Load Specifications
Bullet Manufacturer:Peregrine
Bullet Weight:186 gr
Bullet Diameter:0.338"
Bullet Length:<<locked>>
Case Length (l3):2.724"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:124.89 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:27"
Max. allowed Pressure:69,618 psi
Recommended Twist Rate:1:13.5
Load data in caliber .338 Lapua Mag. Ackley Improved with .338 | 186gr | Peregrine VLR-5 bullet and 105 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Alliant Reloder-26 and Ramshot Grand.
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 2495 | <<locked>> | 82% | 60,568 psi | 87% | 3110 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 59,669 psi | 86% | 3163 fps | 99.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 62,468 psi | 90% | 3268 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 61,221 psi | 88% | 3176 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 59,785 psi | 86% | 3261 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 62,584 psi | 90% | 3392 fps | 98.2% |
| ADI APS 450 | <<locked>> | 84% | 62,801 psi | 90% | 2552 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 61,061 psi | 88% | 3222 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 61,017 psi | 88% | 3323 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 98% | 58,726 psi | 84% | 3323 fps | 98.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 45,701 psi | 66% | 3068 fps | 96.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 40,393 psi | 58% | 3015 fps | 98.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 62,221 psi | 89% | 3369 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 62,337 psi | 90% | 3241 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 62,569 psi | 90% | 3274 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 60,800 psi | 87% | 3323 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 62,685 psi | 90% | 3343 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 60,292 psi | 87% | 3307 fps | 99.6% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 62,468 psi | 90% | 3379 fps | 99.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 59,277 psi | 85% | 3281 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 51,097 psi | 73% | 3225 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 60,568 psi | 87% | 3389 fps | 100% |
| Baschieri & Pellagri 109ᴾ | <<locked>> | 100% | 60,916 psi | 88% | 3274 fps | 96.8% |
| Bofors RP15ᴾ | <<locked>> | 100% | 57,188 psi | 82% | 3297 fps | 99.4% |
| Bofors RP3 | <<locked>> | 84% | 59,741 psi | 86% | 3209 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 46,978 psi | 67% | 3143 fps | 97.4% |
| Bofors RP5ᴾ | <<locked>> | 100% | 62,468 psi | 90% | 3379 fps | 99.8% |
| Bofors RP7 | <<locked>> | 90% | 62,584 psi | 90% | 3264 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 46,963 psi | 67% | 3100 fps | 97.6% |
| Hodgdon H380 | <<locked>> | 84% | 60,031 psi | 86% | 3235 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 59,146 psi | 85% | 3281 fps | 100% |
| Hodgdon H4350 | <<locked>> | 92% | 62,961 psi | 90% | 3307 fps | 99.8% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 57,827 psi | 83% | 3245 fps | 98.2% |
| Hodgdon H4831 SC | <<locked>> | 98% | 61,627 psi | 89% | 3301 fps | 98.7% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 61,003 psi | 88% | 3228 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 62,134 psi | 89% | 3271 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 50,082 psi | 72% | 3287 fps | 99.4% |
| Hodgdon Superformance | <<locked>> | 88% | 59,001 psi | 85% | 3307 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,637 psi | 53% | 2031 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 60,466 psi | 87% | 3209 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 60,046 psi | 86% | 3173 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 59,857 psi | 86% | 3196 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 62,033 psi | 89% | 3238 fps | 100% |
| IMR 4350 | <<locked>> | 92% | 60,423 psi | 87% | 3245 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 88% | 60,437 psi | 87% | 3235 fps | 100% |
| IMR 4831 | <<locked>> | 96% | 61,192 psi | 88% | 3261 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 60,162 psi | 86% | 3245 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 59,640 psi | 86% | 3238 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 98% | 60,930 psi | 88% | 3369 fps | 99.2% |
| Lovex S060 | <<locked>> | 82% | 61,424 psi | 88% | 3179 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 60,626 psi | 87% | 3189 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 60,771 psi | 87% | 3225 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 62,656 psi | 90% | 3278 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 51,590 psi | 74% | 3110 fps | 99.9% |
| Norma 201 | <<locked>> | 82% | 61,772 psi | 89% | 3202 fps | 100% |
| Norma 202 | <<locked>> | 82% | 62,816 psi | 90% | 3192 fps | 100% |
| Norma 203B | <<locked>> | 84% | 61,815 psi | 89% | 3258 fps | 100% |
| Norma 204 | <<locked>> | 92% | 62,076 psi | 89% | 3310 fps | 99.6% |
| Norma MRP | <<locked>> | 98% | 62,758 psi | 90% | 3409 fps | 100% |
