Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 186gr | Peregrine Backup (VRG-2) bullet and 88 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP and Vihtavuori N560.
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.
A valid access license is required to use the Personalized Load Calculator.
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 2495 | <<locked>> | 82% | 56,188 psi | 90% | 2703 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 53,998 psi | 87% | 2733 fps | 99% |
| Accurate 3100ᴾ | <<locked>> | 100% | 55,999 psi | 90% | 2835 fps | 99.9% |
| Accurate 4064 | <<locked>> | 82% | 53,258 psi | 85% | 2713 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 54,288 psi | 87% | 2825 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 54,679 psi | 88% | 2923 fps | 96.7% |
| ADI AR 2208 | <<locked>> | 84% | 53,751 psi | 86% | 2753 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 55,651 psi | 89% | 2877 fps | 98.7% |
| ADI AR 2213 | <<locked>> | 98% | 53,142 psi | 85% | 2871 fps | 97.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 54,491 psi | 87% | 2772 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 54,549 psi | 87% | 2792 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,361 psi | 89% | 2884 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 52,953 psi | 85% | 2851 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 54,795 psi | 88% | 2861 fps | 98.7% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 55,970 psi | 90% | 2923 fps | 99% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 52,939 psi | 85% | 2848 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,759 psi | 73% | 2782 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 96% | 52,982 psi | 85% | 2933 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,213 psi | 82% | 2848 fps | 98.1% |
| Bofors RP3 | <<locked>> | 84% | 55,245 psi | 89% | 2789 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 55,970 psi | 90% | 2923 fps | 99% |
| Bofors RP7 | <<locked>> | 88% | 54,491 psi | 87% | 2779 fps | 99.2% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 45,382 psi | 73% | 2720 fps | 96.2% |
| Hodgdon H380 | <<locked>> | 84% | 55,448 psi | 89% | 2805 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 52,953 psi | 85% | 2825 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 88% | 56,188 psi | 90% | 2841 fps | 99% |
| Hodgdon H4831 | <<locked>> | 96% | 53,345 psi | 86% | 2815 fps | 96.7% |
| Hodgdon H4831 SC | <<locked>> | 98% | 55,811 psi | 89% | 2854 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 55,680 psi | 89% | 2805 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,802 psi | 72% | 2818 fps | 97.6% |
| Hodgdon Superformance | <<locked>> | 88% | 53,084 psi | 85% | 2861 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,535 psi | 59% | 1739 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 52,997 psi | 85% | 2733 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,506 psi | 89% | 2769 fps | 99.6% |
| IMR 4350 | <<locked>> | 92% | 55,724 psi | 89% | 2815 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,420 psi | 90% | 2808 fps | 99.6% |
| IMR 4831 | <<locked>> | 92% | 54,752 psi | 88% | 2818 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 55,985 psi | 90% | 2818 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 54,984 psi | 88% | 2808 fps | 97.2% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,230 psi | 87% | 2904 fps | 97.6% |
| Lovex S062 | <<locked>> | 82% | 53,272 psi | 85% | 2726 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,405 psi | 90% | 2802 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 54,259 psi | 87% | 2792 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,398 psi | 74% | 2687 fps | 99.1% |
| Norma 203B | <<locked>> | 82% | 53,853 psi | 86% | 2779 fps | 100% |
| Norma 204 | <<locked>> | 90% | 52,968 psi | 85% | 2812 fps | 98.2% |
| Norma MRP | <<locked>> | 98% | 55,753 psi | 89% | 2949 fps | 99.7% |
| Norma URP | <<locked>> | 90% | 53,214 psi | 85% | 2812 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 54,839 psi | 88% | 2808 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 54,868 psi | 88% | 2923 fps | 98.1% |
| Ramshot Hunter | <<locked>> | 92% | 55,622 psi | 89% | 2871 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,820 psi | 78% | 2792 fps | 98.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,043 psi | 59% | 1778 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,506 psi | 89% | 2795 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 56,318 psi | 90% | 2897 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 54,360 psi | 87% | 2851 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 52,721 psi | 85% | 2877 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,759 psi | 72% | 2815 fps | 98.6% |
