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Load data for 458 x 2'' American + .459 | 300gr | Rim Rock TC Cowboy
Recommended Powder(s): IMR 4227, Lovex D060, Lovex D063, ReloadSwiss RS 36, Shooters World Buffalo Rifle
Load Specifications
(Use the Personalized Load Calculator below to adjust )
Bullet: | .459 | 300gr | Rim Rock TC Cowboy |
Manufacturer SKU: | #032 |
Bullet Weight: | 300gr | 19.4g |
Bullet Diameter: | 0.459" | 11.66mm |
Bullet Length: | 0.753" | 19.1mm |
Caliber: | 458 x 2'' American load data |
Case Length (l3): | 2.000" | 50.8mm |
Cartridge Length (C.O.L.): | <<locked>> |
Seated Depth: | <<locked>> |
Shank Seated Depth: | <<locked>> |
Case Capacity: | 73.0 Grains of Water | 4.74 cm³ |
Primer Size: | Large Rifle Magnum (LRM) |
Max. allowed Pressure: | 59988 psi | 4136 bar |
LID: | LID_B10679_C792 |
Last updated: | 2026-05-29 |
Load data for 52 loads in caliber 458 x 2'' American with .459 | 300gr | Rim Rock TC Cowboy bullet and 26 powders such as IMR 4227, Lovex D060, Lovex D063, ReloadSwiss RS 36, Shooters World Buffalo Rifle. The key underlying parameters are shown in the table above.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge unless there are reasons. Since xxlreloading.com has no control over the equipment and components used by the customer and the data used in connection with the website, any responsibility and liability for the results achieved is rejected. Also see our Terms of Service.
Questions regarding the load data: Please read the information in the next tab "Explanations".
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A load must fulfill certain criteria to be listed in the default view below - see "powder criteria to fulfill to be listed".
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Our load data might deviate from other sources - see the "most common reasons for deviations".
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All loads are based on the bullet and case dimensions shown under "Load Specifications" - see "reloading suggestions" if you deviate.
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You can set your specifications in the "Personalized Load Calculator".
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We recommend you limit powder range to relevant brands to speed up re-calculation of results
Use the Personalized Load Calculator to customize loads to your own specific requirements. Find more details in the help section.
Our default view only displays powders/loads that fulfill certain criteria: Max pressure of a load <=90% of Max. Standardized Pressure. Fill Rate (Min FR): >80% and <100% for rife loads, >60% and <100% for pistol loads. Min. Propellant Combustion (Min z): >90% for rifle loads , >80% for pistol/revolver loads. Relax these criteria at your own risk to potentially get more powders shown in the load tables.
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Click on the desired row in the tables below to add a specific load / powder to your Diary and manage there.
Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
ADI AR 2205 | 91% | 89% | 100% | |||
ADI AR 2207 | 96% | 64% | 100% | |||
Accurate 1680 | 97% | 81% | 98% | |||
Accurate 5744 | 85% | 89% | 99% | |||
Accurate No. 11 FS | 88% | 90% | 100% | |||
Alliant Reloder-10x | 97% | 53% | 94% | |||
Alliant Reloder-7 | 97% | 70% | 98% | |||
Baschieri & Pellagri 106 | 97% | 63% | 93% | |||
Hodgdon CFE BLK | 91% | 90% | 92% | |||
Hodgdon H4198 | 97% | 75% | 94% | |||
Hodgdon LilGun | 84% | 90% | 100% | |||
IMR 4198 | 97% | 60% | 96% | |||
IMR 4227 | 97% | 86% | 100% | |||
Lovex D060 | 91% | 89% | 99% | |||
Lovex D063 | 87% | 89% | 99% | |||
Lovex S040 | 84% | 89% | 100% | |||
Lovex S053 | 97% | 80% | 100% | |||
Norma 200 | 97% | 59% | 97% | |||
ReloadSwiss RS 36 | 97% | 83% | 100% | |||
SNPE Vectan BA6 1/2 | 97% | 74% | 100% | |||
SNPE Vectan SP 3 | 97% | 57% | 92% | |||
Shooters World Blackout | 87% | 89% | 99% | |||
Shooters World Buffalo Rifle | 91% | 89% | 99% | |||
Vihtavuori N110 | 94% | 89% | 100% | |||
Vihtavuori N120 | 96% | 65% | 100% | |||
Vihtavuori N130 | 97% | 52% | 93% |
Max Load - Barrel Length: 23.60''
Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
ADI AR 2205 | 81% | 65% | 100% | |||
ADI AR 2207 | 81% | 39% | 95% | |||
Accurate 1680 | 81% | 47% | 92% | |||
Accurate 5744 | 81% | 78% | 99% | |||
Accurate No. 11 FS | 81% | 71% | 100% | |||
Alliant Reloder-10x | 89% | 40% | 90% | |||
Alliant Reloder-7 | 81% | 42% | 92% | |||
Baschieri & Pellagri 106 | 91% | 53% | 90% | |||
Hodgdon CFE BLK | 88% | 81% | 90% | |||
Hodgdon H4198 | 88% | 57% | 90% | |||
Hodgdon LilGun | 81% | 82% | 100% | |||
IMR 4198 | 82% | 39% | 90% | |||
IMR 4227 | 81% | 53% | 97% | |||
Lovex D060 | 81% | 66% | 97% | |||
Lovex D063 | 81% | 72% | 98% | |||
Lovex S040 | 81% | 82% | 100% | |||
Lovex S053 | 81% | 50% | 99% | |||
Norma 200 | 83% | 36% | 90% | |||
ReloadSwiss RS 36 | 81% | 50% | 96% | |||
SNPE Vectan BA6 1/2 | 81% | 48% | 100% | |||
SNPE Vectan SP 3 | 94% | 52% | 90% | |||
Shooters World Blackout | 81% | 72% | 98% | |||
Shooters World Buffalo Rifle | 81% | 66% | 97% | |||
Vihtavuori N110 | 81% | 60% | 100% | |||
Vihtavuori N120 | 81% | 40% | 97% | |||
Vihtavuori N130 | 90% | 42% | 90% |
Start Load - Barrel Length: 23.60''
Any powder missing? Then click here.
FR ... fill rate of the cartridge in percent
MaxP ... max. pressure of load in psi or bar
% ... max. pressure of load in percent of the maximum allowed pressure for this caliber
V(0) ... muzzle velocity in feet per second (fps) or meters per second (m/s)
z ... powder burnt in percent
[...] *... not dangerous but load has suboptimal powder burnt with possible characteristics such as extensive muzzle flash or inaccurate loads.
[...] ²... fill rate low - you might want to consider using a filler to ensure proper ignition.
[...] ᴾ... possible press load - work up slowly to this load while watching for signs of excessive pressure.
👍 ... recommended powder/load for this caliber and bullet combination based on its ballistic performance.
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