| Norma URP | <<locked>> | 92% | 62,120 psi | 89% | 3301 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 59,335 psi | 85% | 3228 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 61,177 psi | 88% | 3383 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 92% | 61,090 psi | 88% | 3307 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 62,961 psi | 90% | 3350 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,347 psi | 54% | 2077 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 59,814 psi | 86% | 3222 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 62,192 psi | 89% | 3330 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 60,147 psi | 86% | 3284 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 58,697 psi | 84% | 3320 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 50,807 psi | 73% | 3281 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 84% | 62,468 psi | 90% | 3199 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 59,973 psi | 86% | 3205 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 62,250 psi | 89% | 3287 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 96% | 59,712 psi | 86% | 3294 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 90% | 62,584 psi | 90% | 3264 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 90% | 60,771 psi | 87% | 3225 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 60,626 psi | 87% | 3189 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 62,656 psi | 90% | 3278 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 61,989 psi | 89% | 3271 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 62,033 psi | 89% | 3238 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 62,163 psi | 89% | 3117 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 60,017 psi | 86% | 3068 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 60,437 psi | 87% | 3176 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 59,234 psi | 85% | 3291 fps | 99.6% |
| Somchem S335 | <<locked>> | 82% | 61,917 psi | 89% | 3110 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 59,437 psi | 85% | 3199 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 60,481 psi | 87% | 3219 fps | 98.5% |
| Somchem S365 | <<locked>> | 94% | 62,584 psi | 90% | 3294 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 60,191 psi | 86% | 3261 fps | 99.9% |
| Unknown powder | <<locked>> | 90% | 62,511 psi | 90% | 3307 fps | 100% |
| Vihtavuori N133 | <<locked>> | 84% | 62,337 psi | 90% | 3087 fps | 100% |
| Vihtavuori N135 | <<locked>> | 82% | 59,451 psi | 85% | 3097 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 62,656 psi | 90% | 3156 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 61,438 psi | 88% | 3176 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 58,987 psi | 85% | 3212 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 57,798 psi | 83% | 3205 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 84% | 62,555 psi | 90% | 3186 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 59,408 psi | 85% | 3261 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 61,540 psi | 88% | 3307 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 62,961 psi | 90% | 3415 fps | 99.1% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 53,766 psi | 77% | 3235 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 60,307 psi | 87% | 3186 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 59,146 psi | 85% | 3281 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 56,869 psi | 82% | 3369 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 58,566 psi | 84% | 3225 fps | 99.4% |
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 2495 | <<locked>> | 80% | 56,695 psi | 81% | 3061 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,733 psi | 70% | 2986 fps | 98.7% |
| Accurate 3100 | <<locked>> | 80% | 30,835 psi | 44% | 2661 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 53,867 psi | 77% | 3074 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 42,018 psi | 60% | 2956 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 94% | 50,212 psi | 72% | 3186 fps | 95.7% |
| ADI APS 450 | <<locked>> | 80% | 58,668 psi | 84% | 2490 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 50,560 psi | 73% | 3061 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 37,898 psi | 54% | 2877 fps | 95% |
| ADI AR 2213 | <<locked>> | 90% | 44,483 psi | 64% | 3058 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 98% | 42,598 psi | 61% | 2999 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 94% | 33,069 psi | 48% | 2812 fps | 95.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 57,812 psi | 83% | 3307 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,547 psi | 74% | 3084 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 54,998 psi | 79% | 3163 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,524 psi | 58% | 2969 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 46,862 psi | 67% | 3100 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 37,695 psi | 54% | 2867 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 86% | 38,392 psi | 55% | 2927 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,776 psi | 43% | 2700 fps | 98.5% |
| Alliant Reloder-25 | <<locked>> | 84% | 29,762 psi | 43% | 2710 fps | 95.4% |
| Alliant Reloder-26 | 93.2 gr | 80% | 32,401 psi | 47% | 2831 fps | 97.5% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 53,751 psi | 77% | 3150 fps | 95.1% |
| Bofors RP15 | <<locked>> | 88% | 38,000 psi | 55% | 2913 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 52,156 psi | 75% | 3097 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 40,814 psi | 59% | 3009 fps | 95.6% |
| Bofors RP5 | <<locked>> | 86% | 38,392 psi | 55% | 2927 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 45,411 psi | 65% | 2969 fps | 98.2% |
| Hodgdon H1000 | <<locked>> | 96% | 40,886 psi | 59% | 2966 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 52,489 psi | 75% | 3117 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 47,979 psi | 69% | 3091 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 80% | 42,873 psi | 62% | 2949 fps | 97% |
| Hodgdon H4831 | <<locked>> | 92% | 44,121 psi | 63% | 2992 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 90% | 46,717 psi | 67% | 3045 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,000 psi | 55% | 2841 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 54,360 psi | 78% | 3159 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 38,072 psi | 55% | 2999 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 43,453 psi | 62% | 3028 fps | 98.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,340 psi | 39% | 1821 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 53,272 psi | 77% | 3100 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 56,362 psi | 81% | 3120 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,676 psi | 71% | 3035 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,457 psi | 70% | 3009 fps | 99.1% |
