Load data for .300 H&H Mag. + .308 | 135gr | Sierra HPBT MatchKing

.300 H&H Mag. cartridge drawing
Sierra logo

Load Specifications

Bullet Manufacturer:Sierra
Bullet Weight:135 gr
Bullet Diameter:0.308"
Bullet Length:<<locked>>
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:1:15.0

Load data in caliber .300 H&H Mag. with .308 | 135gr | Sierra HPBT MatchKing bullet and 93 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.

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You can find more information in our FAQ: How can I use the Personalized Load Calculator?

Max Load - Barrel Length: 24"

PowderChargeFRMaxP%V(0)z
Accurate 2015<<locked>>82%53,098 psi85%3054 fps100%
Accurate 2495<<locked>>88%55,390 psi89%3127 fps100%
Accurate 2520<<locked>>82%53,403 psi86%3140 fps100%
Accurate 2700<<locked>>88%54,491 psi87%3110 fps95.8%
Accurate 4064<<locked>>90%55,579 psi89%3176 fps100%
Accurate 4350<<locked>>98%55,811 psi89%3258 fps99.1%
ADI AR 2206H<<locked>>86%55,709 psi89%3209 fps99.7%
ADI AR 2208<<locked>>90%53,403 psi86%3150 fps99.2%
ADI Benchmark 8208<<locked>>84%54,578 psi88%3156 fps100%
Alliant AR-Comp<<locked>>84%55,593 psi89%3140 fps100%
Alliant Power Pro 2000-MR<<locked>>88%55,564 psi89%3330 fps99.5%
Alliant Reloder- TS 15.5<<locked>>90%53,316 psi85%3169 fps99.9%
Alliant Reloder-15<<locked>>88%54,056 psi87%3196 fps99.4%
Alliant Reloder-16<<locked>>98%53,229 psi85%3258 fps99.2%
Alliant Reloder-17<<locked>>94%54,418 psi87%3297 fps99.9%
Alliant Reloder-23ᴾ<<locked>>100%40,669 psi65%3009 fps98%
Alliant Reloder-26ᴾ<<locked>>100%45,948 psi74%3186 fps97.3%
Baschieri & Pellagri 107<<locked>>86%55,622 psi89%3215 fps99.2%
Bofors RP3<<locked>>90%54,172 psi87%3189 fps99.9%
Bofors RP7<<locked>>94%54,114 psi87%3146 fps96%
Hodgdon Benchmark<<locked>>84%56,101 psi90%3140 fps100%
Hodgdon BL-C2<<locked>>84%54,027 psi87%3179 fps100%
Hodgdon CFE223<<locked>>82%56,144 psi90%3291 fps99.5%
Hodgdon H380<<locked>>90%55,042 psi88%3199 fps98.7%
Hodgdon H414<<locked>>96%54,708 psi88%3245 fps96.8%
Hodgdon H4895<<locked>>86%56,333 psi90%3222 fps99.9%
Hodgdon Hybrid 100Vᴾ<<locked>>100%52,881 psi85%3179 fps99.8%
Hodgdon LEVERevolution<<locked>>88%56,014 psi90%3255 fps100%
Hodgdon Superformance<<locked>>96%55,579 psi89%3281 fps96.6%
Hodgdon TrailBossᴾ<<locked>>100%35,520 psi57%2008 fps100%
Hodgdon VARGET<<locked>>86%54,056 psi87%3166 fps99.8%
IMR 3031<<locked>>86%56,231 psi90%3205 fps100%
IMR 4064<<locked>>90%56,260 psi90%3189 fps99.6%
IMR 4166 Enduron<<locked>>88%56,115 psi90%3163 fps97%
IMR 4350<<locked>>98%54,607 psi88%3176 fps96.2%
IMR 4451 Enduron<<locked>>94%56,115 psi90%3186 fps96.9%
IMR 4831ᴾ<<locked>>100%56,289 psi90%3248 fps99.3%
IMR 4895<<locked>>88%55,448 psi89%3232 fps99.7%
IMR 8208 XBR<<locked>>84%54,578 psi88%3156 fps100%
Lovex D073.6<<locked>>86%55,608 psi89%3182 fps100%
Lovex S060<<locked>>86%54,940 psi88%3127 fps99.7%
