Load data for .357 Magnum + .358 | 120gr | Rim Rock TC Cowboy

Recommended Powder(s): Alliant UNIQUE, Hodgdon Longshot, ReloadSwiss RS 20, Vihtavuori 3N37, Vihtavuori N340

Load Specifications

(Use the Personalized Load Calculator below to adjust )

Bullet:	.358 \| 120gr \| Rim Rock TC Cowboy
Manufacturer SKU:	#010
Bullet Weight:	120gr \| 7.8g
Bullet Diameter:	0.358" \| 9.09mm
Bullet Length:	0.569" \| 14.5mm
Caliber:	.357 Magnum load data
Case Length (l3):	1.290" \| 32.8mm
Cartridge Length (C.O.L.):	1.359" \| 34.5mm
Seated Depth:	0.500" \| 12.7mm
Shank Seated Depth:	0.500" \| 12.7mm
Case Capacity:	25.6 Grains of Water \| 1.66 cm³
Primer Size:	Small Pistol Magnum (SPM)
Max. allowed Pressure:	43511 psi \| 3000 bar
LID:	LID_B10536_C513
Last updated:	2025-01-01

Load data for 116 loads in caliber .357 Magnum with .358 | 120gr | Rim Rock TC Cowboy bullet and 58 powders such as Alliant UNIQUE, Hodgdon Longshot, ReloadSwiss RS 20, Vihtavuori 3N37, Vihtavuori N340. 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".
A load must fulfill certain criteria to be listed in the default view below - see "powder criteria to fulfill to be listed".

Our load data might deviate from other sources - see the "most common reasons for deviations".

All loads are based on the bullet and case dimensions shown under "Load Specifications" - see "reloading suggestions" if you deviate.

You can set your specifications in the "Personalized Load Calculator".

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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.
Case Length (Inch)
Case Length (mm)
CaseCapacity (GoW)
Min z (%)
Min FR (%)
Max FR*
Barrel Length (Inch)
Barrel Length (cm)
Safety Buffer (%)
.

