Caliber | Bullet | Case | Minimum OAL
(inches) | Bbl Length | Primer | Powder | Charge Weight
(grains) | Velocity
(fps) | Notes |
| 7mm Rem. Magnum | Speer 145 gr BTSP | Federal | 3.21 | 24 | Fed 215 | 4000-MR | 63 | 3,055 | - |
| 7mm Rem. Magnum | Speer 160 gr BTSP | Federal | 3.21 | 24 | Fed 215 | 4000-MR | 60 | 2,850 | - |
| 7mm Rem. Magnum | Speer 175 gr SP | Federal | 3.2 | 24 | Fed 215 | 4000-MR | 61 | 2,780 | |
Power Pro 4000-MR offers superior velocity and Lot-to-Lot uniformity. A spherical powder designed for magnum rifle calibers, the 4000-MR powder delivers improved velocity and density for easier metering. Because it's designed for specific cartridge and applications, it will allow reloaders to create a load similar to factory loaded ammunition. the 4000-MR powder offers superior performance for 7mm and 300 Winchester Magnum cartridges.
https://www.longrangehunting.com/threads/alliant-4000-mr.196658/
Here's other info I found in searching results:
One comment is that it may be moderately temperature sensitive. My own experience is that anytime you get over 90 degrees and hotter, almost everything even the hodgdon extremes will misbehave some.
This is what someone else wrote.
Currently I am using up this powder in my old springfield. Shooting 57 gr with 150 gr bullet. 1 MOA accuracy at 100yds.
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You asked. Here is all I reported several years ago:
The powder has finally hit the market. Did some comparative testing this morning. Was curious if 4000 MR would best RL-17's performance.
Two 7 Rem Mags were used. 24" and 30" barrels.
Original loads:
24" barrel. moly coated 150 nos bt, 67 gr of RL-17 vel 3260
30" barrel. Moly coated 140 accubond 66 gr of RL-17 vel 3400
Temperature for testing was mid 80s.
Worked up loads for 24" barrel, with two cases per 1 grain increments using same components/loading methods except for change in powder
66 gr vel 3046 3047
67 gr vel 3077 3106
68 gr vel 3151 3163
69 gr vel 3186 3183 max load for conditions
70 gr vel 3254 3264 hint of bolt lift/ shiny extractor mark
30" barrel again same components/loading methods
66 gr vel 3351 3287
67 gr vel 3356 3386
68 gr vel 3402 3403 hint of bolt lift bullets touched
69 gr vel 3452 3450 same bolt lift bullets touched
70 gr vel 3501 3477 accuracy fell off/harder bolt lift
71 gr vel 3521 3527 same as 70 gr
Impressions: this powder didn't surpass RL-17's velocities in the short barrel but duplicated and slightly surpassed RL-17 in the longer barrel. Some velocities were very similar as seen above. Has accuracy potential.
The extruded kernels are smaller, approx 1/2 the length of RL-17 with same diameter. Even with the max loads there is an air space between the powder and base of bullet.
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Just got back from the second testing session. This time shot moly coated 160 accubonds from the longer barreled 7 Rem Mag. (30")
Didn't have any loads to compare as this bullet hasn't been shot before. Decided to compare RL-25 and Power Pro 4000 MR.
Conditions were 90-93 degrees. Bullets were seated approx .030" into rifling. Neck sized/neck turned win brass, 215 match primer. Two shots fired with each powder increment.
Power Pro 4000 MR
62 gr 3015 3015
63 gr 3043 3060
64 gr 3098 3114 most accurate with two shots cutting each other
65 gr 3122 3141
66 3148 3163 hint of bolt lift/pressure
RL-25
70 gr 3096 3077
71 gr 3120 3131
73 gr 3235 3261
74 gr 3320 3294 hint of bolt lift/pressure
That pretty much concludes any testing with the 7 rem mags and Power Pro 4000 MR.
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Went out this morning to try some other rifles with Power Pro 4000 MR, began shooting at 6:30 am, temperature was 86 degrees.
First rifle 24" 243. Non moly coated 100 gr nosler partition. OAL 2.665" Each velocity listed is an average of four rounds.
243:
40 gr 2850
41 gr 2925 had best accuracy @ 3/4".
42 gr 2955
43 gr 3060 group opened up
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Second rifle 284 win with 23" barrel and 3.1" mag box. Moly coated 160 accubond OAL 3.085" Temperature 89 degrees
284:
53 gr 2735
54 gr 2765
55 gr 2815
56 gr 2845
57 gr 2875
55-57 shot nice 1/2" groups
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Retried the most accurate load with that 30" 7 rem mag. It was
64 grs. Today it didn't shoot at well even though the temperatures were the same. Velocites were the same approx 3118 or so. Four shot group approx 1 1/2".
