Load Specifications
Bullet Manufacturer:Peregrine
Bullet Weight:180 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 | 180gr | Peregrine VLR-4 bullet and 106 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Ramshot Grand, Alliant Reloder-26 and Norma MRP.
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% | 59,234 psi | 85% | 3140 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 62,613 psi | 90% | 3248 fps | 99.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 60,814 psi | 87% | 3291 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 59,872 psi | 86% | 3205 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 62,569 psi | 90% | 3343 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 60,829 psi | 87% | 3409 fps | 97.6% |
| ADI APS 450 | <<locked>> | 84% | 62,729 psi | 90% | 2589 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 62,207 psi | 89% | 3297 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 59,872 psi | 86% | 3248 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 59,524 psi | 86% | 3343 fps | 99.4% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 61,438 psi | 88% | 3409 fps | 99% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 39,291 psi | 56% | 3022 fps | 97.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 60,669 psi | 87% | 3396 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 61,032 psi | 88% | 3271 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 61,264 psi | 88% | 3301 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 59,277 psi | 85% | 3346 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 61,076 psi | 88% | 3366 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 62,975 psi | 90% | 3389 fps | 99.7% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 60,800 psi | 87% | 3396 fps | 99.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 57,624 psi | 83% | 3304 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 49,661 psi | 71% | 3238 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 58,639 psi | 84% | 3409 fps | 100% |
| Baschieri & Pellagri 109ᴾ | <<locked>> | 100% | 59,698 psi | 86% | 3291 fps | 96.1% |
| Bofors RP15ᴾ | <<locked>> | 100% | 55,651 psi | 80% | 3314 fps | 99.1% |
| Bofors RP3 | <<locked>> | 86% | 62,511 psi | 90% | 3291 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 45,498 psi | 65% | 3150 fps | 96.7% |
| Bofors RP5ᴾ | <<locked>> | 100% | 60,800 psi | 87% | 3396 fps | 99.6% |
| Bofors RP7 | <<locked>> | 90% | 61,308 psi | 88% | 3287 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 45,730 psi | 66% | 3110 fps | 96.8% |
| Hodgdon H380 | <<locked>> | 86% | 62,772 psi | 90% | 3320 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 61,931 psi | 89% | 3366 fps | 100% |
| Hodgdon H4350 | <<locked>> | 92% | 61,598 psi | 88% | 3330 fps | 99.6% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 56,405 psi | 81% | 3258 fps | 97.6% |
| Hodgdon H4831 SC | <<locked>> | 98% | 60,118 psi | 86% | 3320 fps | 98.2% |
| Hodgdon H4895 | <<locked>> | 82% | 62,961 psi | 90% | 3307 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 59,509 psi | 85% | 3255 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 60,756 psi | 87% | 3297 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 48,660 psi | 70% | 3294 fps | 98.9% |
| Hodgdon Superformance | <<locked>> | 90% | 61,989 psi | 89% | 3392 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,535 psi | 52% | 2060 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 59,277 psi | 85% | 3238 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 62,743 psi | 90% | 3255 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 62,279 psi | 89% | 3274 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 60,887 psi | 87% | 3261 fps | 99.9% |
| IMR 4350 | <<locked>> | 92% | 59,117 psi | 85% | 3268 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 90% | 62,990 psi | 90% | 3314 fps | 100% |
| IMR 4831 | <<locked>> | 96% | 59,727 psi | 86% | 3287 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 62,888 psi | 90% | 3330 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 62,323 psi | 90% | 3320 fps | 98.6% |
| IMR 7828 SSC | <<locked>> | 98% | 59,292 psi | 85% | 3386 fps | 98.8% |
| Lovex S060 | <<locked>> | 82% | 60,336 psi | 87% | 3209 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 59,393 psi | 85% | 3219 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 59,524 psi | 86% | 3251 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 61,308 psi | 88% | 3301 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 50,183 psi | 72% | 3127 fps | 99.7% |
| Norma 201 | <<locked>> | 82% | 60,568 psi | 87% | 3232 fps | 100% |
| Norma 202 | <<locked>> | 82% | 61,583 psi | 88% | 3222 fps | 100% |
| Norma 203B | <<locked>> | 84% | 60,524 psi | 87% | 3284 fps | 100% |
| Norma 204 | <<locked>> | 92% | 60,626 psi | 87% | 3333 fps | 99.4% |
| Norma MRP | <<locked>> | 98% | 60,974 psi | 88% | 3428 fps | 100% |
| Norma URP | <<locked>> | 92% | 60,655 psi | 87% | 3323 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 62,105 psi | 89% | 3314 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 59,393 psi | 85% | 3396 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 92% | 59,611 psi | 86% | 3330 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 61,017 psi | 88% | 3366 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,217 psi | 53% | 2106 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 62,511 psi | 90% | 3304 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 60,495 psi | 87% | 3356 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 62,729 psi | 90% | 3366 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 61,467 psi | 88% | 3406 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 49,298 psi | 71% | 3291 fps | 99.7% |