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 AP 100]*	<<locked>>	94%	24787	57%	**60	89%
ADI AP 70N	<<locked>>	78%	37971	87%	**88	100%
ADI APS 350	<<locked>>	81%	37144	85%	**75	100%
ADI APS 450	<<locked>>	82%	35955	83%	**98	100%
ADI AS 30	<<locked>>	85%	35795	82%	**50	100%
ADI AS 50N	<<locked>>	82%	36274	83%	**02	100%
Accurate No. 2	<<locked>>	84%	37652	87%	**81	100%
Accurate No. 5	<<locked>>	69%	36347	84%	**50	96%
[Accurate No. 7]*	<<locked>>	88%	36753	84%	**03	85%
Accurate Solo 1000	<<locked>>	84%	35984	83%	**80	100%
Accurate Solo 1250	<<locked>>	91%	36245	83%	**45	100%
Alliant BULLSEYE	<<locked>>	80%	36245	83%	**17	100%
Alliant POWER PISTOL	<<locked>>	93%	37826	87%	**22	95%
Alliant UNIQUE 👍	<<locked>>	93%	36332	84%	**30	100%
Baschieri & Pellagri 100	<<locked>>	87%	36869	85%	**89	100%
Hodgdon Clays	<<locked>>	81%	37507	86%	**91	100%
Hodgdon HP38	<<locked>>	64%	35781	82%	**22	100%
Hodgdon HS-6	<<locked>>	75%	35998	83%	**34	98%
Hodgdon Longshot 👍	<<locked>>	74%	38305	88%	**60	99%
Hodgdon Universal	<<locked>>	85%	36158	83%	**68	100%
Hodgdon TrailBoss	<<locked>>	92%	10718	25%	**0	100%
Lovex D036	<<locked>>	69%	36289	83%	**50	96%
[Lovex D037.1]*	<<locked>>	88%	36753	84%	**03	85%
Lovex S011	<<locked>>	73%	35418	81%	**96	100%
Lovex S020	<<locked>>	84%	37217	86%	**85	100%
Maxam CSB 1	<<locked>>	96%	37304	86%	**48	100%
Maxam CSB 2	<<locked>>	92%	35679	82%	**48	100%
Maxam CSB 3	<<locked>>	92%	38972	90%	**45	100%
Maxam CSB 4	<<locked>>	85%	35853	82%	**93	100%
Maxam CSB 5	<<locked>>	81%	37057	85%	**50	100%
Ramshot Silhouette	<<locked>>	76%	36898	85%	**27	100%
Ramshot True Blue	<<locked>>	71%	37478	86%	**47	99%
Ramshot Zip	<<locked>>	65%	36085	83%	**29	100%
ReloadSwiss RS 12	<<locked>>	79%	35679	82%	**35	100%
ReloadSwiss RS 14	<<locked>>	91%	9239	21%	**7	99%
ReloadSwiss RS 20 👍	<<locked>>	97%	38580	89%	**47	100%
[ReloadSwiss RS 24]*	<<locked>>	95%	37623	86%	**96	88%
Rottweil P 801	<<locked>>	76%	37550	86%	**16	100%
Rottweil P 806	<<locked>>	95%	27963	64%	**30	96%
SNPE Vectan A0	<<locked>>	93%	35288	81%	**58	100%
SNPE Vectan BA 9	<<locked>>	88%	39015	90%	**75	100%
SNPE Vectan BA10	<<locked>>	79%	37971	87%	**17	100%
SNPE Vectan BA7 1/2	<<locked>>	94%	31053	71%	**42	97%
SNPE Vectan BA9 1/2	<<locked>>	88%	37666	87%	**65	100%
Shooters World Auto Pistol	<<locked>>	69%	36289	83%	**50	96%
[Shooters World Major Pistol]*	<<locked>>	88%	36753	84%	**03	85%
Somchem MP200	<<locked>>	86%	38029	87%	**30	100%
Somchem MS200	<<locked>>	89%	36216	83%	**88	100%
Somchem S221	<<locked>>	81%	38000	87%	**90	92%
Vihtavuori 3N37 👍	<<locked>>	94%	37304	86%	**57	99%
[Vihtavuori 3N38]*	<<locked>>	95%	26107	60%	**09	83%
Vihtavuori N310	<<locked>>	69%	36695	84%	**11	100%
Vihtavuori N320	<<locked>>	84%	36767	84%	**06	100%
Vihtavuori N32C Tin Star	<<locked>>	96%	25831	59%	**09	100%
Vihtavuori N330	<<locked>>	85%	35636	82%	**58	100%
Vihtavuori N340 👍	<<locked>>	92%	38305	88%	**14	100%
Vihtavuori N350	<<locked>>	96%	35897	82%	**34	99%
Winchester 231	<<locked>>	72%	36085	83%	**29	100%

Max Load - Barrel Length: 5.50''

