Load Specifications
Load data in caliber .300 RCM with .308 | 150gr | Peregrine Plainsmaster (VLR-4) bullet and 98 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 2000-MR, ReloadSwiss RS 52 and ReloadSwiss RS 60.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 88% | 54,781 psi | 86% | 2884 fps | 100% |
| Accurate 2460 | <<locked>> | 86% | 56,753 psi | 89% | 2956 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 55,492 psi | 87% | 2940 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 54,897 psi | 86% | 2966 fps | 100% |
| Accurate 4064 | <<locked>> | 96% | 55,361 psi | 87% | 2982 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 47,718 psi | 75% | 2930 fps | 97.7% |
| Accurate LT-30 | <<locked>> | 82% | 54,505 psi | 85% | 2828 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 54,897 psi | 86% | 2854 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 57,609 psi | 90% | 3031 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 96% | 55,085 psi | 86% | 2969 fps | 99.2% |
| ADI AR 2219 | <<locked>> | 82% | 55,288 psi | 87% | 2953 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 56,811 psi | 89% | 2982 fps | 100% |
| Alliant AR-Comp | <<locked>> | 90% | 56,724 psi | 89% | 2959 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 54,766 psi | 86% | 3038 fps | 99.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 57,290 psi | 90% | 3146 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 54,259 psi | 85% | 2989 fps | 99.8% |
| Alliant Reloder-10x | <<locked>> | 84% | 54,433 psi | 85% | 2887 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 55,303 psi | 87% | 3012 fps | 99.3% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 47,442 psi | 74% | 2946 fps | 97.8% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 55,288 psi | 87% | 3110 fps | 99.9% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 57,217 psi | 90% | 2871 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 57,450 psi | 90% | 3041 fps | 99.2% |
| Bofors RP3 | <<locked>> | 96% | 54,752 psi | 86% | 3005 fps | 99.9% |
| Bofors RP7ᴾ | <<locked>> | 100% | 55,419 psi | 87% | 2959 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 88% | 55,405 psi | 87% | 2917 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 55,840 psi | 88% | 3012 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 53,882 psi | 84% | 3051 fps | 99.2% |
| Hodgdon H322 | <<locked>> | 86% | 57,508 psi | 90% | 2982 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 54,926 psi | 86% | 2956 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 56,304 psi | 88% | 3015 fps | 98.6% |
| Hodgdon H4895 | <<locked>> | 90% | 54,534 psi | 85% | 2986 fps | 99.7% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 43,468 psi | 68% | 2822 fps | 98.3% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 57,246 psi | 90% | 3071 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,548 psi | 54% | 1804 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 56,028 psi | 88% | 2989 fps | 99.8% |
| IMR 3031 | <<locked>> | 92% | 57,421 psi | 90% | 3025 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 54,404 psi | 85% | 2949 fps | 99.2% |
| IMR 4166 Enduron | <<locked>> | 92% | 55,143 psi | 86% | 2930 fps | 96.3% |
| IMR 4198 | <<locked>> | 84% | 55,027 psi | 86% | 2851 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 57,711 psi | 90% | 2999 fps | 96.7% |
| IMR 4831ᴾ | <<locked>> | 100% | 45,527 psi | 71% | 2874 fps | 97.3% |
| IMR 4895 | <<locked>> | 94% | 56,681 psi | 89% | 3048 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 90% | 56,811 psi | 89% | 2982 fps | 100% |
| Lovex D073.5 | <<locked>> | 86% | 56,811 psi | 89% | 2966 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 56,681 psi | 89% | 3002 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 57,609 psi | 90% | 2956 fps | 99.7% |
| Lovex S062 | <<locked>> | 96% | 57,276 psi | 90% | 2999 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 52,823 psi | 83% | 2933 fps | 97.3% |
| Norma 200 | <<locked>> | 82% | 57,624 psi | 90% | 2904 fps | 100% |
