Load Specifications
Load data in caliber .338 Lapua Mag. Ackley Improved with .338 | 220gr | Peregrine VRG-3 bullet and 89 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Vihtavuori N560 and Accurate MAGPRO.
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: 27"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2700 | <<locked>> | 84% | 61,946 psi | 89% | 2982 fps | 100% |
| Accurate 3100 | <<locked>> | 96% | 62,453 psi | 90% | 3048 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 59,277 psi | 85% | 3022 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 62,453 psi | 90% | 3179 fps | 99.3% |
| ADI APS 450 | <<locked>> | 82% | 61,017 psi | 88% | 2343 fps | 100% |
| ADI AR 2208 | <<locked>> | 82% | 59,654 psi | 86% | 2972 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 60,582 psi | 87% | 3097 fps | 100% |
| ADI AR 2213 | <<locked>> | 96% | 62,729 psi | 90% | 3169 fps | 99.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,446 psi | 75% | 3005 fps | 99.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,963 psi | 67% | 2969 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 61,163 psi | 88% | 2992 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 60,568 psi | 87% | 3081 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 62,047 psi | 89% | 3091 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 59,799 psi | 86% | 3081 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 96% | 62,555 psi | 90% | 3156 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 96% | 59,843 psi | 86% | 3051 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 59,640 psi | 86% | 3127 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 61,046 psi | 88% | 3156 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 49,095 psi | 71% | 3018 fps | 96.2% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 59,640 psi | 86% | 3064 fps | 98.3% |
| Bofors RP15 | <<locked>> | 98% | 61,380 psi | 88% | 3140 fps | 100% |
| Bofors RP3 | <<locked>> | 82% | 62,729 psi | 90% | 3012 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 55,274 psi | 79% | 3077 fps | 99.8% |
| Bofors RP5 | <<locked>> | 96% | 62,555 psi | 90% | 3156 fps | 100% |
| Bofors RP7 | <<locked>> | 86% | 61,235 psi | 88% | 3025 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 53,969 psi | 78% | 3031 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 82% | 62,555 psi | 90% | 3041 fps | 100% |
| Hodgdon H414 | <<locked>> | 84% | 62,395 psi | 90% | 3100 fps | 100% |
| Hodgdon H4350 | <<locked>> | 88% | 62,033 psi | 89% | 3071 fps | 100% |
| Hodgdon H4831 | <<locked>> | 98% | 61,308 psi | 88% | 3084 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 94% | 60,930 psi | 88% | 3081 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 60,713 psi | 87% | 2992 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 58,479 psi | 84% | 3215 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 62,540 psi | 90% | 3130 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,173 psi | 53% | 1886 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 62,845 psi | 90% | 3009 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 62,265 psi | 89% | 2995 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 60,437 psi | 87% | 2992 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 59,553 psi | 86% | 3015 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 86% | 62,758 psi | 90% | 3045 fps | 100% |
| IMR 4831 | <<locked>> | 92% | 60,959 psi | 88% | 3028 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 62,526 psi | 90% | 3071 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 94% | 60,814 psi | 87% | 3150 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 42,250 psi | 61% | 2867 fps | 97.8% |
| Lovex S065 | <<locked>> | 86% | 59,669 psi | 86% | 2986 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 61,757 psi | 89% | 3041 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 59,379 psi | 85% | 3005 fps | 100% |
| Norma 204 | <<locked>> | 88% | 61,046 psi | 88% | 3081 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 42,482 psi | 61% | 2890 fps | 99.5% |
| Norma MRP | <<locked>> | 94% | 62,830 psi | 90% | 3176 fps | 100% |
| Norma URP | <<locked>> | 88% | 61,569 psi | 88% | 3058 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 61,076 psi | 88% | 3159 fps | 100% |
| Ramshot Hunter | <<locked>> | 88% | 60,481 psi | 87% | 3071 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 62,656 psi | 90% | 3123 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,000 psi | 55% | 1929 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 62,236 psi | 89% | 3031 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 61,670 psi | 89% | 3074 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 59,669 psi | 86% | 3048 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 62,656 psi | 90% | 3140 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 59,727 psi | 86% | 3209 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 54,476 psi | 78% | 3100 fps | 99.1% |