Lovex S062<<locked>>90%56,014 psi90%3182 fps100%
Lovex S065<<locked>>96%55,390 psi89%3176 fps98.1%
Lovex S070<<locked>>96%53,040 psi85%3153 fps96.7%
Norma 201<<locked>>86%54,389 psi87%3150 fps100%
Norma 202<<locked>>86%54,868 psi88%3153 fps100%
Norma 203B<<locked>>88%53,272 psi85%3182 fps99.6%
Norma URP<<locked>>98%54,665 psi88%3241 fps99%
Ramshot Big Game<<locked>>88%53,766 psi86%3202 fps99.5%
Ramshot Hunter<<locked>>98%53,417 psi86%3225 fps97.5%
Ramshot TAC<<locked>>84%54,998 psi88%3166 fps98.2%
Ramshot Wild Boar<<locked>>84%54,694 psi88%3189 fps99.6%
Ramshot X-Terminator<<locked>>82%55,405 psi89%3153 fps99.6%
ReloadSwiss RS 14ᴾ<<locked>>100%36,027 psi58%2054 fps100%
ReloadSwiss RS 50<<locked>>90%55,230 psi89%3176 fps97.5%
ReloadSwiss RS 52<<locked>>86%54,230 psi87%3261 fps99.3%
ReloadSwiss RS 60<<locked>>92%54,215 psi87%3304 fps100%
ReloadSwiss RS 62<<locked>>98%55,434 psi89%3274 fps99%
ReloadSwiss RS 70<<locked>>98%54,969 psi88%3304 fps98.7%
Rottweil R 901<<locked>>84%55,303 psi89%3136 fps100%
Rottweil R 902<<locked>>88%54,882 psi88%3146 fps100%
Rottweil R 903<<locked>>92%54,027 psi87%3179 fps99.8%
Rottweil R 907<<locked>>94%54,114 psi87%3146 fps96%
Shooters World Long Rifle<<locked>>96%55,390 psi89%3176 fps98.1%
Shooters World Match Rifle<<locked>>86%55,608 psi89%3182 fps100%
Shooters World Precision<<locked>>90%56,014 psi90%3182 fps100%
Shooters World SW4350<<locked>>96%53,040 psi85%3153 fps96.7%
SNPE Vectan SP 11<<locked>>92%55,695 psi89%3241 fps99.7%
SNPE Vectan SP 7<<locked>>84%53,345 psi86%3140 fps98.4%
SNPE Vectan SP 9<<locked>>86%54,056 psi87%3169 fps99.6%
SNPE Vectan Tubal 3000<<locked>>86%55,695 psi89%3091 fps100%
SNPE Vectan Tubal 5000<<locked>>92%56,130 psi90%3084 fps100%
SNPE Vectan Tubal 7000<<locked>>96%55,724 psi89%3123 fps96.9%
Somchem S321<<locked>>82%55,825 psi90%3186 fps100%
Somchem S335<<locked>>86%55,245 psi89%3084 fps100%
Somchem S341<<locked>>84%52,924 psi85%3130 fps99.5%
Somchem S355<<locked>>92%54,186 psi87%3176 fps99.8%
Somchem S365ᴾ<<locked>>100%52,576 psi84%3245 fps100%
Vihtavuori N130<<locked>>82%55,332 psi89%3051 fps100%
Vihtavuori N133<<locked>>86%55,956 psi90%3074 fps100%
Vihtavuori N135<<locked>>88%54,650 psi88%3117 fps100%
Vihtavuori N140<<locked>>88%55,405 psi89%3130 fps100%
Vihtavuori N150<<locked>>94%55,666 psi89%3153 fps100%
Vihtavuori N160<<locked>>96%53,563 psi86%3182 fps98.8%
Vihtavuori N530<<locked>>84%55,129 psi88%3156 fps100%
Vihtavuori N540<<locked>>88%53,838 psi86%3120 fps100%
Vihtavuori N550<<locked>>98%56,130 psi90%3241 fps99%
Vihtavuori N555ᴾ<<locked>>100%44,860 psi72%3097 fps98%
Winchester 6.5 StaBALL<<locked>>96%53,896 psi86%3156 fps99.9%
Winchester 748<<locked>>84%55,158 psi88%3205 fps100%
Winchester 760<<locked>>96%54,955 psi88%3251 fps96.9%
Winchester StaBALL HDᴾ<<locked>>100%36,608 psi59%2999 fps97.6%
Winchester StaBALL Match<<locked>>86%53,983 psi87%3176 fps99.8%

