, 67.3 grains RL 22 gave 3172 fps
145 grain Speer Boattail, 69.3 grains IMR 7828 gave 3093 fps
160 grain Nosler Accubond, 60.0 grains IMR 4350 gave 2886 fps. I am currently hunting with this load. Very accurate.
These loads are the only ones worth mentioning in terms of accuracy. I have found that my rifle likes the 4350 and if the velocities go too far over 3100 fps I loose quite a bit of accuracy. If I keep the velocity around 3000-3100 the load usually groups quite well.
Jacky
Shot lots of 160 Partitions out of the 7mm Mag for hunting. Pet load was 66 grains of Norma MRP for right around 3070. My present long range fun load for my 7mm Mag is 150 Ballistic Tip chased by 65 grains of IMR 4831. It chronys at 3025 avg for five with an extreme spread of 11 FPS. Regards, Eagleye.
65 grains of H4831sc would do 2891 fps out of my 26" Sendero, with that 154 gr Interbond
another 7mm Mag, a Parker Hale 24", chrony'd the same load @ 2840 fps
Hornady's book max load with that powder in the #4 manual was 61.0 grains 
another 7mm Mag, a Parker Hale 24", chrony'd the same load @ 2840 fps
Hornady's book max load with that powder in the #4 manual was 61.0 grains
Just what I suspected Todd.
I chrono'd some pre lim stuff in my 7RM in a Rem 700 with a 24" tube. 150gr. Fed. factory fodder was only clocking 2920fps and it's advertised at 3110fps, very grim in my opinion. And some 150 Nosler BT's on top of 65g. of IMR4831 did pretty much bang on 2900fps. I know the chrony was clocking bang on yesterday a couple of other rifles were kicking out bang on to what they always do.
So if your data and mine prove out to be the norm how the heck do these guys claim the 7em em is better than a 270 Win?
I chrono'd some pre lim stuff in my 7RM in a Rem 700 with a 24" tube. 150gr. Fed. factory fodder was only clocking 2920fps and it's advertised at 3110fps, very grim in my opinion. And some 150 Nosler BT's on top of 65g. of IMR4831 did pretty much bang on 2900fps. I know the chrony was clocking bang on yesterday a couple of other rifles were kicking out bang on to what they always do.
So if your data and mine prove out to be the norm how the heck do these guys claim the 7em em is better than a 270 Win?
- Location
- Vancouver Island BC
7mm
I get 2900 fps out of a 22 inch tubed 7x57 Mauser using 52 grains of H4350 pushing a 140 grain bullet.
Now I remember why I sold my 7 mag.................
I get 2900 fps out of a 22 inch tubed 7x57 Mauser using 52 grains of H4350 pushing a 140 grain bullet.
Now I remember why I sold my 7 mag.................
The best results come with VERY slow powders I've found. Slower than what are traditionally used in this cartridge. I'd consider H1000 to be about as fast as I'd want to go, although I've admittedly only done load work with bullets in the 160gr range. Faster powders tend to hit the pressure ceiling before the capacity one. Nosler 160's over 78gr of H870 get me ~3150 fps over the chrony. You can't get 870 anymore, but I've still got a bunch left. (I bought a 16lb box ages ago) The problem with 870 is that it's dirty, and very temperature sensitive. I look forward to trying the new Hodgdon 869. The Reloader series of powders (22 and 25, notably) turn in acceptable results as well, right around the 3000fps mark with the nosler 160's.
This is in a winchester m70 with a 26" pipe.
) The problem with 870 is that it's dirty, and very temperature sensitive. I look forward to trying the new Hodgdon 869. The Reloader series of powders (22 and 25, notably) turn in acceptable results as well, right around the 3000fps mark with the nosler 160's.This is in a winchester m70 with a 26" pipe.
303carbine you make a very good point. I actually bought the 7mm Rem Mag for the action, but the borescope showed the barrel to be in pretty good shape and the deal included dies, so what the heck I thought I'd give reloading for it a try. I do find that lots of fellows claim hopped up speeds but when asked about chrony data they dummy right up.
My 284Win with it's 22.5" bbl. was clocking 139's @ 3080fps, so guess where that leaves the venrable 7em em?