| Rottweil R 903 | <<locked>> | 84% | 62,975 psi | 90% | 3012 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 61,380 psi | 88% | 3061 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 92% | 59,495 psi | 85% | 3071 fps | 100% |
| Rottweil R 907 | <<locked>> | 86% | 61,235 psi | 88% | 3025 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 86% | 59,669 psi | 86% | 2986 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 61,757 psi | 89% | 3041 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 60,843 psi | 87% | 3025 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 62,091 psi | 89% | 2864 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 62,932 psi | 90% | 2995 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 59,059 psi | 85% | 3068 fps | 100% |
| Somchem S355 | <<locked>> | 84% | 62,294 psi | 89% | 3002 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 59,219 psi | 85% | 2995 fps | 99.4% |
| Somchem S365 | <<locked>> | 90% | 62,511 psi | 90% | 3054 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 59,785 psi | 86% | 3038 fps | 100% |
| Unknown powder | <<locked>> | 86% | 61,627 psi | 89% | 3061 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 60,553 psi | 87% | 2933 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 61,989 psi | 89% | 3022 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 61,554 psi | 88% | 3045 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 62,482 psi | 90% | 3074 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 61,917 psi | 89% | 3077 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 58,871 psi | 85% | 3133 fps | 99.6% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 62,308 psi | 90% | 3156 fps | 99.9% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 55,303 psi | 79% | 3104 fps | 98.8% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 52,765 psi | 76% | 3097 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 59,176 psi | 85% | 2946 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 62,395 psi | 90% | 3100 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 58,711 psi | 84% | 3146 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 61,844 psi | 89% | 3061 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 27"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2700 | <<locked>> | 80% | 54,259 psi | 78% | 2874 fps | 100% |
| Accurate 3100 | <<locked>> | 80% | 35,810 psi | 51% | 2602 fps | 98.8% |
| Accurate 4350 | <<locked>> | 80% | 48,124 psi | 69% | 2854 fps | 100% |
| Accurate MAGPRO | 99 gr | 86% | 43,584 psi | 63% | 2854 fps | 95.8% |
| ADI APS 450 | <<locked>> | 80% | 59,045 psi | 85% | 2316 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 56,057 psi | 81% | 2923 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 40,248 psi | 58% | 2740 fps | 97.8% |
| ADI AR 2213 | <<locked>> | 80% | 35,853 psi | 52% | 2664 fps | 95% |
| ADI AR 2217 | <<locked>> | 90% | 37,144 psi | 53% | 2697 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 86% | 29,211 psi | 42% | 2530 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 57,479 psi | 83% | 2943 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,427 psi | 67% | 2867 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 53,882 psi | 77% | 2982 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,205 psi | 58% | 2733 fps | 97.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 36,027 psi | 52% | 2674 fps | 96.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,621 psi | 50% | 2631 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,023 psi | 43% | 2546 fps | 97.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 38,392 psi | 55% | 2782 fps | 99.9% |
| Alliant Reloder-33 | <<locked>> | 98% | 45,411 psi | 65% | 2946 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 46,369 psi | 67% | 2828 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 33,446 psi | 48% | 2608 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 58,653 psi | 84% | 2963 fps | 100% |
| Bofors RP30 | <<locked>> | 86% | 33,736 psi | 48% | 2648 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 36,027 psi | 52% | 2674 fps | 96.7% |
| Bofors RP7 | <<locked>> | 80% | 50,531 psi | 73% | 2861 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 88% | 35,723 psi | 51% | 2664 fps | 96% |
| Hodgdon H380 | <<locked>> | 80% | 58,595 psi | 84% | 2986 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 54,302 psi | 78% | 2982 fps | 100% |
| Hodgdon H4350 | <<locked>> | 80% | 48,080 psi | 69% | 2851 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 84% | 38,595 psi | 55% | 2680 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 37,608 psi | 54% | 2657 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,569 psi | 63% | 2740 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 82% | 31,328 psi | 45% | 2628 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 49,966 psi | 72% | 2943 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,804 psi | 40% | 1686 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 59,030 psi | 85% | 2959 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 55,042 psi | 79% | 2897 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,563 psi | 77% | 2890 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,093 psi | 66% | 2795 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,040 psi | 75% | 2887 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 41,553 psi | 60% | 2723 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 39,972 psi | 57% | 2677 fps | 96% |