Start Load - Barrel Length: 24"

PowderChargeFRMaxP%V(0)z
Accurate 2015<<locked>>80%49,690 psi80%3002 fps100%
Accurate 2495<<locked>>80%42,554 psi68%2910 fps100%
Accurate 2520<<locked>>80%49,777 psi80%3077 fps100%
Accurate 2700<<locked>>86%50,923 psi82%3048 fps95%
Accurate 4064<<locked>>80%40,205 psi64%2897 fps99.9%
Accurate 4350<<locked>>88%39,291 psi63%2933 fps95.6%
ADI AR 2206H<<locked>>80%45,919 psi74%3025 fps98.5%
ADI AR 2208<<locked>>80%39,073 psi63%2851 fps96.2%
ADI Benchmark 8208<<locked>>80%47,993 psi77%3035 fps99.6%
Alliant AR-Comp<<locked>>80%48,573 psi78%3031 fps100%
Alliant Power Pro 2000-MR<<locked>>80%42,018 psi67%3048 fps96.9%
Alliant Reloder- TS 15.5<<locked>>80%38,885 psi62%2877 fps97.8%
Alliant Reloder-15<<locked>>80%41,626 psi67%2946 fps97.1%
Alliant Reloder-16<<locked>>88%38,856 psi62%2943 fps95.6%
Alliant Reloder-17<<locked>>80%33,591 psi54%2825 fps95.4%
Alliant Reloder-23<<locked>>94%33,707 psi54%2822 fps95.3%
Alliant Reloder-26<<locked>>96%39,682 psi64%3035 fps95.1%
Baschieri & Pellagri 107<<locked>>80%45,310 psi73%3025 fps97.5%
Bofors RP3<<locked>>80%38,638 psi62%2881 fps97.8%
Bofors RP7<<locked>>92%50,952 psi82%3091 fps95.2%
Hodgdon Benchmark<<locked>>80%49,617 psi80%3028 fps99.9%
Hodgdon BL-C2<<locked>>80%47,224 psi76%3058 fps99.8%
Hodgdon CFE223<<locked>>80%52,286 psi84%3222 fps99.2%
Hodgdon H380<<locked>>80%39,363 psi63%2881 fps95%
Hodgdon H414<<locked>>92%47,935 psi77%3117 fps95.2%
Hodgdon H4895<<locked>>80%46,340 psi74%3038 fps99%
Hodgdon Hybrid 100V<<locked>>86%33,518 psi54%2762 fps95.5%
Hodgdon LEVERevolution<<locked>>80%42,598 psi68%3002 fps98.7%
Hodgdon Superformance<<locked>>94%51,750 psi83%3212 fps95.7%
Hodgdon TrailBoss<<locked>>80%26,426 psi42%1795 fps100%
Hodgdon VARGET<<locked>>80%44,454 psi71%2982 fps98.7%
IMR 3031<<locked>>80%46,108 psi74%3038 fps100%
IMR 4064<<locked>>80%41,017 psi66%2894 fps97.1%
IMR 4166 Enduron<<locked>>84%49,429 psi79%3038 fps95.5%
IMR 4350<<locked>>96%51,227 psi82%3114 fps95.4%
IMR 4451 Enduron<<locked>>90%49,429 psi79%3064 fps95.4%
IMR 4831<<locked>>88%37,695 psi60%2877 fps95.2%
IMR 4895<<locked>>80%42,641 psi68%2982 fps98%
IMR 8208 XBR<<locked>>80%47,993 psi77%3035 fps99.6%
Lovex D073.6<<locked>>80%45,295 psi73%3002 fps99.9%
Lovex S060<<locked>>80%45,788 psi73%2959 fps98.6%
Lovex S062<<locked>>80%40,988 psi66%2900 fps98.6%
Lovex S065<<locked>>88%43,250 psi69%2940 fps95.3%
Lovex S070<<locked>>92%46,847 psi75%3035 fps95.1%
Norma 201<<locked>>80%44,962 psi72%2976 fps99.3%
Norma 202<<locked>>80%45,469 psi73%2989 fps100%
Norma 203B<<locked>>80%41,017 psi66%2933 fps97.5%
Norma URP<<locked>>88%39,146 psi63%2927 fps95.5%
Ramshot Big Game<<locked>>80%40,756 psi65%2946 fps97.3%
Ramshot Hunter<<locked>>92%43,714 psi70%3035 fps95%
Ramshot TAC<<locked>>80%48,153 psi77%3038 fps96.9%
Ramshot Wild Boar<<locked>>80%47,732 psi77%3064 fps98.8%
Ramshot X-Terminator<<locked>>80%51,822 psi83%3091 fps99.3%
ReloadSwiss RS 14<<locked>>80%26,803 psi43%1841 fps100%
