Load Specifications
Bullet Manufacturer:Ferrobull Europe
Bullet Weight:150 gr
Bullet Diameter:0.308"
Bullet Length:<<locked>>
Caliber:.300 H&H Mag. load data
Case Length (l3):2.85"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:85.9 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:24"
Max. allowed Pressure:62,366 psi
Recommended Twist Rate:1:12.5
Load data in caliber .300 H&H Mag. with .308 | 150gr | Ferrobull Entox Sport bullet and 94 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% | 54,868 psi | 88% | 2940 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 53,867 psi | 86% | 2963 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 55,724 psi | 89% | 3035 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 53,026 psi | 85% | 2963 fps | 96.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 45,063 psi | 72% | 2907 fps | 96.8% |
| Accurate 4064 | <<locked>> | 88% | 54,056 psi | 87% | 3015 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 54,737 psi | 88% | 3107 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 84% | 54,360 psi | 87% | 3048 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 90% | 55,492 psi | 89% | 3048 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 82% | 53,171 psi | 85% | 2995 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 54,447 psi | 87% | 2972 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 54,273 psi | 87% | 3169 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 55,796 psi | 89% | 3074 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 56,231 psi | 90% | 3097 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 98% | 55,956 psi | 90% | 3173 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 92% | 53,432 psi | 86% | 3146 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,714 psi | 68% | 2940 fps | 99.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 48,559 psi | 78% | 3123 fps | 98.9% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 54,433 psi | 87% | 3064 fps | 99.6% |
| Bofors RP3 | <<locked>> | 88% | 52,765 psi | 85% | 3031 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 56,260 psi | 90% | 3058 fps | 97.5% |
| Hodgdon Benchmark | <<locked>> | 82% | 54,694 psi | 88% | 2979 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 52,649 psi | 84% | 3018 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 53,635 psi | 86% | 3045 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 94% | 53,867 psi | 86% | 3100 fps | 97.8% |
| Hodgdon H4350 | <<locked>> | 92% | 54,273 psi | 87% | 3064 fps | 96.5% |
| Hodgdon H4895 | <<locked>> | 84% | 54,940 psi | 88% | 3058 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 55,883 psi | 90% | 3091 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 54,708 psi | 88% | 3094 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 54,389 psi | 87% | 3140 fps | 97.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,708 psi | 57% | 1909 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 56,072 psi | 90% | 3061 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 55,129 psi | 88% | 3041 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 54,911 psi | 88% | 3031 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 86% | 54,752 psi | 88% | 3012 fps | 97.8% |
| IMR 4350 | <<locked>> | 96% | 53,606 psi | 86% | 3031 fps | 97.1% |
| IMR 4451 Enduron | <<locked>> | 92% | 54,737 psi | 88% | 3035 fps | 97.7% |
| IMR 4831 | <<locked>> | 98% | 55,390 psi | 89% | 3100 fps | 99.7% |
| IMR 4895 | <<locked>> | 86% | 53,969 psi | 87% | 3068 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 82% | 53,171 psi | 85% | 2995 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 54,070 psi | 87% | 3018 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 53,650 psi | 86% | 2972 fps | 99.9% |
| Lovex S062 | <<locked>> | 88% | 54,882 psi | 88% | 3028 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 54,273 psi | 87% | 3031 fps | 98.8% |
| Lovex S070 | <<locked>> | 96% | 55,390 psi | 89% | 3068 fps | 98.1% |
| Norma 201 | <<locked>> | 86% | 56,405 psi | 90% | 3045 fps | 100% |
| Norma 202 | <<locked>> | 84% | 53,679 psi | 86% | 2992 fps | 100% |
| Norma 203B | <<locked>> | 88% | 55,419 psi | 89% | 3081 fps | 100% |
| Norma 204 | <<locked>> | 96% | 54,027 psi | 87% | 3077 fps | 95.9% |
| Norma MRPᴾ | <<locked>> | 100% | 48,182 psi | 77% | 3074 fps | 96.4% |
| Norma URP | <<locked>> | 96% | 53,722 psi | 86% | 3091 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 88% | 56,376 psi | 90% | 3107 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 56,420 psi | 90% | 3150 fps | 98.8% |
| Ramshot TAC | <<locked>> | 82% | 53,374 psi | 86% | 3009 fps | 98.8% |
| Ramshot Wild Boar | <<locked>> | 82% | 53,142 psi | 85% | 3028 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,042 psi | 58% | 1952 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 53,925 psi | 86% | 3028 fps | 98.2% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 53,287 psi | 85% | 3107 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 53,113 psi | 85% | 3143 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 54,563 psi | 87% | 3127 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 53,766 psi | 86% | 3156 fps | 99.3% |
