Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 88gr | Inceptor SRR bullet and 80 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Alliant Reloder-16 and ReloadSwiss RS 70.
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: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 82% | 54,462 psi | 85% | 3842 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 56,927 psi | 89% | 3898 fps | 97.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,695 psi | 89% | 3917 fps | 98.7% |
| Accurate 4064 | <<locked>> | 84% | 55,201 psi | 87% | 3904 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 57,682 psi | 90% | 4009 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 86% | 55,840 psi | 88% | 3944 fps | 99.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 55,637 psi | 87% | 4081 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 56,710 psi | 89% | 3973 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,855 psi | 89% | 3999 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 92% | 54,505 psi | 85% | 4016 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 88% | 56,217 psi | 88% | 4049 fps | 100% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 56,652 psi | 89% | 4022 fps | 96.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,272 psi | 83% | 3947 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,093 psi | 72% | 3809 fps | 97.4% |
| Alliant Reloder-26 | <<locked>> | 96% | 54,027 psi | 85% | 4032 fps | 99.4% |
| Bofors RP3 | <<locked>> | 84% | 53,969 psi | 85% | 3917 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 56,652 psi | 89% | 4022 fps | 96.6% |
| Bofors RP7 | <<locked>> | 90% | 57,246 psi | 90% | 3953 fps | 97.4% |
| Hodgdon H380 | <<locked>> | 84% | 54,418 psi | 85% | 3927 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 90% | 56,202 psi | 88% | 3999 fps | 97.8% |
| Hodgdon H4350 | <<locked>> | 88% | 55,477 psi | 87% | 3953 fps | 96.3% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 55,027 psi | 86% | 3924 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 55,753 psi | 87% | 3990 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 57,667 psi | 90% | 4035 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,824 psi | 56% | 2717 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 56,115 psi | 88% | 3963 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 55,085 psi | 86% | 3927 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 82% | 54,186 psi | 85% | 3888 fps | 97.2% |
| IMR 4350 | <<locked>> | 92% | 55,230 psi | 87% | 3911 fps | 97.1% |
| IMR 4451 Enduron | <<locked>> | 88% | 55,361 psi | 87% | 3921 fps | 97.4% |
| IMR 4831 | <<locked>> | 92% | 54,302 psi | 85% | 3924 fps | 99.4% |
| IMR 4895 | <<locked>> | 82% | 54,534 psi | 85% | 3967 fps | 99.8% |
| Lovex S060 | <<locked>> | 82% | 56,376 psi | 88% | 3924 fps | 99.9% |
| Lovex S062 | <<locked>> | 84% | 55,230 psi | 87% | 3924 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 55,535 psi | 87% | 3914 fps | 98.6% |
| Lovex S070 | <<locked>> | 92% | 57,159 psi | 90% | 3960 fps | 98.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,282 psi | 73% | 3701 fps | 96.5% |
| Norma 201 | <<locked>> | 82% | 56,217 psi | 88% | 3944 fps | 100% |
| Norma 202 | <<locked>> | 82% | 57,130 psi | 90% | 3944 fps | 100% |
| Norma 203B | <<locked>> | 84% | 56,115 psi | 88% | 3980 fps | 99.9% |
| Norma 204 | <<locked>> | 92% | 56,594 psi | 89% | 3970 fps | 96.1% |
| Norma MRP | <<locked>> | 98% | 56,623 psi | 89% | 4055 fps | 97.9% |
| Norma URP | <<locked>> | 92% | 56,173 psi | 88% | 3990 fps | 99.4% |
| Ramshot Big Game | <<locked>> | 82% | 53,751 psi | 84% | 3924 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 92% | 55,593 psi | 87% | 3973 fps | 98.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,289 psi | 57% | 2772 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 54,476 psi | 85% | 3898 fps | 97.9% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 55,419 psi | 87% | 4049 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 54,143 psi | 85% | 3950 fps | 99.1% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 57,101 psi | 89% | 4065 fps | 99.5% |
| Rottweil R 902 | <<locked>> | 84% | 56,985 psi | 89% | 3944 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 54,128 psi | 85% | 3914 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 90% | 57,246 psi | 90% | 3953 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 55,535 psi | 87% | 3914 fps | 98.6% |
