Load Specifications
Bullet Manufacturer:Lapua
Bullet Weight:150 gr
Bullet Diameter:0.308"
Bullet Length:<<locked>>
Caliber:.300 Win. Mag. load data
Case Length (l3):2.62"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:90.5 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:24"
Max. allowed Pressure:62,366 psi
Recommended Twist Rate:1:11.0
Load data in caliber .300 Win. Mag. with .308 | 150gr | Lapua TRX N585 bullet and 95 powders. The key underlying parameters are shown in the table above.
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 2015 | <<locked>> | 82% | 55,463 psi | 89% | 2949 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 54,781 psi | 88% | 2976 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 56,173 psi | 90% | 3041 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 53,432 psi | 86% | 2972 fps | 96.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 45,716 psi | 73% | 2920 fps | 96.9% |
| Accurate 4064 | <<locked>> | 88% | 55,114 psi | 88% | 3028 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 55,187 psi | 88% | 3117 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 84% | 54,621 psi | 88% | 3054 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 90% | 55,927 psi | 90% | 3058 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 82% | 53,606 psi | 86% | 3002 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 54,882 psi | 88% | 2982 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 54,563 psi | 87% | 3179 fps | 99.8% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 52,939 psi | 85% | 3081 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 56,159 psi | 90% | 3081 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 53,200 psi | 85% | 3048 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 98% | 56,028 psi | 90% | 3176 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 92% | 53,795 psi | 86% | 3156 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 43,105 psi | 69% | 2949 fps | 99.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 48,863 psi | 78% | 3133 fps | 99% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 54,708 psi | 88% | 3068 fps | 99.6% |
| Bofors RP3 | <<locked>> | 88% | 53,330 psi | 86% | 3041 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 53,359 psi | 86% | 3012 fps | 97% |
| Hodgdon Benchmark | <<locked>> | 82% | 55,085 psi | 88% | 2986 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 53,272 psi | 85% | 3031 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 54,114 psi | 87% | 3054 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 94% | 54,085 psi | 87% | 3107 fps | 97.8% |
| Hodgdon H4350 | <<locked>> | 92% | 54,636 psi | 88% | 3071 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 84% | 55,245 psi | 89% | 3064 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 56,304 psi | 90% | 3097 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 55,230 psi | 89% | 3104 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 54,708 psi | 88% | 3146 fps | 97.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,853 psi | 57% | 1909 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 52,924 psi | 85% | 3012 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 55,593 psi | 89% | 3048 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 55,405 psi | 89% | 3041 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 86% | 55,027 psi | 88% | 3015 fps | 97.8% |
| IMR 4350 | <<locked>> | 96% | 53,766 psi | 86% | 3035 fps | 97.1% |
| IMR 4451 Enduron | <<locked>> | 92% | 55,013 psi | 88% | 3041 fps | 97.7% |
| IMR 4831 | <<locked>> | 98% | 55,680 psi | 89% | 3107 fps | 99.7% |
| IMR 4895 | <<locked>> | 86% | 54,592 psi | 88% | 3081 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 53,606 psi | 86% | 3002 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 54,853 psi | 88% | 3031 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 54,027 psi | 87% | 2979 fps | 99.9% |
| Lovex S062 | <<locked>> | 88% | 55,317 psi | 89% | 3038 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 54,752 psi | 88% | 3038 fps | 98.8% |
| Lovex S070 | <<locked>> | 96% | 55,912 psi | 90% | 3077 fps | 98.2% |
| Norma 201 | <<locked>> | 84% | 53,490 psi | 86% | 2999 fps | 100% |
| Norma 202 | <<locked>> | 84% | 54,215 psi | 87% | 3002 fps | 100% |
| Norma 203B | <<locked>> | 88% | 55,811 psi | 89% | 3087 fps | 100% |
| Norma 204 | <<locked>> | 96% | 54,491 psi | 87% | 3087 fps | 95.9% |
| Norma MRPᴾ | <<locked>> | 100% | 48,559 psi | 78% | 3084 fps | 96.5% |
| Norma URP | <<locked>> | 96% | 54,172 psi | 87% | 3100 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 86% | 52,837 psi | 85% | 3054 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 96% | 52,939 psi | 85% | 3094 fps | 98.3% |
| Ramshot TAC | <<locked>> | 82% | 53,693 psi | 86% | 3018 fps | 98.8% |
| Ramshot Wild Boar | <<locked>> | 82% | 53,708 psi | 86% | 3041 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,260 psi | 58% | 1952 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 54,317 psi | 87% | 3035 fps | 98.2% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 53,635 psi | 86% | 3114 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 53,505 psi | 86% | 3153 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 54,911 psi | 88% | 3136 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 54,012 psi | 87% | 3163 fps | 99.3% |
