Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 150gr | Nosler Expansion Tip bullet and 94 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Hodgdon Superformance and Alliant Reloder-17.
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 2495 | <<locked>> | 84% | 52,272 psi | 86% | 3009 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 54,795 psi | 90% | 3074 fps | 97.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 47,268 psi | 78% | 3028 fps | 98.1% |
| Accurate 4064 | <<locked>> | 86% | 52,692 psi | 87% | 3064 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 53,156 psi | 87% | 3159 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 82% | 52,678 psi | 86% | 3097 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 53,954 psi | 89% | 3104 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 55,013 psi | 90% | 3205 fps | 97.1% |
| ADI Benchmark 8208 | <<locked>> | 82% | 54,955 psi | 90% | 3097 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 52,736 psi | 87% | 3228 fps | 99.9% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 54,839 psi | 90% | 3199 fps | 97.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 54,114 psi | 89% | 3123 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 54,520 psi | 90% | 3146 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 54,331 psi | 89% | 3228 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 51,880 psi | 85% | 3199 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 53,998 psi | 89% | 3189 fps | 97.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,759 psi | 73% | 3061 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,117 psi | 64% | 2949 fps | 96.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 50,966 psi | 84% | 3255 fps | 99.7% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 52,460 psi | 86% | 3110 fps | 99.8% |
| Bofors RP3 | <<locked>> | 88% | 54,882 psi | 90% | 3140 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 54,679 psi | 90% | 3117 fps | 98% |
| Hodgdon BL-C2 | <<locked>> | 82% | 54,491 psi | 89% | 3127 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 51,880 psi | 85% | 3094 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 92% | 52,286 psi | 86% | 3159 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 90% | 52,591 psi | 86% | 3120 fps | 97% |
| Hodgdon H4895 | <<locked>> | 82% | 53,229 psi | 87% | 3110 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 54,418 psi | 89% | 3143 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 53,026 psi | 87% | 3140 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 52,518 psi | 86% | 3192 fps | 98% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,694 psi | 59% | 1959 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 54,447 psi | 89% | 3114 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 53,359 psi | 88% | 3087 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 53,301 psi | 88% | 3084 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 52,808 psi | 87% | 3058 fps | 98.1% |
| IMR 4350 | <<locked>> | 94% | 51,996 psi | 85% | 3087 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 90% | 53,287 psi | 87% | 3094 fps | 98.2% |
| IMR 4831 | <<locked>> | 96% | 53,925 psi | 89% | 3156 fps | 99.9% |
| IMR 4895 | <<locked>> | 84% | 52,489 psi | 86% | 3123 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 54,955 psi | 90% | 3097 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 52,562 psi | 86% | 3068 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,100 psi | 90% | 3074 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 53,127 psi | 87% | 3077 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 52,837 psi | 87% | 3087 fps | 99.1% |
| Lovex S070 | <<locked>> | 94% | 53,766 psi | 88% | 3123 fps | 98.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 39,044 psi | 64% | 2861 fps | 96% |
| Norma 201 | <<locked>> | 84% | 54,636 psi | 90% | 3091 fps | 100% |
| Norma 202 | <<locked>> | 82% | 51,866 psi | 85% | 3038 fps | 100% |
| Norma 203B | <<locked>> | 86% | 53,751 psi | 88% | 3133 fps | 100% |
| Norma 204 | <<locked>> | 94% | 52,663 psi | 86% | 3140 fps | 96.5% |
| Norma MRPᴾ | <<locked>> | 100% | 50,285 psi | 83% | 3205 fps | 97.9% |
| Norma URP | <<locked>> | 94% | 52,228 psi | 86% | 3150 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 86% | 54,650 psi | 90% | 3159 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 54,984 psi | 90% | 3209 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,216 psi | 59% | 2005 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 52,286 psi | 86% | 3077 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 51,619 psi | 85% | 3156 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 51,474 psi | 85% | 3196 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 53,316 psi | 88% | 3189 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 52,257 psi | 86% | 3215 fps | 99.6% |
| Rottweil R 902 | <<locked>> | 84% | 51,909 psi | 85% | 3038 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 54,752 psi | 90% | 3133 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 52,895 psi | 87% | 3169 fps | 97% |