| Shooters World Precision | <<locked>> | 84% | 55,230 psi | 87% | 3924 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 57,159 psi | 90% | 3960 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 56,304 psi | 88% | 3980 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 56,710 psi | 89% | 3967 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,840 psi | 89% | 3875 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 54,897 psi | 86% | 3799 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 55,448 psi | 87% | 3848 fps | 97.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 57,508 psi | 90% | 4009 fps | 96.7% |
| Somchem S335 | <<locked>> | 82% | 56,768 psi | 89% | 3855 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 57,682 psi | 90% | 3976 fps | 100% |
| Somchem S365 | <<locked>> | 94% | 55,985 psi | 88% | 3996 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 54,708 psi | 86% | 3901 fps | 97% |
| Vihtavuori N133 | <<locked>> | 82% | 57,406 psi | 90% | 3855 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 57,246 psi | 90% | 3901 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 54,375 psi | 85% | 3852 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 55,651 psi | 87% | 3881 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 54,563 psi | 86% | 3914 fps | 99.2% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,563 psi | 86% | 3865 fps | 96.6% |
| Vihtavuori N540 | <<locked>> | 84% | 56,594 psi | 89% | 3894 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 53,882 psi | 84% | 3911 fps | 99.1% |
| Vihtavuori N555 | <<locked>> | 98% | 55,230 psi | 87% | 3980 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,085 psi | 86% | 3865 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 56,347 psi | 88% | 4003 fps | 97.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 49,516 psi | 78% | 3999 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 57,203 psi | 90% | 3973 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 55,376 psi | 87% | 3891 fps | 96.1% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 50,879 psi | 80% | 3780 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,327 psi | 77% | 3743 fps | 95.2% |
| Accurate 3100 | <<locked>> | 92% | 42,018 psi | 66% | 3596 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 48,153 psi | 75% | 3773 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 39,610 psi | 62% | 3602 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 45,861 psi | 72% | 3730 fps | 98.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 51,459 psi | 81% | 3993 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,311 psi | 73% | 3760 fps | 99.3% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,588 psi | 78% | 3852 fps | 99% |
| Alliant Reloder-16 | 92.6 gr | 82% | 38,392 psi | 60% | 3619 fps | 95.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,321 psi | 65% | 3714 fps | 98.3% |
| Alliant Reloder-22 | <<locked>> | 98% | 52,678 psi | 83% | 3937 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 88% | 34,519 psi | 54% | 3474 fps | 96% |
| Alliant Reloder-25 | <<locked>> | 96% | 40,030 psi | 63% | 3642 fps | 95% |
| Alliant Reloder-26 | 109.7 gr | 88% | 38,856 psi | 61% | 3652 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 46,731 psi | 73% | 3763 fps | 99.4% |
| Bofors RP5 | <<locked>> | 98% | 52,678 psi | 83% | 3937 fps | 95.5% |
| Bofors RP7 | <<locked>> | 86% | 50,140 psi | 79% | 3806 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 47,210 psi | 74% | 3770 fps | 97.6% |
| Hodgdon H414 | <<locked>> | 86% | 48,602 psi | 76% | 3832 fps | 95.9% |
| Hodgdon H4350 | <<locked>> | 86% | 51,692 psi | 81% | 3868 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,257 psi | 52% | 3399 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,866 psi | 81% | 3914 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 86% | 49,139 psi | 77% | 3852 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,585 psi | 42% | 2457 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,446 psi | 82% | 3888 fps | 99.8% |
| IMR 4064 | <<locked>> | 80% | 48,167 psi | 75% | 3783 fps | 98.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,720 psi | 79% | 3812 fps | 96.4% |
| IMR 4350 | <<locked>> | 88% | 48,269 psi | 76% | 3760 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 84% | 48,631 psi | 76% | 3776 fps | 95.8% |
| IMR 4831 | <<locked>> | 82% | 38,043 psi | 60% | 3537 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 50,908 psi | 80% | 3894 fps | 99.5% |