| Rottweil R 901 | <<locked>> | 82% | 53,563 psi | 86% | 2969 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 53,505 psi | 86% | 2989 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 56,347 psi | 90% | 3081 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 56,260 psi | 90% | 3058 fps | 97.5% |
| Shooters World Long Rifle | <<locked>> | 94% | 54,273 psi | 87% | 3031 fps | 98.8% |
| Shooters World Match Rifle | <<locked>> | 84% | 54,070 psi | 87% | 3018 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 54,882 psi | 88% | 3028 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 55,390 psi | 89% | 3068 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 54,679 psi | 88% | 3087 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 55,695 psi | 89% | 3048 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 56,405 psi | 90% | 3074 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 54,157 psi | 87% | 2927 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 54,926 psi | 88% | 2930 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 54,244 psi | 87% | 2979 fps | 97.7% |
| Somchem S335 | <<locked>> | 84% | 53,650 psi | 86% | 2923 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 55,434 psi | 89% | 3038 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 52,968 psi | 85% | 3022 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 55,927 psi | 90% | 3153 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 51,503 psi | 83% | 3025 fps | 96.6% |
| Vihtavuori N133 | <<locked>> | 84% | 54,607 psi | 88% | 2913 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 53,447 psi | 86% | 2953 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 54,346 psi | 87% | 2972 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 54,534 psi | 87% | 3002 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 56,289 psi | 90% | 3091 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 82% | 53,635 psi | 86% | 2995 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 55,956 psi | 90% | 3015 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 55,230 psi | 89% | 3094 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 47,529 psi | 76% | 3025 fps | 99.2% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 56,420 psi | 90% | 3064 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 53,824 psi | 86% | 3045 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 54,114 psi | 87% | 3104 fps | 97.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,290 psi | 61% | 2949 fps | 99.4% |
| Winchester StaBALL Match | <<locked>> | 84% | 52,707 psi | 85% | 3022 fps | 100% |
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 51,532 psi | 83% | 2890 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 44,005 psi | 71% | 2805 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 51,837 psi | 83% | 2976 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 46,267 psi | 74% | 2841 fps | 95% |
| Accurate 3100 | <<locked>> | 96% | 39,117 psi | 63% | 2782 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 41,655 psi | 67% | 2799 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 35,650 psi | 57% | 2726 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 47,601 psi | 76% | 2930 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 80% | 40,466 psi | 65% | 2766 fps | 97.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,777 psi | 80% | 2936 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 50,691 psi | 81% | 2920 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 43,947 psi | 70% | 2972 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,350 psi | 65% | 2792 fps | 99% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,207 psi | 69% | 2858 fps | 98.5% |
| Alliant Reloder-16 | <<locked>> | 84% | 35,592 psi | 57% | 2746 fps | 95.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 34,969 psi | 56% | 2756 fps | 97.4% |
| Alliant Reloder-23 | <<locked>> | 90% | 30,806 psi | 49% | 2631 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 92% | 36,100 psi | 58% | 2835 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 47,311 psi | 76% | 2936 fps | 98.8% |
| Bofors RP3 | <<locked>> | 80% | 40,118 psi | 64% | 2792 fps | 99% |
| Bofors RP7 | <<locked>> | 88% | 46,485 psi | 75% | 2884 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 51,503 psi | 83% | 2927 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 49,240 psi | 79% | 2963 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 40,843 psi | 65% | 2795 fps | 96.8% |
| Hodgdon H414 | <<locked>> | 88% | 43,932 psi | 70% | 2913 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 90% | 50,807 psi | 81% | 3002 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 48,124 psi | 77% | 2943 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 30,618 psi | 49% | 2575 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 44,628 psi | 72% | 2913 fps | 99.6% |
| Hodgdon Superformance | <<locked>> | 90% | 46,804 psi | 75% | 2995 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,440 psi | 42% | 1706 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,340 psi | 74% | 2890 fps | 99.6% |
| IMR 3031 | <<locked>> | 80% | 48,298 psi | 77% | 2936 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,511 psi | 68% | 2805 fps | 98.4% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,991 psi | 72% | 2828 fps | 95.6% |