| Rottweil R 901 | <<locked>> | 82% | 54,346 psi | 87% | 2982 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 54,186 psi | 87% | 2999 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 53,403 psi | 86% | 3038 fps | 100% |
| Rottweil R 907 | <<locked>> | 92% | 53,359 psi | 86% | 3012 fps | 97% |
| Shooters World Long Rifle | <<locked>> | 94% | 54,752 psi | 88% | 3038 fps | 98.8% |
| Shooters World Match Rifle | <<locked>> | 84% | 54,853 psi | 88% | 3031 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 55,317 psi | 89% | 3038 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 55,912 psi | 90% | 3077 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 55,027 psi | 88% | 3097 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 56,159 psi | 90% | 3058 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 53,142 psi | 85% | 3022 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 54,592 psi | 88% | 2933 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 55,129 psi | 88% | 2933 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 54,839 psi | 88% | 2986 fps | 97.8% |
| Somchem S335 | <<locked>> | 84% | 54,244 psi | 87% | 2933 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 55,767 psi | 89% | 3048 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 53,679 psi | 86% | 3035 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 56,173 psi | 90% | 3159 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 51,924 psi | 83% | 3035 fps | 96.7% |
| Vihtavuori N133 | <<locked>> | 84% | 54,969 psi | 88% | 2920 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 54,027 psi | 87% | 2963 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 54,650 psi | 88% | 2979 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 54,969 psi | 88% | 3012 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 53,011 psi | 85% | 3041 fps | 99.3% |
| Vihtavuori N530 | <<locked>> | 82% | 53,911 psi | 86% | 2999 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 56,347 psi | 90% | 3022 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 55,506 psi | 89% | 3100 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 47,979 psi | 77% | 3035 fps | 99.3% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 52,808 psi | 85% | 3012 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 54,331 psi | 87% | 3054 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 54,331 psi | 87% | 3110 fps | 97.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,856 psi | 62% | 2969 fps | 99.5% |
| Winchester StaBALL Match | <<locked>> | 84% | 53,055 psi | 85% | 3028 fps | 100% |
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 52,098 psi | 84% | 2900 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 45,107 psi | 72% | 2822 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 52,562 psi | 84% | 2986 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 46,862 psi | 75% | 2851 fps | 95.2% |
| Accurate 3100 | <<locked>> | 96% | 39,755 psi | 64% | 2799 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 42,670 psi | 68% | 2818 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 33,939 psi | 54% | 2684 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 48,327 psi | 77% | 2943 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 80% | 41,075 psi | 66% | 2782 fps | 97.9% |
| ADI Benchmark 8208 | <<locked>> | 80% | 50,430 psi | 81% | 2949 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 51,358 psi | 82% | 2930 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,237 psi | 71% | 2979 fps | 98.6% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 49,705 psi | 80% | 3022 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,944 psi | 66% | 2805 fps | 99.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,961 psi | 70% | 2874 fps | 98.6% |
| Alliant Reloder-16 | <<locked>> | 82% | 33,924 psi | 54% | 2700 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 35,549 psi | 57% | 2772 fps | 97.6% |
| Alliant Reloder-23 | <<locked>> | 90% | 31,517 psi | 51% | 2654 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 92% | 36,622 psi | 59% | 2851 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 47,834 psi | 77% | 2946 fps | 98.9% |
| Bofors RP3 | <<locked>> | 80% | 40,901 psi | 66% | 2812 fps | 99.1% |
| Bofors RP7 | <<locked>> | 88% | 47,137 psi | 76% | 2894 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 51,880 psi | 83% | 2933 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 49,676 psi | 80% | 2972 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 41,510 psi | 67% | 2812 fps | 97% |
| Hodgdon H414 | <<locked>> | 88% | 44,338 psi | 71% | 2923 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 90% | 51,126 psi | 82% | 3009 fps | 95.8% |
| Hodgdon H4895 | <<locked>> | 80% | 48,849 psi | 78% | 2956 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,269 psi | 47% | 2536 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 44,947 psi | 72% | 2923 fps | 99.7% |
| Hodgdon Superformance | <<locked>> | 90% | 47,340 psi | 76% | 3009 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,687 psi | 43% | 1706 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,760 psi | 75% | 2904 fps | 99.6% |