| Lovex S060 | <<locked>> | 80% | 52,910 psi | 83% | 3855 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 48,312 psi | 76% | 3780 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 42,511 psi | 67% | 3619 fps | 95.4% |
| Lovex S070 | <<locked>> | 86% | 46,789 psi | 73% | 3734 fps | 95.6% |
| Lovex S071 | <<locked>> | 98% | 43,105 psi | 68% | 3625 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 52,663 psi | 83% | 3875 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,519 psi | 84% | 3878 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,965 psi | 77% | 3835 fps | 99.2% |
| Norma 204 | <<locked>> | 90% | 52,620 psi | 82% | 3888 fps | 95% |
| Norma MRP | <<locked>> | 94% | 48,559 psi | 76% | 3878 fps | 95.9% |
| Norma URP | <<locked>> | 82% | 39,450 psi | 62% | 3599 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 49,864 psi | 78% | 3845 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 86% | 44,715 psi | 70% | 3734 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,948 psi | 42% | 2510 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,369 psi | 74% | 3743 fps | 96.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,976 psi | 69% | 3809 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 39,842 psi | 62% | 3612 fps | 95.6% |
| ReloadSwiss RS 70 | 103.8 gr | 84% | 42,061 psi | 66% | 3714 fps | 96.1% |
| Rottweil R 902 | <<locked>> | 80% | 50,024 psi | 78% | 3809 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 43,758 psi | 69% | 3684 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 86% | 50,140 psi | 79% | 3806 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 82% | 42,511 psi | 67% | 3619 fps | 95.4% |
| Shooters World Precision | <<locked>> | 80% | 48,312 psi | 76% | 3780 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 86% | 46,789 psi | 73% | 3734 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,397 psi | 71% | 3750 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,910 psi | 83% | 3891 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,200 psi | 83% | 3809 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,947 psi | 70% | 3612 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 44,962 psi | 70% | 3619 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 53,505 psi | 84% | 3924 fps | 95.7% |
| Somchem S335 | <<locked>> | 80% | 53,272 psi | 83% | 3796 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,106 psi | 69% | 3691 fps | 98.7% |
| Somchem S365 | <<locked>> | 80% | 33,069 psi | 52% | 3445 fps | 96.8% |
| Somchem S385 | <<locked>> | 92% | 47,601 psi | 75% | 3747 fps | 95% |
| Vihtavuori N133 | <<locked>> | 80% | 53,780 psi | 84% | 3793 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 50,024 psi | 78% | 3776 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,821 psi | 80% | 3783 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,206 psi | 66% | 3599 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 80% | 38,130 psi | 60% | 3527 fps | 95.1% |
| Vihtavuori N165 | <<locked>> | 98% | 50,807 psi | 80% | 3789 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 49,385 psi | 77% | 3760 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 40,669 psi | 64% | 3599 fps | 95.9% |
| Vihtavuori N555 | <<locked>> | 86% | 35,795 psi | 56% | 3507 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,869 psi | 59% | 3484 fps | 97.8% |
| Winchester 760 | <<locked>> | 86% | 48,747 psi | 76% | 3839 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 90% | 33,315 psi | 52% | 3524 fps | 96.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 53,185 psi | 83% | 3894 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 96% | 51,459 psi | 81% | 3816 fps | 95.1% |
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 100 powders for .30-378 Weath. Mag. loaded with the .308 | 88gr | Inceptor SRR. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 4,081 fps; across all powders the maximum-charge window runs from 2,717 fps to 4,081 fps. Accurate 3100 gives the best case fill at 100 %, and 100 of the 100 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 88.0 gr projectile in 0.308" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, Alliant Reloder-22 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. Alliant Reloder-26, Alliant Reloder-16, ReloadSwiss RS 70 rank at the top here: for .30-378 Weath. Mag. with the .308 | 88gr | Inceptor SRR they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, Baschieri & Pellagri 109, Hodgdon H1000 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.