Another interesting thing was the fellow also supplied some relads with the rifle, some consisted of 160gr. Speers, and they only clocked @ 2700fps. My lowley 308Win(22" bbl.) will drive 165's @ 2660fps.
Makes you go hmmm.
I'll tinker with the Rem Mag a bit after deer season, and see where things go.
My 284Win with it's 22.5" bbl. was clocking 139's @ 3080fps, so guess where that leaves the venrable 7em em?
Another interesting thing was the fellow also supplied some relads with the rifle, some consisted of 160gr. Speers, and they only clocked @ 2700fps. My lowley 308Win(22" bbl.) will drive 165's @ 2660fps.
Makes you go hmmm.
I'll tinker with the Rem Mag a bit after deer season, and see where things go.
- Location
- Calgary, AB
I used H870 years ago in my A-Bolt 7mm RM and 162gr Hornady BTSP. Three shots into .67" at 100yds. Velocity around 3000fps.
Maybe try AA8700?
Maybe try AA8700?
I've played with 5 or 6 7mags, and find I can get around 3000 with a 160 grainer. Usually 66 grains of RL22 or H4831. RL22 is a bit hotter with this combo than H4831.
Not one of my favourite cartridges as I find my 280AI can just about duplicate it, but I did just buy one this morning... It's a hobby, whatya do?
Not one of my favourite cartridges as I find my 280AI can just about duplicate it, but I did just buy one this morning...
It's a hobby, whatya do?Rick could you please site your source for the loads you mention. They range from 1 to 5 grs. over any loads I find in a printed manual. Better yet have you tested them for operating pressures.
I have one word for you. Cumulative Metal Fatigue
I have one word for you. Cumulative Metal Fatigue
actually, that is three words
a 7mm Mag will propel a 160 grain bullet at somewhere around 3000-3050 fps out of a 24-26" barrel at maximum safe operating pressures. Slower burning powders like H4831, RL22, 7828, H1000, etc are the best way to achieve this speed/pressure combo. Most book loads are on the soft side, despite the large case capacity of this cartridge. Thus it becomes basically a 270 winchester
a 7mm Mag will propel a 160 grain bullet at somewhere around 3000-3050 fps out of a 24-26" barrel at maximum safe operating pressures. Slower burning powders like H4831, RL22, 7828, H1000, etc are the best way to achieve this speed/pressure combo. Most book loads are on the soft side, despite the large case capacity of this cartridge. Thus it becomes basically a 270 winchester
303carbine said:I get 2900 fps out of a 22 inch tubed 7x57 Mauser using 52 grains of H4350 pushing a 140 grain bullet.
Now I remember why I sold my 7 mag.................
This is nice and what a great caliber. I regret selling my 7X57 bigtime. I can't find the chrony data but I was loading a 140 accubond with IMR 4350 and it was sweet.
Jacky
64.5 gr of reloder 22 would get me just over 3000 fps with a 160 gr accubond last year in a Sako 7mm mag I had. I sold it, I didn't find it would do anything a 30-06 wouldn't do. Now I'm shooting a 30 win Sako Av and am getting 3200 fps from a 168 gr TSX, a little more recoil, way more punch.
In my 7RM, wiht some loads, I use well over maximum from the manuals, and with some loads I hit the wall rigth about maximum load.
As Bartell says, most loads are on the soft side for the case capacity, which is generous. Problem as I understand it is that some 7RM's have been known to pressure spike.
I'm not sggesting to anyone that they should exceed maximum loads, and I rarely do in any other cartridge, actually. Just that every rifle is a differnet beast, some have more freebore than others, and some have tighter chambers....
If you are at maximum loads and the chronograph isn't reading anywhere close to what it should, it may be time for cautious, and informed experimentation. If you know what you are doing!!!
PLEASE DON"T EXCEED MAXIMUM LOADS!!!
As Bartell says, most loads are on the soft side for the case capacity, which is generous. Problem as I understand it is that some 7RM's have been known to pressure spike.
I'm not sggesting to anyone that they should exceed maximum loads, and I rarely do in any other cartridge, actually. Just that every rifle is a differnet beast, some have more freebore than others, and some have tighter chambers....
If you are at maximum loads and the chronograph isn't reading anywhere close to what it should, it may be time for cautious, and informed experimentation. If you know what you are doing!!!
PLEASE DON"T EXCEED MAXIMUM LOADS!!!