ReloadSwiss RS 50<<locked>>84%45,411 psi73%2989 fps95.1%
ReloadSwiss RS 52<<locked>>80%44,121 psi71%3064 fps97.7%
ReloadSwiss RS 60<<locked>>80%35,752 psi57%2904 fps98.7%
ReloadSwiss RS 62<<locked>>88%39,015 psi63%2946 fps95.2%
ReloadSwiss RS 70<<locked>>90%41,684 psi67%3022 fps95.3%
Rottweil R 901<<locked>>80%49,081 psi79%3031 fps100%
Rottweil R 902<<locked>>80%42,844 psi69%2923 fps98.9%
Rottweil R 903<<locked>>80%36,303 psi58%2818 fps96.9%
Rottweil R 907<<locked>>92%50,952 psi82%3091 fps95.2%
Shooters World Long Rifle<<locked>>88%43,250 psi69%2940 fps95.3%
Shooters World Match Rifle<<locked>>80%45,295 psi73%3002 fps99.9%
Shooters World Precision<<locked>>80%40,988 psi66%2900 fps98.6%
Shooters World SW4350<<locked>>92%46,847 psi75%3035 fps95.1%
SNPE Vectan SP 11<<locked>>80%37,333 psi60%2871 fps96.3%
SNPE Vectan SP 7<<locked>>80%46,412 psi74%3009 fps97%
SNPE Vectan SP 9<<locked>>80%44,599 psi72%2989 fps98.3%
SNPE Vectan Tubal 3000<<locked>>80%46,238 psi74%2930 fps100%
SNPE Vectan Tubal 5000<<locked>>80%38,551 psi62%2776 fps99.9%
SNPE Vectan Tubal 7000<<locked>>92%49,037 psi79%3005 fps95.4%
Somchem S321<<locked>>80%52,170 psi84%3123 fps99.9%
Somchem S335<<locked>>80%45,861 psi74%2927 fps100%
Somchem S341<<locked>>80%46,108 psi74%3005 fps98.5%
Somchem S355<<locked>>80%36,999 psi59%2822 fps96.8%
Somchem S365<<locked>>84%30,676 psi49%2743 fps95.8%
Vihtavuori N130<<locked>>80%52,069 psi83%3002 fps100%
Vihtavuori N133<<locked>>80%46,572 psi75%2927 fps100%
Vihtavuori N135<<locked>>80%42,351 psi68%2907 fps100%
Vihtavuori N140<<locked>>80%43,004 psi69%2913 fps100%
Vihtavuori N150<<locked>>80%35,288 psi57%2756 fps97.7%
Vihtavuori N160<<locked>>86%38,392 psi62%2874 fps95.1%
Vihtavuori N530<<locked>>80%48,283 psi77%3035 fps99.6%
Vihtavuori N540<<locked>>80%41,466 psi66%2897 fps99.8%
Vihtavuori N550<<locked>>88%40,495 psi65%2936 fps95.7%
Vihtavuori N555<<locked>>94%36,564 psi59%2910 fps95.5%
Winchester 6.5 StaBALL<<locked>>82%33,431 psi54%2723 fps95.7%
Winchester 748<<locked>>80%48,109 psi77%3084 fps99.9%
Winchester 760<<locked>>92%48,153 psi77%3120 fps95.3%
Winchester StaBALL HD<<locked>>98%34,171 psi55%2920 fps96.3%
Winchester StaBALL Match<<locked>>80%44,019 psi71%2989 fps98.7%

ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.

<<locked>> you need an access license to unlock this data.

This overview compares 111 powders for .300 H&H Mag. loaded with the .308 | 135gr | Sierra HPBT MatchKing. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,330 fps; across all powders the maximum-charge window runs from 2,008 fps to 3,330 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 (430 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 135.0 gr projectile in 0.308" calls for a 1:15.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-19 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 3100, ADI AR 2209, Alliant Reloder-19 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.

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