| Norma 201 | <<locked>> | 92% | 56,043 psi | 88% | 2969 fps | 100% |
| Norma 202 | <<locked>> | 92% | 56,637 psi | 89% | 2979 fps | 100% |
| Norma 203B | <<locked>> | 96% | 57,696 psi | 90% | 3048 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 47,776 psi | 75% | 2930 fps | 97.6% |
| Ramshot Big Game | <<locked>> | 94% | 54,868 psi | 86% | 3025 fps | 99.5% |
| Ramshot TAC | <<locked>> | 90% | 57,522 psi | 90% | 2999 fps | 98.2% |
| Ramshot Wild Boar | <<locked>> | 90% | 56,492 psi | 89% | 3015 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 86% | 54,346 psi | 85% | 2927 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,853 psi | 55% | 1847 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 56,449 psi | 88% | 2969 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 57,101 psi | 89% | 2999 fps | 97.3% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 55,477 psi | 87% | 3081 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 55,027 psi | 86% | 3114 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 47,718 psi | 75% | 2956 fps | 97.4% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 48,646 psi | 76% | 2976 fps | 96.9% |
| Rottweil R 901 | <<locked>> | 90% | 56,768 psi | 89% | 2956 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 56,159 psi | 88% | 2963 fps | 100% |
| Rottweil R 903 | <<locked>> | 98% | 54,331 psi | 85% | 2989 fps | 99.8% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 55,419 psi | 87% | 2959 fps | 95.7% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 52,823 psi | 83% | 2933 fps | 97.3% |
| Shooters World Match Rifle | <<locked>> | 92% | 56,681 psi | 89% | 3002 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 57,276 psi | 90% | 2999 fps | 100% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 56,478 psi | 89% | 2940 fps | 99.9% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 57,595 psi | 90% | 2612 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 55,463 psi | 87% | 2959 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 56,811 psi | 89% | 3061 fps | 99.7% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 55,796 psi | 87% | 2917 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 55,492 psi | 87% | 2969 fps | 98.3% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 56,072 psi | 88% | 2999 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 54,563 psi | 86% | 2867 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 54,389 psi | 85% | 2861 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 53,737 psi | 84% | 2887 fps | 96% |
| Somchem S321 | <<locked>> | 86% | 54,447 psi | 85% | 2963 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 57,217 psi | 90% | 2913 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 55,100 psi | 86% | 2966 fps | 99.5% |
| Somchem S355 | <<locked>> | 98% | 55,056 psi | 86% | 2992 fps | 99.7% |
| Somchem S365ᴾ | <<locked>> | 100% | 42,366 psi | 66% | 2871 fps | 99.3% |
| Vihtavuori N130 | <<locked>> | 86% | 54,520 psi | 85% | 2838 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 54,592 psi | 86% | 2854 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 55,608 psi | 87% | 2933 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 56,985 psi | 89% | 2953 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 56,811 psi | 89% | 2972 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 50,270 psi | 79% | 2930 fps | 98% |
| Vihtavuori N530 | <<locked>> | 90% | 57,276 psi | 90% | 2979 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 55,332 psi | 87% | 2949 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 49,269 psi | 77% | 2933 fps | 97.6% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 51,605 psi | 81% | 2923 fps | 99.6% |
| Winchester 748 | <<locked>> | 90% | 56,971 psi | 89% | 3031 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 92% | 55,550 psi | 87% | 3002 fps | 99.8% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 42,424 psi | 66% | 2687 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 46,325 psi | 73% | 2795 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 34,664 psi | 54% | 2585 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 41,495 psi | 65% | 2743 fps | 99.6% |
