Load Specifications
Load data in caliber .300 Blaser Mag. with .300 | 220gr | Berry's Spire Point bullet and 71 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, Winchester StaBALL HD and ReloadSwiss RS 76.
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: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 92% | 52,156 psi | 86% | 2615 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 53,592 psi | 88% | 2638 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 54,302 psi | 89% | 2762 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 90% | 54,143 psi | 89% | 2697 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 92% | 51,779 psi | 85% | 2700 fps | 99.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,705 psi | 82% | 2667 fps | 99.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,295 psi | 73% | 2638 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 54,346 psi | 89% | 2690 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 86% | 54,520 psi | 90% | 2687 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 53,795 psi | 88% | 2687 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 92% | 51,895 psi | 85% | 2700 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 53,345 psi | 88% | 2671 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 52,388 psi | 86% | 2730 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 53,287 psi | 87% | 2756 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 53,577 psi | 88% | 2667 fps | 97.1% |
| Bofors RP15 | <<locked>> | 96% | 54,549 psi | 90% | 2740 fps | 99.9% |
| Bofors RP30ᴾ | <<locked>> | 100% | 51,953 psi | 85% | 2733 fps | 99.5% |
| Bofors RP5 | <<locked>> | 92% | 51,895 psi | 85% | 2700 fps | 99.8% |
| Bofors RP7 | <<locked>> | 82% | 52,446 psi | 86% | 2589 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,911 psi | 90% | 2749 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 84% | 55,071 psi | 90% | 2690 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 54,143 psi | 89% | 2648 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 90% | 51,938 psi | 85% | 2648 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 92% | 54,244 psi | 89% | 2680 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 54,679 psi | 90% | 2615 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 54,839 psi | 90% | 2858 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 51,517 psi | 85% | 2674 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,260 psi | 61% | 1644 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 53,925 psi | 89% | 2628 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 53,809 psi | 88% | 2608 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 53,795 psi | 88% | 2631 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 53,069 psi | 87% | 2631 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 94% | 53,432 psi | 88% | 2736 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 39,958 psi | 66% | 2549 fps | 97.4% |
| Lovex S065 | <<locked>> | 84% | 54,520 psi | 90% | 2608 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 52,808 psi | 87% | 2608 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 53,330 psi | 88% | 2631 fps | 100% |
| Norma 204 | <<locked>> | 86% | 54,766 psi | 90% | 2684 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 40,074 psi | 66% | 2575 fps | 99.2% |
| Norma MRP | <<locked>> | 90% | 51,590 psi | 85% | 2720 fps | 100% |
| Norma URP | <<locked>> | 84% | 52,156 psi | 86% | 2621 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 54,085 psi | 89% | 2759 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 86% | 54,375 psi | 89% | 2680 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 52,069 psi | 85% | 2694 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,130 psi | 63% | 1683 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 53,447 psi | 88% | 2661 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 51,605 psi | 85% | 2687 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 51,488 psi | 85% | 2795 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 50,285 psi | 83% | 2753 fps | 98.5% |
| Rottweil R 904 | <<locked>> | 88% | 51,924 psi | 85% | 2615 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 90% | 53,374 psi | 88% | 2677 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 82% | 52,446 psi | 86% | 2589 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 54,520 psi | 90% | 2608 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 52,808 psi | 87% | 2608 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 53,621 psi | 88% | 2566 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 52,968 psi | 87% | 2674 fps | 99.8% |
| Somchem S361 | <<locked>> | 88% | 53,200 psi | 87% | 2612 fps | 98.8% |
| Somchem S365 | <<locked>> | 86% | 52,402 psi | 86% | 2625 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 53,693 psi | 88% | 2651 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 54,534 psi | 90% | 2549 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 53,838 psi | 88% | 2615 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 53,243 psi | 87% | 2635 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 84% | 52,866 psi | 87% | 2618 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 52,199 psi | 86% | 2651 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 51,517 psi | 85% | 2713 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 98% | 54,897 psi | 90% | 2753 fps | 99.4% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 51,547 psi | 85% | 2756 fps | 98.2% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 52,982 psi | 87% | 2575 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 51,706 psi | 85% | 2641 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 54,607 psi | 90% | 2802 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 53,534 psi | 88% | 2648 fps | 99.8% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 35,056 psi | 58% | 2320 fps | 98.8% |
| Accurate 4350 | <<locked>> | 80% | 46,862 psi | 77% | 2539 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 38,290 psi | 63% | 2474 fps | 95.1% |