| IMR 7828 SSC | <<locked>> | 80% | 36,738 psi | 53% | 2700 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 94% | 34,403 psi | 49% | 2680 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 49,356 psi | 71% | 2831 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 47,790 psi | 69% | 2825 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 30,676 psi | 44% | 2474 fps | 97.2% |
| Norma 204 | <<locked>> | 80% | 46,369 psi | 67% | 2841 fps | 98.9% |
| Norma 217 | <<locked>> | 90% | 29,994 psi | 43% | 2582 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 37,840 psi | 54% | 2746 fps | 98.5% |
| Norma URP | <<locked>> | 80% | 47,268 psi | 68% | 2844 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,203 psi | 55% | 2749 fps | 96.5% |
| Ramshot Hunter | <<locked>> | 80% | 46,224 psi | 66% | 2848 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 33,170 psi | 48% | 2602 fps | 96.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,471 psi | 41% | 1729 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 58,175 psi | 84% | 2976 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 57,522 psi | 83% | 3022 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,399 psi | 70% | 2881 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,760 psi | 67% | 2904 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 82% | 30,327 psi | 44% | 2598 fps | 96.1% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 39,755 psi | 57% | 2822 fps | 95.6% |
| Rottweil R 903 | <<locked>> | 80% | 55,230 psi | 79% | 2910 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 41,466 psi | 60% | 2717 fps | 97% |
| Rottweil R 905 | <<locked>> | 80% | 39,581 psi | 57% | 2720 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 80% | 50,531 psi | 73% | 2861 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,356 psi | 71% | 2831 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 47,790 psi | 69% | 2825 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 56,985 psi | 82% | 2969 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,868 psi | 79% | 2776 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,341 psi | 69% | 2779 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,247 psi | 56% | 2713 fps | 97.7% |
| Somchem S355 | <<locked>> | 80% | 54,766 psi | 79% | 2904 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 42,235 psi | 61% | 2703 fps | 96.5% |
| Somchem S365 | <<locked>> | 80% | 44,469 psi | 64% | 2799 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,059 psi | 58% | 2700 fps | 98.5% |
| Unknown powder | <<locked>> | 80% | 50,517 psi | 73% | 2900 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 47,137 psi | 68% | 2743 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 50,720 psi | 73% | 2864 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 33,663 psi | 48% | 2546 fps | 96.4% |
| Vihtavuori N550 | <<locked>> | 80% | 51,300 psi | 74% | 2910 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 38,740 psi | 56% | 2707 fps | 100% |
| Vihtavuori N560 | 90.7 gr | 82% | 38,711 psi | 56% | 2756 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 86% | 38,290 psi | 55% | 2730 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 92% | 41,176 psi | 59% | 2841 fps | 95.5% |
| Vihtavuori N570 | <<locked>> | 98% | 48,965 psi | 70% | 3028 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,964 psi | 69% | 2792 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 54,302 psi | 78% | 2982 fps | 100% |
| Winchester StaBALL HD | 89.5 gr | 80% | 31,067 psi | 45% | 2661 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,958 psi | 57% | 2697 fps | 97.8% |
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 95 powders for .338 Lapua Mag. Ackley Improved loaded with the .338 | 220gr | Peregrine VRG-3. Hodgdon Retumbo delivers the highest muzzle velocity at 3,215 fps; across all powders the maximum-charge window runs from 1,886 fps to 3,215 fps. ADI AR 2217 gives the best case fill at 100 %, and 95 of the 95 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (480 MPa), the top charges use 53–90 %, leaving at least 10 % headroom. The 220.0 gr projectile in 0.338" calls for a 1:14.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2218, ADI AR 2225 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. Winchester StaBALL HD, Vihtavuori N560, Accurate MAGPRO rank at the top here: for .338 Lapua Mag. Ackley Improved with the .338 | 220gr | Peregrine VRG-3 they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, Alliant Reloder-50, Lovex D100 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.