| Rottweil R 902 | <<locked>> | 84% | 61,250 psi | 88% | 3228 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 62,569 psi | 90% | 3287 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 60,872 psi | 87% | 3307 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 98% | 62,381 psi | 90% | 3376 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 90% | 61,308 psi | 88% | 3287 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 90% | 59,524 psi | 86% | 3251 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 59,393 psi | 85% | 3219 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 61,308 psi | 88% | 3301 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 60,611 psi | 87% | 3297 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 60,800 psi | 87% | 3264 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 61,046 psi | 88% | 3146 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 62,758 psi | 90% | 3146 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 59,176 psi | 85% | 3202 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 61,888 psi | 89% | 3369 fps | 99.6% |
| Somchem S335 | <<locked>> | 82% | 60,800 psi | 87% | 3140 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 62,163 psi | 89% | 3281 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 59,132 psi | 85% | 3235 fps | 98% |
| Somchem S365 | <<locked>> | 94% | 60,916 psi | 88% | 3320 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 62,801 psi | 90% | 3340 fps | 99.9% |
| Unknown powder | <<locked>> | 90% | 61,076 psi | 88% | 3330 fps | 100% |
| Vihtavuori N133 | <<locked>> | 84% | 61,221 psi | 88% | 3120 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 62,120 psi | 89% | 3176 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 61,438 psi | 88% | 3186 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 60,133 psi | 86% | 3202 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 61,656 psi | 89% | 3291 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 56,333 psi | 81% | 3222 fps | 99.4% |
| Vihtavuori N540 | <<locked>> | 84% | 61,337 psi | 88% | 3215 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 62,004 psi | 89% | 3346 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 59,872 psi | 86% | 3333 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 61,250 psi | 88% | 3432 fps | 98.7% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 52,185 psi | 75% | 3251 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 58,885 psi | 85% | 3212 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 61,931 psi | 89% | 3366 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 54,781 psi | 79% | 3389 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 61,525 psi | 88% | 3310 fps | 99.5% |
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% | 55,434 psi | 80% | 3087 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,732 psi | 69% | 3005 fps | 98.2% |
| Accurate 3100 | <<locked>> | 82% | 32,082 psi | 46% | 2733 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 52,649 psi | 76% | 3100 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,872 psi | 59% | 2972 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 96% | 52,475 psi | 75% | 3264 fps | 95.9% |
| ADI APS 450 | <<locked>> | 80% | 58,610 psi | 84% | 2526 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 58,465 psi | 84% | 3245 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 49,545 psi | 71% | 3084 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 39,537 psi | 57% | 2953 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 90% | 43,366 psi | 62% | 3068 fps | 95% |
| ADI AR 2225 | <<locked>> | 96% | 34,418 psi | 49% | 2884 fps | 95.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 56,318 psi | 81% | 3330 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 50,430 psi | 72% | 3110 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 53,824 psi | 77% | 3189 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,508 psi | 57% | 2986 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 45,571 psi | 65% | 3123 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 39,378 psi | 57% | 2946 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 88% | 40,030 psi | 57% | 3005 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,935 psi | 42% | 2707 fps | 97.8% |
| Alliant Reloder-25 | <<locked>> | 86% | 31,024 psi | 45% | 2785 fps | 95.6% |
| Alliant Reloder-26 | 93.2 gr | 80% | 31,386 psi | 45% | 2838 fps | 96.7% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 55,985 psi | 80% | 3228 fps | 95.3% |
| Bofors RP15 | <<locked>> | 90% | 39,494 psi | 57% | 2989 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 50,937 psi | 73% | 3120 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 42,496 psi | 61% | 3084 fps | 95.8% |
| Bofors RP5 | <<locked>> | 88% | 40,030 psi | 57% | 3005 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 44,440 psi | 64% | 2989 fps | 97.7% |
| Hodgdon H1000 | <<locked>> | 98% | 42,612 psi | 61% | 3038 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 80% | 51,329 psi | 74% | 3140 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 46,804 psi | 67% | 3107 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 80% | 41,901 psi | 60% | 2969 fps | 96.4% |
| Hodgdon H4831 | <<locked>> | 94% | 46,137 psi | 66% | 3071 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 90% | 45,542 psi | 65% | 3058 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 59,146 psi | 85% | 3251 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,970 psi | 53% | 2861 fps | 99.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,113 psi | 76% | 3186 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 37,014 psi | 53% | 3002 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 42,250 psi | 61% | 3045 fps | 97.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,253 psi | 39% | 1847 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,214 psi | 75% | 3130 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 55,114 psi | 79% | 3150 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,660 psi | 70% | 3061 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,514 psi | 68% | 3031 fps | 98.7% |