| Rottweil R 902 | <<locked>> | 82% | 54,940 psi | 88% | 2733 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 55,332 psi | 89% | 2785 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 53,635 psi | 86% | 2792 fps | 97.5% |
| Rottweil R 905 | <<locked>> | 96% | 54,085 psi | 87% | 2851 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 88% | 54,491 psi | 87% | 2779 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,405 psi | 90% | 2802 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 53,272 psi | 85% | 2726 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 54,259 psi | 87% | 2792 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 53,417 psi | 86% | 2792 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,217 psi | 90% | 2667 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,086 psi | 90% | 2759 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 53,650 psi | 86% | 2844 fps | 98.6% |
| Somchem S355 | <<locked>> | 86% | 55,274 psi | 89% | 2779 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,216 psi | 89% | 2785 fps | 97% |
| Somchem S365 | <<locked>> | 94% | 56,434 psi | 90% | 2864 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 54,636 psi | 88% | 2825 fps | 99.2% |
| Vihtavuori N135 | <<locked>> | 82% | 55,535 psi | 89% | 2694 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,927 psi | 90% | 2713 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 53,113 psi | 85% | 2707 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,216 psi | 89% | 2808 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,070 psi | 87% | 2802 fps | 98.9% |
| Vihtavuori N540 | <<locked>> | 82% | 53,853 psi | 86% | 2707 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 54,404 psi | 87% | 2812 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 55,259 psi | 89% | 2874 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 55,970 psi | 90% | 2943 fps | 97.6% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 47,500 psi | 76% | 2785 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 54,969 psi | 88% | 2776 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 53,171 psi | 85% | 2828 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 48,428 psi | 78% | 2913 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 54,911 psi | 88% | 2822 fps | 98.6% |
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 2495 | <<locked>> | 80% | 52,518 psi | 84% | 2657 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 50,618 psi | 81% | 2680 fps | 98.5% |
| Accurate 3100 | <<locked>> | 84% | 32,126 psi | 52% | 2392 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 49,821 psi | 80% | 2664 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,232 psi | 61% | 2543 fps | 98.8% |
| Accurate MAGPRO | <<locked>> | 96% | 50,792 psi | 81% | 2861 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 47,340 psi | 76% | 2648 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 39,784 psi | 64% | 2589 fps | 95% |
| ADI AR 2213 | <<locked>> | 94% | 46,311 psi | 74% | 2746 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,950 psi | 77% | 2674 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,082 psi | 82% | 2740 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,391 psi | 60% | 2559 fps | 99% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,554 psi | 68% | 2680 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 39,624 psi | 64% | 2582 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 90% | 39,726 psi | 64% | 2628 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,151 psi | 44% | 2313 fps | 96.9% |
| Alliant Reloder-25 | <<locked>> | 88% | 30,951 psi | 50% | 2434 fps | 95.3% |
| Alliant Reloder-26 | 63.5 gr | 80% | 29,124 psi | 47% | 2421 fps | 95.3% |
| Bofors RP15 | <<locked>> | 94% | 41,930 psi | 67% | 2674 fps | 95.9% |
| Bofors RP3 | <<locked>> | 80% | 48,240 psi | 77% | 2684 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 39,726 psi | 64% | 2628 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 42,206 psi | 68% | 2562 fps | 97% |
| Hodgdon H1000 | <<locked>> | 98% | 42,351 psi | 68% | 2661 fps | 95.2% |
| Hodgdon H380 | <<locked>> | 80% | 48,559 psi | 78% | 2697 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 80% | 40,480 psi | 65% | 2595 fps | 97.2% |
| Hodgdon H4350 | <<locked>> | 80% | 43,424 psi | 70% | 2618 fps | 96.6% |
| Hodgdon H4831 | <<locked>> | 92% | 46,485 psi | 75% | 2700 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 94% | 48,660 psi | 78% | 2740 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,867 psi | 56% | 2451 fps | 99.3% |
| Hodgdon Retumbo | <<locked>> | 96% | 39,175 psi | 63% | 2687 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 39,262 psi | 63% | 2605 fps | 96.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,224 psi | 44% | 1552 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,821 psi | 80% | 2684 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,054 psi | 83% | 2717 fps | 99.2% |