| ADI AR 2209 | <<locked>> | 80% | 38,928 psi | 64% | 2431 fps | 97.7% |
| ADI AR 2213 | <<locked>> | 82% | 37,130 psi | 61% | 2425 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 90% | 35,766 psi | 59% | 2395 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 86% | 28,384 psi | 47% | 2254 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 39,160 psi | 64% | 2428 fps | 97.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,860 psi | 74% | 2543 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,102 psi | 64% | 2431 fps | 97.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 34,809 psi | 57% | 2379 fps | 96.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,533 psi | 55% | 2343 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,196 psi | 48% | 2267 fps | 97.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,724 psi | 60% | 2477 fps | 99.9% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 47,558 psi | 78% | 2566 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 32,489 psi | 53% | 2323 fps | 95.5% |
| Bofors RP30 | <<locked>> | 88% | 34,780 psi | 57% | 2411 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 34,809 psi | 57% | 2379 fps | 96.6% |
| Bofors RP7 | <<locked>> | 80% | 49,240 psi | 81% | 2536 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 86% | 34,229 psi | 56% | 2359 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 48,298 psi | 79% | 2585 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 80% | 50,836 psi | 83% | 2598 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 80% | 37,043 psi | 61% | 2375 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 82% | 38,899 psi | 64% | 2415 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,322 psi | 69% | 2434 fps | 100% |
| Hodgdon Retumbo | 62.1 gr | 82% | 30,458 psi | 50% | 2339 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 47,848 psi | 79% | 2615 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,891 psi | 46% | 1463 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,686 psi | 73% | 2480 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,575 psi | 83% | 2559 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 44,556 psi | 73% | 2490 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 38,827 psi | 64% | 2375 fps | 95.9% |
| IMR 7828 SSC | <<locked>> | 82% | 35,752 psi | 59% | 2405 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 96% | 35,041 psi | 58% | 2438 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 48,153 psi | 79% | 2513 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 46,586 psi | 76% | 2510 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 30,226 psi | 50% | 2208 fps | 97.5% |
| Norma 204 | <<locked>> | 80% | 44,715 psi | 73% | 2520 fps | 98.7% |
| Norma 217 | <<locked>> | 90% | 28,950 psi | 48% | 2303 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 36,448 psi | 60% | 2444 fps | 98.4% |
| Norma URP | <<locked>> | 80% | 45,832 psi | 75% | 2526 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 35,244 psi | 58% | 2408 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 44,556 psi | 73% | 2526 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 29,283 psi | 48% | 2244 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,558 psi | 47% | 1503 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,586 psi | 76% | 2559 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,788 psi | 74% | 2579 fps | 100% |
| ReloadSwiss RS 76 | 66.5 gr | 82% | 29,414 psi | 48% | 2313 fps | 95.9% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 37,521 psi | 62% | 2507 fps | 95% |
| Rottweil R 904 | <<locked>> | 80% | 40,335 psi | 66% | 2411 fps | 96.9% |
| Rottweil R 905 | <<locked>> | 80% | 38,363 psi | 63% | 2418 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 80% | 49,240 psi | 81% | 2536 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,153 psi | 79% | 2513 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 46,586 psi | 76% | 2510 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,210 psi | 78% | 2467 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,043 psi | 62% | 2411 fps | 97.6% |
| Somchem S361 | <<locked>> | 80% | 40,959 psi | 67% | 2405 fps | 96.3% |
| Somchem S365 | <<locked>> | 80% | 42,830 psi | 70% | 2484 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,885 psi | 64% | 2398 fps | 98.5% |
| Vihtavuori N150 | <<locked>> | 80% | 51,169 psi | 84% | 2507 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,340 psi | 78% | 2520 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 33,794 psi | 55% | 2287 fps | 96.8% |
| Vihtavuori N550 | <<locked>> | 80% | 46,615 psi | 77% | 2526 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 37,768 psi | 62% | 2411 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 36,651 psi | 60% | 2434 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 86% | 36,695 psi | 60% | 2428 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 94% | 41,887 psi | 69% | 2582 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,137 psi | 76% | 2480 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,486 psi | 80% | 2589 fps | 99.9% |
| Winchester StaBALL HD | 62.2 gr | 80% | 29,791 psi | 49% | 2372 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 35,447 psi | 58% | 2329 fps | 96.7% |
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 71 powders for .300 Blaser Mag. loaded with the .300 | 220gr | Berry's Spire Point. Hodgdon Retumbo delivers the highest muzzle velocity at 2,858 fps; across all powders the maximum-charge window runs from 1,644 fps to 2,858 fps. ADI AR 2217 gives the best case fill at 100 %, and 71 of the 71 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (420 MPa), the top charges use 61–90 %, leaving at least 10 % headroom. The 220.0 gr projectile in 0.308" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Bofors RP30 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. Hodgdon Retumbo, Winchester StaBALL HD, ReloadSwiss RS 76 rank at the top here: for .300 Blaser Mag. with the .300 | 220gr | Berry's Spire Point 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.