| IMR 4350 | <<locked>> | 80% | 40,030 psi | 57% | 2907 fps | 96.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,890 psi | 66% | 3022 fps | 98.4% |
| IMR 4831 | <<locked>> | 80% | 35,375 psi | 51% | 2825 fps | 98.3% |
| IMR 4895 | <<locked>> | 80% | 55,259 psi | 79% | 3219 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 45,078 psi | 65% | 3012 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 90% | 44,367 psi | 64% | 3104 fps | 95.5% |
| Lovex S060 | <<locked>> | 80% | 56,695 psi | 81% | 3156 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 52,330 psi | 75% | 3114 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,294 psi | 62% | 2963 fps | 98.9% |
| Lovex S070 | <<locked>> | 80% | 41,524 psi | 60% | 2943 fps | 97.7% |
| Lovex S071 | <<locked>> | 86% | 31,357 psi | 45% | 2710 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 56,840 psi | 82% | 3176 fps | 100% |
| Norma 202 | <<locked>> | 80% | 57,841 psi | 83% | 3169 fps | 100% |
| Norma 203B | <<locked>> | 80% | 53,185 psi | 76% | 3173 fps | 100% |
| Norma 204 | <<locked>> | 80% | 39,755 psi | 57% | 2936 fps | 95.2% |
| Norma MRP | 95 gr | 84% | 36,492 psi | 52% | 2949 fps | 96% |
| Norma URP | <<locked>> | 80% | 40,437 psi | 58% | 2966 fps | 99.2% |
| Ramshot Big Game | <<locked>> | 80% | 54,099 psi | 78% | 3196 fps | 100% |
| Ramshot Grand | 102.6 gr | 88% | 43,482 psi | 62% | 3094 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 39,421 psi | 57% | 2953 fps | 97.8% |
| Ramshot Magnum | <<locked>> | 88% | 37,637 psi | 54% | 2930 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,804 psi | 40% | 1893 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 51,227 psi | 74% | 3123 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 48,399 psi | 70% | 3176 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,872 psi | 59% | 2992 fps | 99.2% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 39,465 psi | 57% | 3005 fps | 98.9% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 36,492 psi | 52% | 2982 fps | 96.3% |
| Rottweil R 902 | <<locked>> | 80% | 54,128 psi | 78% | 3127 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,848 psi | 69% | 3061 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 43,729 psi | 63% | 2995 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 84% | 38,479 psi | 55% | 2927 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 44,440 psi | 64% | 2989 fps | 97.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,294 psi | 62% | 2963 fps | 98.9% |
| Shooters World Precision | <<locked>> | 80% | 52,330 psi | 75% | 3114 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,524 psi | 60% | 2943 fps | 97.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 49,472 psi | 71% | 3123 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 56,985 psi | 82% | 3209 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 57,421 psi | 82% | 3097 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,776 psi | 70% | 2953 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,424 psi | 61% | 2904 fps | 97.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 38,130 psi | 55% | 2920 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 57,203 psi | 82% | 3091 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 48,022 psi | 69% | 3061 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 48,182 psi | 69% | 3045 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 37,086 psi | 53% | 2917 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 36,477 psi | 52% | 2844 fps | 95.4% |
| Unknown powder | <<locked>> | 80% | 43,642 psi | 63% | 3028 fps | 99.3% |
| Vihtavuori N133 | <<locked>> | 80% | 54,215 psi | 78% | 3025 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 54,723 psi | 79% | 3081 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 54,186 psi | 78% | 3087 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,147 psi | 59% | 2894 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,772 psi | 63% | 2995 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 88% | 37,449 psi | 54% | 2858 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 53,867 psi | 77% | 3110 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 44,367 psi | 64% | 3048 fps | 99.6% |
| Vihtavuori N555 | <<locked>> | 80% | 32,285 psi | 46% | 2795 fps | 97.8% |
| Vihtavuori N560 | <<locked>> | 92% | 46,195 psi | 66% | 3159 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 96% | 45,165 psi | 65% | 3114 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 41,249 psi | 59% | 2923 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 46,804 psi | 67% | 3107 fps | 98.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,527 psi | 37% | 2684 fps | 97.1% |
| Winchester Supreme 780 | <<locked>> | 84% | 39,276 psi | 56% | 2907 fps | 95.3% |
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 111 powders for .338 Lapua Mag. Ackley Improved loaded with the .338 | 180gr | Peregrine VLR-4. Vihtavuori N560 delivers the highest muzzle velocity at 3,432 fps; across all powders the maximum-charge window runs from 2,060 fps to 3,432 fps. Accurate 3100 gives the best case fill at 100 %, and 111 of the 111 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (480 MPa), the top charges use 50–90 %, leaving at least 10 % headroom. The 180.0 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 2213 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. Ramshot Grand, Alliant Reloder-26, Norma MRP rank at the top here: for .338 Lapua Mag. Ackley Improved with the .338 | 180gr | Peregrine VLR-4 they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, IMR 8133 Enduron, Norma 217, ReloadSwiss RS 80 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.