| IMR 4350 | <<locked>> | 80% | 40,959 psi | 59% | 2890 fps | 97.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,833 psi | 67% | 2999 fps | 98.8% |
| IMR 4831 | <<locked>> | 80% | 36,332 psi | 52% | 2812 fps | 98.8% |
| IMR 4895 | <<locked>> | 80% | 56,463 psi | 81% | 3192 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 43,279 psi | 62% | 2940 fps | 95% |
| IMR 7828 SSC | <<locked>> | 88% | 42,467 psi | 61% | 3025 fps | 95.3% |
| Lovex S060 | <<locked>> | 80% | 57,740 psi | 83% | 3130 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 53,447 psi | 77% | 3084 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,266 psi | 64% | 2943 fps | 99.3% |
| Lovex S070 | <<locked>> | 80% | 42,496 psi | 61% | 2927 fps | 98.3% |
| Lovex S071 | <<locked>> | 84% | 30,226 psi | 43% | 2641 fps | 95% |
| Norma 201 | <<locked>> | 80% | 57,986 psi | 83% | 3150 fps | 100% |
| Norma 202 | <<locked>> | 80% | 59,016 psi | 85% | 3140 fps | 100% |
| Norma 203B | <<locked>> | 80% | 54,360 psi | 78% | 3146 fps | 100% |
| Norma 204 | <<locked>> | 80% | 40,770 psi | 59% | 2923 fps | 95.9% |
| Norma MRP | 92.7 gr | 82% | 34,867 psi | 50% | 2867 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 41,495 psi | 60% | 2949 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 80% | 55,361 psi | 80% | 3169 fps | 100% |
| Ramshot Grand | 100.3 gr | 86% | 41,481 psi | 60% | 3012 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 40,480 psi | 58% | 2936 fps | 98.4% |
| Ramshot Magnum | <<locked>> | 86% | 35,955 psi | 52% | 2851 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,905 psi | 40% | 1864 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,330 psi | 75% | 3100 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 49,777 psi | 72% | 3153 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 42,047 psi | 60% | 2976 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,524 psi | 58% | 2992 fps | 99.3% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 34,940 psi | 50% | 2904 fps | 96% |
| Rottweil R 902 | <<locked>> | 80% | 55,230 psi | 79% | 3097 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 48,994 psi | 70% | 3038 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 41,945 psi | 60% | 2920 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 82% | 36,941 psi | 53% | 2851 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 45,411 psi | 65% | 2969 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,266 psi | 64% | 2943 fps | 99.3% |
| Shooters World Precision | <<locked>> | 80% | 53,447 psi | 77% | 3084 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,496 psi | 61% | 2927 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,647 psi | 73% | 3100 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 58,175 psi | 84% | 3182 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 58,479 psi | 84% | 3068 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,763 psi | 71% | 2923 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,381 psi | 62% | 2884 fps | 98.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 39,204 psi | 56% | 2907 fps | 95.8% |
| Somchem S335 | <<locked>> | 80% | 58,276 psi | 84% | 3061 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 49,110 psi | 71% | 3038 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 45,948 psi | 66% | 2966 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 38,232 psi | 55% | 2900 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 34,940 psi | 50% | 2769 fps | 95.2% |
| Unknown powder | <<locked>> | 80% | 44,730 psi | 64% | 3009 fps | 99.6% |
| Vihtavuori N133 | <<locked>> | 80% | 55,230 psi | 79% | 2995 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 55,898 psi | 80% | 3051 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 55,303 psi | 79% | 3058 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,105 psi | 60% | 2871 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 44,875 psi | 64% | 2976 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 86% | 35,969 psi | 52% | 2785 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 54,969 psi | 79% | 3084 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 45,455 psi | 65% | 3028 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 80% | 33,301 psi | 48% | 2782 fps | 98.4% |
| Vihtavuori N560 | <<locked>> | 90% | 44,295 psi | 64% | 3077 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 94% | 43,424 psi | 62% | 3038 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,293 psi | 61% | 2904 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,979 psi | 69% | 3091 fps | 99.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,295 psi | 38% | 2684 fps | 98.1% |
| Winchester Supreme 780 | <<locked>> | 82% | 37,550 psi | 54% | 2828 fps | 95.1% |
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 110 powders for .338 Lapua Mag. Ackley Improved loaded with the .338 | 186gr | Peregrine VLR-5. Vihtavuori N560 delivers the highest muzzle velocity at 3,415 fps; across all powders the maximum-charge window runs from 2,031 fps to 3,415 fps. Accurate 3100 gives the best case fill at 100 %, and 110 of the 110 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (480 MPa), the top charges use 51–90 %, leaving at least 10 % headroom. The 186.0 gr projectile in 0.338" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2217 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. Norma MRP, Alliant Reloder-26, Ramshot Grand rank at the top here: for .338 Lapua Mag. Ackley Improved with the .338 | 186gr | Peregrine VLR-5 they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, IMR 8133 Enduron, Vihtavuori N570 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.