Powder	Charge	FR	MaxP	%	V(0)	z
[ADI AP 100]*	<<locked>>	79%	16969	39%	**83	82%
ADI AP 70N	<<locked>>	60%	22568	52%	**68	100%
ADI APS 350	<<locked>>	60%	22365	51%	**8	100%
ADI APS 450	<<locked>>	62%	22582	52%	**24	100%
ADI AS 30	<<locked>>	60%	19493	45%	**20	100%
ADI AS 50N	<<locked>>	60%	20392	47%	**73	100%
Accurate No. 2	<<locked>>	61%	18101	42%	**70	95%
Accurate No. 5	<<locked>>	62%	27934	64%	**19	93%
[Accurate No. 7]*	<<locked>>	81%	28152	65%	**71	81%
Accurate Solo 1000	<<locked>>	61%	20088	46%	**53	100%
Accurate Solo 1250	<<locked>>	61%	15853	36%	**20	99%
Alliant BULLSEYE	<<locked>>	61%	20972	48%	**61	99%
[Alliant POWER PISTOL]*	<<locked>>	67%	17782	41%	**42	82%
Alliant UNIQUE	<<locked>>	60%	15374	35%	**43	95%
Baschieri & Pellagri 100	<<locked>>	61%	18173	42%	**30	100%
Hodgdon Clays	<<locked>>	60%	22553	52%	**04	100%
Hodgdon HP38	<<locked>>	60%	32416	75%	**80	100%
Hodgdon HS-6	<<locked>>	62%	23032	53%	**17	92%
Hodgdon Longshot	<<locked>>	61%	24453	56%	**47	95%
Hodgdon Universal	<<locked>>	61%	18753	43%	**99	100%
Hodgdon TrailBoss	<<locked>>	69%	6701	15%	**9	99%
Lovex D036	<<locked>>	62%	27891	64%	**25	93%
[Lovex D037.1]*	<<locked>>	81%	28152	65%	**71	81%
Lovex S011	<<locked>>	61%	25222	58%	**65	100%
Lovex S020	<<locked>>	62%	18681	43%	**09	99%
Maxam CSB 1	<<locked>>	61%	15287	35%	**01	99%
Maxam CSB 2	<<locked>>	62%	15679	36%	**43	100%
Maxam CSB 3	<<locked>>	61%	17477	40%	**37	100%
Maxam CSB 4	<<locked>>	62%	19783	45%	**63	100%
Maxam CSB 5	<<locked>>	62%	22771	52%	**70	100%
Ramshot Silhouette	<<locked>>	61%	22829	52%	**11	98%
Ramshot True Blue	<<locked>>	61%	26310	60%	**76	96%
Ramshot Zip	<<locked>>	62%	32750	75%	**93	100%
ReloadSwiss RS 12	<<locked>>	60%	20102	46%	**19	100%
ReloadSwiss RS 14	<<locked>>	68%	5976	14%	**6	93%
ReloadSwiss RS 20	<<locked>>	62%	14446	33%	**37	97%
[ReloadSwiss RS 24]*	<<locked>>	81%	24395	56%	**80	81%
Rottweil P 801	<<locked>>	61%	24526	56%	**52	100%
[Rottweil P 806]*	<<locked>>	71%	12285	28%	**56	81%
SNPE Vectan A0	<<locked>>	61%	15127	35%	**7	95%
SNPE Vectan BA 9	<<locked>>	62%	19131	44%	**79	100%
SNPE Vectan BA10	<<locked>>	60%	23960	55%	**47	100%
[SNPE Vectan BA7 1/2]*	<<locked>>	62%	12894	30%	**5	83%
SNPE Vectan BA9 1/2	<<locked>>	60%	17724	41%	**63	100%
Shooters World Auto Pistol	<<locked>>	62%	27891	64%	**25	93%
[Shooters World Major Pistol]*	<<locked>>	81%	28152	65%	**71	81%
Somchem MP200	<<locked>>	62%	18869	43%	**15	97%
Somchem MS200	<<locked>>	62%	17361	40%	**66	98%
[Somchem S221]*	<<locked>>	61%	19276	44%	**55	80%
[Vihtavuori 3N37]*	<<locked>>	60%	13561	31%	**04	86%
[Vihtavuori 3N38]*	<<locked>>	92%	23728	55%	**70	81%
Vihtavuori N310	<<locked>>	60%	28384	65%	**22	100%
Vihtavuori N320	<<locked>>	62%	19856	46%	**79	100%
Vihtavuori N32C Tin Star	<<locked>>	60%	10631	24%	**3	100%
Vihtavuori N330	<<locked>>	62%	17347	40%	**86	100%
Vihtavuori N340	<<locked>>	61%	15621	36%	**33	96%
[Vihtavuori N350]*	<<locked>>	61%	12401	28%	**1	84%
Winchester 231	<<locked>>	62%	26542	61%	**04	100%

Start Load - Barrel Length: 5.50''

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.

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