| IMR 4350 | <<locked>> | 80% | 37,971 psi | 61% | 2490 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,772 psi | 70% | 2592 fps | 97.8% |
| IMR 4831 | <<locked>> | 80% | 36,753 psi | 59% | 2497 fps | 98.6% |
| IMR 4895 | <<locked>> | 80% | 52,402 psi | 84% | 2766 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 48,283 psi | 77% | 2694 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 94% | 44,324 psi | 71% | 2720 fps | 95.1% |
| Lovex S062 | <<locked>> | 80% | 49,908 psi | 80% | 2674 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,089 psi | 66% | 2539 fps | 98.4% |
| Lovex S070 | <<locked>> | 80% | 39,421 psi | 63% | 2523 fps | 97.1% |
| Lovex S071 | <<locked>> | 88% | 31,212 psi | 50% | 2369 fps | 95% |
| Norma 203B | <<locked>> | 80% | 50,430 psi | 81% | 2726 fps | 100% |
| Norma 204 | <<locked>> | 82% | 40,176 psi | 64% | 2575 fps | 95.1% |
| Norma MRP | 66.2 gr | 86% | 36,260 psi | 58% | 2579 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 38,203 psi | 61% | 2543 fps | 98.7% |
| Ramshot Big Game | <<locked>> | 80% | 51,111 psi | 82% | 2753 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 44,063 psi | 71% | 2730 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 37,101 psi | 59% | 2530 fps | 97% |
| Ramshot Magnum | <<locked>> | 94% | 38,986 psi | 63% | 2605 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,746 psi | 44% | 1591 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,573 psi | 78% | 2684 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,266 psi | 73% | 2730 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,261 psi | 61% | 2566 fps | 98.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,043 psi | 59% | 2575 fps | 98.1% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 35,998 psi | 58% | 2605 fps | 95.4% |
| Rottweil R 902 | <<locked>> | 80% | 51,648 psi | 83% | 2687 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,368 psi | 73% | 2631 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 44,092 psi | 71% | 2625 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 86% | 38,638 psi | 62% | 2566 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 42,206 psi | 68% | 2562 fps | 97% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,089 psi | 66% | 2539 fps | 98.4% |
| Shooters World Precision | <<locked>> | 80% | 49,908 psi | 80% | 2674 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,421 psi | 63% | 2523 fps | 97.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,804 psi | 75% | 2687 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,586 psi | 75% | 2536 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,364 psi | 65% | 2490 fps | 97.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 40,843 psi | 65% | 2615 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 45,542 psi | 73% | 2628 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 48,138 psi | 77% | 2671 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 34,592 psi | 55% | 2497 fps | 99.9% |
| Somchem S385 | <<locked>> | 84% | 36,666 psi | 59% | 2493 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 80% | 52,098 psi | 84% | 2648 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,388 psi | 84% | 2664 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,656 psi | 70% | 2559 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,552 psi | 63% | 2539 fps | 99% |
| Vihtavuori N165 | <<locked>> | 90% | 38,595 psi | 62% | 2530 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 50,517 psi | 81% | 2657 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,943 psi | 62% | 2543 fps | 98.7% |
| Vihtavuori N555 | <<locked>> | 80% | 30,139 psi | 48% | 2388 fps | 97% |
| Vihtavuori N560 | 72.4 gr | 94% | 48,617 psi | 78% | 2818 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 98% | 44,309 psi | 71% | 2726 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,638 psi | 62% | 2510 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 40,480 psi | 65% | 2595 fps | 97.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 23,931 psi | 38% | 2280 fps | 95.5% |
| Winchester Supreme 780 | <<locked>> | 90% | 41,263 psi | 66% | 2589 fps | 95.6% |
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 88 powders for .300 Win. Mag. loaded with the .308 | 186gr | Peregrine Backup (VRG-2). Norma MRP delivers the highest muzzle velocity at 2,949 fps; across all powders the maximum-charge window runs from 1,739 fps to 2,949 fps. Accurate 3100 gives the best case fill at 100 %, and 88 of the 88 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 186.0 gr projectile in 0.308" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-22, Alliant Reloder-23 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 Reloder-26, Norma MRP, Vihtavuori N560 rank at the top here: for .300 Win. Mag. with the .308 | 186gr | Peregrine Backup (VRG-2) 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.