| Rottweil R 907 | <<locked>> | 92% | 54,679 psi | 90% | 3117 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 92% | 52,837 psi | 87% | 3087 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 82% | 52,562 psi | 86% | 3068 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 53,127 psi | 87% | 3077 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 53,766 psi | 88% | 3123 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 53,040 psi | 87% | 3143 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 53,606 psi | 88% | 3094 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 54,665 psi | 90% | 3123 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 52,576 psi | 86% | 2976 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 53,229 psi | 87% | 2976 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 52,794 psi | 87% | 3035 fps | 98.2% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 52,402 psi | 86% | 3159 fps | 96.9% |
| Somchem S335 | <<locked>> | 82% | 52,054 psi | 85% | 2969 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 53,374 psi | 88% | 3084 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 55,027 psi | 90% | 3130 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 54,708 psi | 90% | 3209 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 53,577 psi | 88% | 3143 fps | 97.9% |
| Vihtavuori N133 | <<locked>> | 82% | 53,040 psi | 87% | 2959 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 51,938 psi | 85% | 3002 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 52,576 psi | 86% | 3015 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 52,881 psi | 87% | 3051 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 54,592 psi | 90% | 3146 fps | 99.8% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 46,166 psi | 76% | 2992 fps | 95.9% |
| Vihtavuori N540 | <<locked>> | 86% | 54,128 psi | 89% | 3061 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 53,737 psi | 88% | 3150 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 49,748 psi | 82% | 3140 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 54,752 psi | 90% | 3117 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 52,504 psi | 86% | 3163 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,089 psi | 66% | 3091 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 54,737 psi | 90% | 3130 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 50,517 psi | 83% | 3077 fps | 96.2% |
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 2495 | <<locked>> | 80% | 45,658 psi | 75% | 2904 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 44,730 psi | 73% | 2887 fps | 95.6% |
| Accurate 3100 | <<locked>> | 94% | 38,130 psi | 63% | 2841 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 43,221 psi | 71% | 2904 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 32,184 psi | 53% | 2713 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 49,226 psi | 81% | 3038 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 41,771 psi | 69% | 2871 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 96% | 48,225 psi | 79% | 3077 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,372 psi | 84% | 3041 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,542 psi | 75% | 3087 fps | 99.4% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 48,124 psi | 79% | 3074 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,756 psi | 69% | 2897 fps | 99.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,773 psi | 74% | 2969 fps | 99.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 32,271 psi | 53% | 2733 fps | 95.5% |
| Alliant Reloder-17 | 64.1 gr | 80% | 36,361 psi | 60% | 2874 fps | 98.7% |
| Alliant Reloder-19 | <<locked>> | 96% | 47,456 psi | 78% | 3064 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 86% | 28,268 psi | 46% | 2635 fps | 95.3% |
| Alliant Reloder-25 | <<locked>> | 98% | 36,680 psi | 60% | 2884 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 90% | 35,114 psi | 58% | 2894 fps | 96% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,052 psi | 81% | 3048 fps | 99.5% |
| Bofors RP3 | <<locked>> | 80% | 41,698 psi | 68% | 2904 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 42,293 psi | 69% | 2877 fps | 95.1% |
| Hodgdon BL-C2 | <<locked>> | 80% | 50,908 psi | 84% | 3068 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,453 psi | 70% | 2913 fps | 98% |
| Hodgdon H414 | <<locked>> | 84% | 39,871 psi | 65% | 2904 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 86% | 46,093 psi | 76% | 2992 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 49,719 psi | 82% | 3048 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,660 psi | 49% | 2621 fps | 96.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,354 psi | 76% | 3025 fps | 100% |
| Hodgdon Superformance | 72.9 gr | 86% | 42,206 psi | 69% | 2982 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,629 psi | 44% | 1755 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,703 psi | 78% | 2995 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 50,082 psi | 82% | 3038 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,903 psi | 72% | 2910 fps | 99.2% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,354 psi | 76% | 2936 fps | 96.9% |