| IMR 4350 | <<locked>> | 92% | 47,166 psi | 76% | 2913 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 86% | 45,426 psi | 73% | 2864 fps | 95.6% |
| IMR 4831 | <<locked>> | 84% | 34,519 psi | 55% | 2680 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 44,309 psi | 71% | 2890 fps | 99.1% |
| IMR 8208 XBR | <<locked>> | 80% | 49,777 psi | 80% | 2936 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 47,152 psi | 76% | 2907 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,485 psi | 76% | 2864 fps | 99.5% |
| Lovex S062 | <<locked>> | 80% | 42,554 psi | 68% | 2808 fps | 99.5% |
| Lovex S065 | <<locked>> | 84% | 39,508 psi | 63% | 2743 fps | 95.5% |
| Lovex S070 | <<locked>> | 88% | 42,801 psi | 69% | 2831 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 46,572 psi | 75% | 2877 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 47,108 psi | 76% | 2884 fps | 100% |
| Norma 203B | <<locked>> | 80% | 42,554 psi | 68% | 2844 fps | 98.8% |
| Norma 204 | <<locked>> | 94% | 50,444 psi | 81% | 3015 fps | 95% |
| Norma MRP | <<locked>> | 98% | 44,730 psi | 72% | 3005 fps | 95.4% |
| Norma URP | <<locked>> | 84% | 35,853 psi | 57% | 2730 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 42,670 psi | 68% | 2864 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 88% | 40,074 psi | 64% | 2835 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 49,835 psi | 80% | 2946 fps | 98.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 49,763 psi | 80% | 2969 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,818 psi | 43% | 1745 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,234 psi | 66% | 2782 fps | 95.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 46,311 psi | 74% | 2979 fps | 99% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,275 psi | 60% | 2828 fps | 99.7% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 35,462 psi | 57% | 2743 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 37,782 psi | 61% | 2815 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 50,372 psi | 81% | 2917 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,135 psi | 71% | 2825 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 37,637 psi | 60% | 2733 fps | 98.3% |
| Rottweil R 907 | <<locked>> | 88% | 46,485 psi | 75% | 2884 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 84% | 39,508 psi | 63% | 2743 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,152 psi | 76% | 2907 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,554 psi | 68% | 2808 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 88% | 42,801 psi | 69% | 2831 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,972 psi | 62% | 2789 fps | 97.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,283 psi | 77% | 2920 fps | 98.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,354 psi | 74% | 2897 fps | 99.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,906 psi | 77% | 2828 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,016 psi | 64% | 2680 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 44,469 psi | 71% | 2802 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 47,471 psi | 76% | 2825 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 48,138 psi | 77% | 2917 fps | 99.5% |
| Somchem S355 | <<locked>> | 80% | 38,450 psi | 62% | 2740 fps | 98.3% |
| Somchem S365 | <<locked>> | 80% | 27,891 psi | 45% | 2546 fps | 95.8% |
| Somchem S385 | <<locked>> | 98% | 48,066 psi | 77% | 2963 fps | 95.8% |
| Vihtavuori N133 | <<locked>> | 80% | 48,370 psi | 78% | 2818 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,150 psi | 71% | 2805 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,614 psi | 72% | 2815 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,579 psi | 59% | 2667 fps | 98.9% |
| Vihtavuori N160 | <<locked>> | 82% | 34,969 psi | 56% | 2674 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 50,111 psi | 80% | 2936 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 43,004 psi | 69% | 2799 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 36,869 psi | 59% | 2730 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 90% | 33,663 psi | 54% | 2717 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,401 psi | 52% | 2589 fps | 96.7% |
| Winchester 748 | <<locked>> | 80% | 50,328 psi | 81% | 2986 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 44,092 psi | 71% | 2917 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 94% | 31,096 psi | 50% | 2726 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 45,919 psi | 74% | 2900 fps | 99.6% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 114 powders for .300 H&H Mag. loaded with the .308 | 150gr | Ferrobull Entox Sport. Alliant Reloder-16 delivers the highest muzzle velocity at 3,173 fps; across all powders the maximum-charge window runs from 1,909 fps to 3,173 fps. Accurate 3100 gives the best case fill at 100 %, and 114 of the 114 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 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate High Country, ADI AR 2209 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. As outliers, Accurate High Country, ADI AR 2213, Alliant Reloder-22 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.