175gr Nosler Partition/7mm Rem Mag Velocities

Hirsch

Hirsch

Regular
Rating - 100%
11   0   0
Location
Grimshaw
I recently picked up a new Ruger 77 Hawkeye in 7mm Rem Mag on trade. While I'm waiting for the dies to arrive in the mail, I figured I'd do some load research. In particular I'm researching loads featuring the Nosler 175gr Partition (I was given 95 in another trade) and IMR 4350 (have a couple jugs on hand).
Anyhow, various websites have shown starting loads at 54gr (2,586 - 2,660 fps), to max of 57-58gr (2,698 - 2,860 fps). Having never reloaded for this caliber (or any other magnum), I was surprised by the variance in stated velocities. So I was wondering if any of my fellow GunNutz would care to share their experiences when it comes to velocities featuring this caliber, pill and powder. What can I reasonably expect with this combo?
 
Had the best luck with reloader 19 was very accurate with both 160 grain Accubonds and 175 grain partitions. I just use the loading data in the Nosler book nothing special, as I recall it was less than a maximum load and if I kept the 160s at about 2800 ft./s they would group in about half an inch in my Tikka. 61 grains of reloader 19 give me 2806 with 160 grain Accu bond. I can’t find my 175 data right now,if I do I will PMU or post it
 
In the speer manual they say :

There is quite a variation in published loading data for this caliber. Differences in cases, primers, and bullets all have an effect. This emphasizes our constant caution to always reduce loads whenever changing components from those used to develop data.

Seldom will either handloads or factory ammunition match normal factory ballistics in a sporting rifle and there is a great deal of velocity variation among sporters in this caliber. Rifles in the speer labs collection posted velocities varying from 400fps under to 300fps over those posted by the SAAMI pressure barrel with the same ammo. Because of this, we have departed from our usual policy of showing velocities from a sporter. The velocities for the 7mm Remington magnum are from a 24” pressure barrel.

Loads stay within the industry pressure limit of 52,000CUP.
 
hometownhero said:
In the speer manual they say :

There is quite a variation in published loading data for this caliber. Differences in cases, primers, and bullets all have an effect. This emphasizes our constant caution to always reduce loads whenever changing components from those used to develop data.

Seldom will either handloads or factory ammunition match normal factory ballistics in a sporting rifle and there is a great deal of velocity variation among sporters in this caliber. Rifles in the speer labs collection posted velocities varying from 400fps under to 300fps over those posted by the SAAMI pressure barrel with the same ammo. Because of this, we have departed from our usual policy of showing velocities from a sporter. The velocities for the 7mm Remington magnum are from a 24” pressure barrel.

Loads stay within the industry pressure limit of 52,000CUP.
Click to expand...

Yup, own that manual and read that too. That's why I'm so curious what handloaders have recorded under range conditions.
 
Potato boy said:
Had the best luck with reloader 19 was very accurate with both 160 grain Accubonds and 175 grain partitions. I just use the loading data in the Nosler book nothing special, as I recall it was less than a maximum load and if I kept the 160s at about 2800 ft./s they would group in about half an inch in my Tikka. 61 grains of reloader 19 give me 2806 with 160 grain Accu bond. I can’t find my 175 data right now,if I do I will PMU or post it
Click to expand...

Thanks Potato, appreciate it.
 
My 7mm Rem Mag [an early production 700 Remington] drives the 175 Partition out at 2950, but not with IMR or H4350.
The best powders with the 175 have been, Norma MRP, Reloder 22 and IMR 7828. Eagleye.
 
Potato boy said:
Had the best luck with reloader 19 was very accurate with both 160 grain Accubonds and 175 grain partitions. I just use the loading data in the Nosler book nothing special, as I recall it was less than a maximum load and if I kept the 160s at about 2800 ft./s they would group in about half an inch in my Tikka. 61 grains of reloader 19 give me 2806 with 160 grain Accu bond. I can’t find my 175 data right now,if I do I will PMU or post it
Click to expand...

Good grief!! 2806 with a 160 in a 7mm Mag? I come very close to that in my 7x57. There has to be another great accuracy node around 3000 fps.
It seems a terrible waste to be shooting that belted case with such potential at wimpy speeds. EE.
 
56gr rl22 168 smk 3000fps. That's the max load in my Lyman manual. Primer was slightly cratered. No additional signs of pressure. That was my highest fps on my ladder test. I found a node slightly below 55gr and another at around 63 of rl22
 
In my Winchester model 70 I tried RL22 and other various powders all with 175 grain bullets & yes I tried Nosler partitions. The most velocity I could reasonably get was 2850 using a chronograph. That was in a 24 inch barrel. I wanted to get 2900 but could not without extreme pressure. I was never enamored by it because of the velocity so I sold it. Tried it in another and same thing. Might as well stick with the 30-06 as it can do everything the 7mm can do with less fuss.
 
Eagleye said:
Good grief!! 2806 with a 160 in a 7mm Mag? I come very close to that in my 7x57. There has to be another great accuracy node around 3000 fps.
It seems a terrible waste to be shooting that belted case with such potential at wimpy speeds. EE.
Click to expand...

I get more speed form my 26" 7mm-08 then that with 162gr. Something isn't right there.


skidderman said:
In my Winchester model 70 I tried RL22 and other various powders all with 175 grain bullets & yes I tried Nosler partitions. The most velocity I could reasonably get was 2850 using a chronograph. That was in a 24 inch barrel. I wanted to get 2900 but could not without extreme pressure. I was never enamored by it because of the velocity so I sold it. Tried it in another and same thing. Might as well stick with the 30-06 as it can do everything the 7mm can do with less fuss.
Click to expand...