| Accurate 4064 | <<locked>> | 80% | 32,779 psi | 51% | 2566 fps | 98.8% |
| Accurate 4350 | <<locked>> | 94% | 38,624 psi | 61% | 2753 fps | 95.3% |
| Accurate LT-30 | <<locked>> | 80% | 51,082 psi | 80% | 2779 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 51,459 psi | 81% | 2802 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 39,102 psi | 61% | 2690 fps | 96.8% |
| ADI AR 2208 | <<locked>> | 84% | 37,782 psi | 59% | 2644 fps | 95.6% |
| ADI AR 2219 | <<locked>> | 80% | 51,445 psi | 81% | 2894 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 41,205 psi | 65% | 2710 fps | 98.4% |
| Alliant AR-Comp | <<locked>> | 80% | 40,321 psi | 63% | 2713 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 47,863 psi | 75% | 2920 fps | 99.1% |
| Alliant Power Pro 2000-MR | 52.2 gr | 82% | 37,826 psi | 59% | 2759 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 32,300 psi | 51% | 2549 fps | 95.5% |
| Alliant Reloder-10x | <<locked>> | 80% | 48,153 psi | 75% | 2795 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 37,333 psi | 59% | 2671 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 94% | 39,291 psi | 62% | 2769 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 86% | 34,200 psi | 54% | 2674 fps | 95.4% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 50,198 psi | 79% | 2772 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 38,058 psi | 60% | 2684 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 31,459 psi | 49% | 2543 fps | 95.4% |
| Bofors RP7 | <<locked>> | 98% | 52,170 psi | 82% | 2907 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 43,279 psi | 68% | 2710 fps | 99.2% |
| Hodgdon BL-C2 | <<locked>> | 80% | 39,349 psi | 62% | 2720 fps | 98.6% |
| Hodgdon CFE223 | <<locked>> | 80% | 43,395 psi | 68% | 2861 fps | 97.4% |
| Hodgdon H322 | <<locked>> | 80% | 47,021 psi | 74% | 2825 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 48,037 psi | 75% | 2848 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 40,147 psi | 63% | 2723 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 39,378 psi | 62% | 2707 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 33,605 psi | 53% | 2598 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 35,244 psi | 55% | 2661 fps | 96.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,628 psi | 40% | 1614 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 37,898 psi | 59% | 2657 fps | 97% |
| IMR 3031 | <<locked>> | 80% | 38,464 psi | 60% | 2713 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 37,043 psi | 58% | 2621 fps | 95.6% |
| IMR 4166 Enduron | <<locked>> | 90% | 51,735 psi | 81% | 2874 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 48,965 psi | 77% | 2762 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 51,111 psi | 80% | 2890 fps | 95.3% |
| IMR 4831 | <<locked>> | 96% | 39,929 psi | 63% | 2762 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 35,737 psi | 56% | 2648 fps | 95.8% |
| IMR 8208 XBR | <<locked>> | 80% | 41,205 psi | 65% | 2710 fps | 98.4% |
| Lovex D073.5 | <<locked>> | 80% | 46,151 psi | 72% | 2799 fps | 99.7% |
| Lovex D073.6 | <<locked>> | 80% | 37,318 psi | 58% | 2667 fps | 99% |
| Lovex S060 | <<locked>> | 80% | 39,769 psi | 62% | 2641 fps | 97% |
| Lovex S062 | <<locked>> | 80% | 34,447 psi | 54% | 2572 fps | 96.8% |
| Lovex S065 | <<locked>> | 94% | 43,743 psi | 69% | 2769 fps | 95.1% |
| Norma 200 | <<locked>> | 80% | 54,288 psi | 85% | 2861 fps | 100% |
| Norma 201 | <<locked>> | 80% | 38,232 psi | 60% | 2648 fps | 97.9% |
| Norma 202 | <<locked>> | 80% | 38,334 psi | 60% | 2664 fps | 99.5% |
| Norma 203B | <<locked>> | 80% | 34,316 psi | 54% | 2602 fps | 95.2% |
| Norma URP | <<locked>> | 94% | 39,044 psi | 61% | 2756 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 82% | 36,274 psi | 57% | 2667 fps | 95.6% |
| Ramshot TAC | <<locked>> | 82% | 43,947 psi | 69% | 2759 fps | 95.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 40,335 psi | 63% | 2726 fps | 97.1% |