| IMR 4350 | <<locked>> | 88% | 42,989 psi | 71% | 2910 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 82% | 41,249 psi | 68% | 2854 fps | 95.3% |
| IMR 4831 | <<locked>> | 80% | 31,256 psi | 51% | 2671 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 45,905 psi | 75% | 3002 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 80% | 51,372 psi | 84% | 3041 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 49,023 psi | 80% | 3009 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,834 psi | 80% | 2966 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 43,976 psi | 72% | 2913 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 36,042 psi | 59% | 2736 fps | 95.3% |
| Lovex S070 | <<locked>> | 84% | 39,044 psi | 64% | 2828 fps | 95% |
| Lovex S071 | <<locked>> | 98% | 36,376 psi | 60% | 2799 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 48,037 psi | 79% | 2979 fps | 100% |
| Norma 202 | <<locked>> | 80% | 48,602 psi | 80% | 2986 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,121 psi | 72% | 2956 fps | 99.5% |
| Norma 204 | <<locked>> | 92% | 49,037 psi | 81% | 3071 fps | 95.7% |
| Norma MRP | <<locked>> | 94% | 40,799 psi | 67% | 3002 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 32,619 psi | 54% | 2723 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 44,251 psi | 73% | 2976 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 39,044 psi | 64% | 2894 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,006 psi | 44% | 1798 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,714 psi | 70% | 2894 fps | 96.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,022 psi | 79% | 3094 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 38,740 psi | 64% | 2946 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 34,606 psi | 57% | 2802 fps | 95.9% |
| ReloadSwiss RS 70 | 68.4 gr | 84% | 36,724 psi | 60% | 2874 fps | 96.1% |
| Rottweil R 902 | <<locked>> | 80% | 45,614 psi | 75% | 2927 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 39,189 psi | 64% | 2844 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 96% | 46,180 psi | 76% | 3041 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 84% | 42,293 psi | 69% | 2877 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,042 psi | 59% | 2736 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,023 psi | 80% | 3009 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,976 psi | 72% | 2913 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 84% | 39,044 psi | 64% | 2828 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,393 psi | 66% | 2897 fps | 98.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,053 psi | 82% | 3035 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,805 psi | 78% | 3005 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,197 psi | 81% | 2920 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,249 psi | 68% | 2776 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 40,321 psi | 66% | 2792 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 45,759 psi | 75% | 3038 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 48,892 psi | 80% | 2917 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,893 psi | 82% | 3025 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 39,798 psi | 65% | 2848 fps | 99.1% |
| Somchem S365 | <<locked>> | 80% | 29,124 psi | 48% | 2667 fps | 97.5% |
| Somchem S385 | <<locked>> | 94% | 43,787 psi | 72% | 2959 fps | 95.6% |
| Vihtavuori N133 | <<locked>> | 80% | 49,719 psi | 82% | 2910 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,629 psi | 75% | 2900 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,209 psi | 76% | 2913 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,014 psi | 62% | 2776 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 33,939 psi | 56% | 2726 fps | 95.8% |
| Vihtavuori N165 | <<locked>> | 98% | 43,178 psi | 71% | 2930 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 44,614 psi | 73% | 2900 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 33,533 psi | 55% | 2726 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 86% | 30,705 psi | 50% | 2713 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,620 psi | 55% | 2697 fps | 98% |
| Winchester 760 | <<locked>> | 84% | 39,871 psi | 65% | 2904 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 90% | 28,427 psi | 47% | 2723 fps | 96.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,732 psi | 78% | 3012 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 98% | 46,963 psi | 77% | 3012 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 94 powders for .300 Blaser Mag. loaded with the .308 | 150gr | Nosler Expansion Tip. Alliant Reloder-26 delivers the highest muzzle velocity at 3,255 fps; across all powders the maximum-charge window runs from 1,959 fps to 3,255 fps. Accurate 3100 gives the best case fill at 100 %, and 94 of the 94 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (420 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Power Pro Varmint 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. ReloadSwiss RS 70, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .300 Blaser Mag. with the .308 | 150gr | Nosler Expansion Tip 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.