280 ai will do Better then that.
 
Eagleye said:
My 7mm Rem Mag [an early production 700 Remington] drives the 175 Partition out at 2950, but not with IMR or H4350.
The best powders with the 175 have been, Norma MRP, Reloder 22 and IMR 7828. Eagleye.
Click to expand...

Unfortunately I haven't access to any of the three powders you listed. I did however pick up a jug of H4831 this morning; perhaps you've played some with your 7mm and this powder?
 
Ruger 77 MK II, 24" barrel, I was doing just over 3000 with Hornady 175 interlocks with IMR 4350, FL sized Federal brass, magnum primers of some description. Won't post the load, but I usually consult at least 3 sources including Hodgdon's site and Water's Pet Loads and I stopped at sticky extraction at 26* C. 4350 is really fast for this application but works. Might try ordinary LR primers with it in this case next time based on something I read in Waters. 4831 would be a better choice, lots of guys say RL-22 but I haven't tried it.

7mm RM is a noisy 270 Win (or 30-06 at this bullet weight) if you just run from modern published data, but pick your cases and don't take any shortcuts if you run it hotter.
 
Hirsch said:
Unfortunately I haven't access to any of the three powders you listed. I did however pick up a jug of H4831 this morning; perhaps you've played some with your 7mm and this powder?
Click to expand...

H4831 with the 175 came up about 30 fps short of RL 22 in my rifle, but that is still decent velocities.
Start at 63 grains and work up carefully. Probably top out near 67. Eagleye.
 
don't take the powder charges on this chart as gospel, but the velocity potential for each powder is real

Code: 
Cartridge          : 7 mm Rem Mag
Bullet             : .284, 175, Nosler PART SP 35645
Useable Case Capaci: 76.478 grain H2O = 4.966 cm³
Cartridge O.A.L. L6: 3.290 inch = 83.57 mm
Barrel Length      : 24.0 inch = 609.6 mm

Predicted Data for Indicated Charges of the Following Powders.
Matching Maximum Pressure: 60000 psi, or 413 MPa
or a maximum loading ratio or filling of 103 %
These calculations refer to your specified settings in QuickLOAD 'Cartridge Dimensions' window.
C A U T I O N : any load listed can result in a powder charge that falls below minimum suggested
loads or exceeds maximum suggested loads as presented in current handloading manuals. Understand
that all of the listed powders can be unsuitable for the given combination of cartridge, bullet
and gun. Actual load order can vary, depending upon lot-to-lot powder and component variations.
USE ONLY FOR COMPARISON !

37 loads produced a Loading Ratio below user-defined minimum of 85%. These powders have been skipped.
Powder type          Filling/Loading Ratio  Charge    Charge   Vel. Prop.Burnt P max  P muzz  B_Time
                                      %     Grains    Gramm   fps     %       psi     psi    ms
---------------------------------  -----------------------------------------------------------------
Alliant RL33                       102.1     78.1     5.06    3013    97.3    60000   15930   1.218  ! Near Maximum !
Hodgdon Retumbo                    103.0     73.0     4.73    2982   100.0    58520   14129   1.211  ! Near Maximum !
Alliant RL26                        88.1     66.7     4.32    2953   100.0    60000   13557   1.231  ! Near Maximum !
Alliant RL25                        96.8     67.9     4.40    2950   100.0    60000   13308   1.215  ! Near Maximum !
Hodgdon H1000                      100.8     70.3     4.55    2943    99.7    60000   13746   1.199  ! Near Maximum !
IMR 7828                            95.7     65.6     4.25    2942    99.5    60000   13948   1.208  ! Near Maximum !
IMR 7828ssc                         90.6     65.6     4.25    2942    99.5    60000   13948   1.208  ! Near Maximum !
AA MagPro                           91.7     68.7     4.45    2940    98.3    60000   14557   1.223  ! Near Maximum !
Alliant RL22                        91.6     65.3     4.23    2921    99.9    60000   13722   1.224  ! Near Maximum !
Ramshot Magnum                      91.8     70.5     4.57    2909   100.0    60000   13204   1.220  ! Near Maximum !
Alliant RL19                        89.2     62.9     4.08    2885    99.9    60000   13124   1.220  ! Near Maximum !
Alliant RL23                        93.3     64.3     4.17    2875   100.0    60000   12240   1.236  ! Near Maximum !
Hodgdon H4831sc                     90.8     64.7     4.19    2870    99.1    60000   13137   1.217  ! Near Maximum !
Hodgdon H4831                       94.4     64.7     4.19    2870    99.1    60000   13137   1.217  ! Near Maximum !
Alliant RL16                        85.7     58.8     3.81    2855   100.0    60000   11938   1.236  ! Near Maximum !
IMR 4955 Enduron                    92.3     63.3     4.10    2842    99.2    60000   12752   1.219  ! Near Maximum !
Hodgdon H4350                       87.5     60.3     3.91    2829   100.0    60000   12092   1.226  ! Near Maximum !
IMR 4350                            85.8     60.2     3.90    2827   100.0    60000   12059   1.226  ! Near Maximum !
IMR 4831                            88.4     59.7     3.87    2823   100.0    60000   11705   1.244  ! Near Maximum !
 
You must log in or register to reply here.
Back
Top Bottom