| Ramshot X-Terminator | <<locked>> | 80% | 44,628 psi | 70% | 2759 fps | 98% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,788 psi | 40% | 1650 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 46,253 psi | 72% | 2805 fps | 99.8% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 46,601 psi | 73% | 2822 fps | 95.1% |
| ReloadSwiss RS 52 | 49.3 gr | 80% | 35,998 psi | 56% | 2707 fps | 95.1% |
| ReloadSwiss RS 60 | 50.1 gr | 80% | 29,718 psi | 47% | 2552 fps | 95.9% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 41,437 psi | 65% | 2831 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 42,467 psi | 67% | 2848 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 41,742 psi | 65% | 2703 fps | 99.7% |
| Rottweil R 902 | <<locked>> | 80% | 36,274 psi | 57% | 2598 fps | 97.3% |
| Rottweil R 903 | <<locked>> | 82% | 31,763 psi | 50% | 2543 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 98% | 52,170 psi | 82% | 2907 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 94% | 43,743 psi | 69% | 2769 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 37,318 psi | 58% | 2667 fps | 99% |
| Shooters World Precision | <<locked>> | 80% | 34,447 psi | 54% | 2572 fps | 96.8% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 49,008 psi | 77% | 2822 fps | 99.4% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 54,636 psi | 86% | 2575 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 52,040 psi | 82% | 2907 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 35,346 psi | 55% | 2651 fps | 95.4% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 49,066 psi | 77% | 2815 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 41,930 psi | 66% | 2730 fps | 95.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 37,594 psi | 59% | 2654 fps | 96.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 39,914 psi | 63% | 2621 fps | 99.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,793 psi | 51% | 2477 fps | 99.2% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 50,154 psi | 79% | 2828 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 44,208 psi | 69% | 2789 fps | 99.2% |
| Somchem S335 | <<locked>> | 80% | 39,450 psi | 62% | 2621 fps | 99.9% |
| Somchem S341 | <<locked>> | 80% | 38,754 psi | 61% | 2671 fps | 96.6% |
| Somchem S355 | <<locked>> | 82% | 32,793 psi | 51% | 2552 fps | 95.2% |
| Somchem S365 | <<locked>> | 90% | 30,545 psi | 48% | 2582 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 45,339 psi | 71% | 2700 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 40,132 psi | 63% | 2621 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 35,331 psi | 55% | 2595 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 36,318 psi | 57% | 2598 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 80% | 29,196 psi | 46% | 2438 fps | 95.4% |
| Vihtavuori N160 | <<locked>> | 92% | 38,653 psi | 61% | 2707 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 41,060 psi | 64% | 2707 fps | 98.5% |
| Vihtavuori N540 | <<locked>> | 80% | 34,795 psi | 55% | 2579 fps | 98.8% |
| Vihtavuori N550 | <<locked>> | 94% | 40,422 psi | 63% | 2762 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 34,360 psi | 54% | 2575 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 40,176 psi | 63% | 2743 fps | 99% |
| Winchester StaBALL Match | <<locked>> | 80% | 36,883 psi | 58% | 2657 fps | 96.8% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 98 powders for .300 RCM loaded with the .308 | 150gr | Peregrine Plainsmaster (VLR-4). Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,146 fps; across all powders the maximum-charge window runs from 1,804 fps to 3,146 fps. Accurate 4350 gives the best case fill at 100 %, and 98 of the 98 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.308" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-17 reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. Alliant Power Pro 2000-MR, ReloadSwiss RS 52, ReloadSwiss RS 60 rank at the top here: for .300 RCM with the .308 | 150gr | Peregrine Plainsmaster (VLR-4) they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.