| IMR 3031 | <<locked>> | 80% | 48,776 psi | 78% | 2943 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,134 psi | 69% | 2818 fps | 98.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,455 psi | 73% | 2838 fps | 95.7% |
| IMR 4350 | <<locked>> | 92% | 47,558 psi | 76% | 2927 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 86% | 45,730 psi | 73% | 2871 fps | 95.7% |
| IMR 4831 | <<locked>> | 84% | 35,041 psi | 56% | 2697 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 45,078 psi | 72% | 2907 fps | 99.2% |
| IMR 8208 XBR | <<locked>> | 80% | 50,430 psi | 81% | 2949 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 47,877 psi | 77% | 2920 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,863 psi | 77% | 2871 fps | 99.5% |
| Lovex S062 | <<locked>> | 80% | 43,149 psi | 69% | 2822 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 40,176 psi | 64% | 2759 fps | 95.7% |
| Lovex S070 | <<locked>> | 88% | 43,337 psi | 69% | 2844 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 47,224 psi | 76% | 2890 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 47,645 psi | 76% | 2897 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,352 psi | 70% | 2864 fps | 98.9% |
| Norma 204 | <<locked>> | 94% | 50,879 psi | 82% | 3025 fps | 95.1% |
| Norma MRP | <<locked>> | 98% | 45,136 psi | 72% | 3015 fps | 95.5% |
| Norma URP | <<locked>> | 82% | 34,171 psi | 55% | 2690 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 43,033 psi | 69% | 2874 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 88% | 40,553 psi | 65% | 2848 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 50,343 psi | 81% | 2956 fps | 98.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 50,111 psi | 80% | 2979 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,122 psi | 43% | 1749 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,858 psi | 67% | 2795 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 46,615 psi | 75% | 2986 fps | 99% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,840 psi | 61% | 2844 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 36,027 psi | 58% | 2762 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 38,276 psi | 61% | 2831 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 51,358 psi | 82% | 2933 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 45,020 psi | 72% | 2841 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 38,406 psi | 62% | 2749 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 88% | 47,137 psi | 76% | 2894 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 84% | 40,176 psi | 64% | 2759 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,877 psi | 77% | 2920 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,149 psi | 69% | 2822 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 43,337 psi | 69% | 2844 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,363 psi | 63% | 2799 fps | 98% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,965 psi | 79% | 2936 fps | 98.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,673 psi | 75% | 2907 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,312 psi | 77% | 2835 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,495 psi | 65% | 2690 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 45,136 psi | 72% | 2815 fps | 95.7% |
| Somchem S335 | <<locked>> | 80% | 48,066 psi | 77% | 2835 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 48,660 psi | 78% | 2930 fps | 99.5% |
| Somchem S355 | <<locked>> | 80% | 39,088 psi | 63% | 2756 fps | 98.4% |
| Somchem S365 | <<locked>> | 80% | 28,587 psi | 46% | 2572 fps | 96.3% |
| Somchem S385 | <<locked>> | 96% | 45,484 psi | 73% | 2913 fps | 95.1% |
| Vihtavuori N133 | <<locked>> | 80% | 48,704 psi | 78% | 2825 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,686 psi | 72% | 2815 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,150 psi | 72% | 2825 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,188 psi | 60% | 2684 fps | 99.1% |
| Vihtavuori N160 | <<locked>> | 82% | 35,549 psi | 57% | 2690 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 50,575 psi | 81% | 2946 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 43,584 psi | 70% | 2812 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 35,085 psi | 56% | 2690 fps | 95% |
| Vihtavuori N555 | <<locked>> | 88% | 32,126 psi | 52% | 2680 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,025 psi | 53% | 2608 fps | 96.9% |
| Winchester 748 | <<locked>> | 80% | 50,778 psi | 81% | 2995 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 44,527 psi | 71% | 2927 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 92% | 29,820 psi | 48% | 2680 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 46,456 psi | 74% | 2913 fps | 99.6% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 95 powders for .300 Win. Mag. loaded with the .308 | 150gr | Lapua TRX N585. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,179 fps; across all powders the maximum-charge window runs from 1,909 fps to 3,179 fps. Accurate 3100 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 (430 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.308" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Power Pro Varmint, 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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.