Load data for .357 Magnum + .358 | 125gr | Rim Rock TC Cowboy

Recommended Powder(s): Vihtavuori 3N37, Vihtavuori N350

Load Specifications

(Use the Personalized Load Calculator below to adjust )

Bullet:	.358 \| 125gr \| Rim Rock TC Cowboy
Manufacturer SKU:	#012
Bullet Weight:	125gr \| 8.1g
Bullet Diameter:	0.358" \| 9.09mm
Bullet Length:	0.541" \| 13.7mm
Caliber:	.357 Magnum load data
Case Length (l3):	1.290" \| 32.8mm
Cartridge Length (C.O.L.):	1.566" \| 39.8mm
Seated Depth:	0.265" \| 6.7mm
Shank Seated Depth:	0.265" \| 6.7mm
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_B10538_C513
Last updated:	2025-01-01

Load data for 112 loads in caliber .357 Magnum with .358 | 125gr | Rim Rock TC Cowboy bullet and 56 powders such as Vihtavuori 3N37, Vihtavuori N350. 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>>	96%	36434	84%	**32	98%
ADI AP 70N	<<locked>>	69%	38348	88%	**44	100%
ADI AS 30	<<locked>>	79%	38392	88%	**35	100%
ADI AS 50N	<<locked>>	73%	36825	85%	**58	100%
Accurate No. 2	<<locked>>	75%	37840	87%	**63	100%
Accurate No. 7	<<locked>>	77%	38595	89%	**17	92%
[Accurate No. 9]*	<<locked>>	86%	39088	90%	**04	86%
Accurate Solo 1000	<<locked>>	77%	37782	87%	**55	100%
Accurate Solo 1250	<<locked>>	82%	37840	87%	**17	100%
[Accurate TCM]*	<<locked>>	85%	37637	86%	**78	86%
[Alliant BLUE DOT]*	<<locked>>	96%	34563	79%	**35	88%
Alliant BULLSEYE	<<locked>>	72%	38464	88%	**03	100%
Alliant POWER PISTOL	<<locked>>	82%	38624	89%	**11	98%
Alliant UNIQUE	<<locked>>	83%	38566	89%	**16	100%
Baschieri & Pellagri 100	<<locked>>	79%	38812	89%	**75	100%
Hodgdon Clays	<<locked>>	72%	36303	83%	**43	100%
Hodgdon HS-6	<<locked>>	66%	37434	86%	**26	100%
Hodgdon Longshot	<<locked>>	64%	38783	89%	**32	100%
Hodgdon Universal	<<locked>>	75%	37072	85%	**24	100%
Hodgdon TrailBoss	<<locked>>	92%	14446	33%	**5	100%
Lovex D037.1	<<locked>>	77%	38595	89%	**17	92%
[Lovex D037.2]*	<<locked>>	84%	37855	87%	**85	85%
Lovex S011	<<locked>>	67%	37956	87%	**88	100%
Lovex S020	<<locked>>	74%	37869	87%	**60	100%
Maxam CSB 1	<<locked>>	85%	38174	88%	**17	100%
Maxam CSB 2	<<locked>>	82%	38203	88%	**17	100%
Maxam CSB 3	<<locked>>	80%	37942	87%	**91	100%
Maxam CSB 4	<<locked>>	77%	37623	86%	**68	100%
Maxam CSB 5	<<locked>>	73%	38290	88%	**19	100%
Ramshot Silhouette	<<locked>>	67%	37898	87%	**03	100%
Ramshot True Blue	<<locked>>	63%	38116	88%	**19	100%
ReloadSwiss RS 12	<<locked>>	72%	38899	89%	**14	100%
ReloadSwiss RS 14	<<locked>>	93%	13329	31%	**5	100%
ReloadSwiss RS 20	<<locked>>	82%	37043	85%	**86	100%
ReloadSwiss RS 24	<<locked>>	83%	37681	87%	**81	93%
Rottweil P 801	<<locked>>	66%	37492	86%	**62	100%
Rottweil P 806	<<locked>>	88%	37449	86%	**01	100%
SNPE Vectan A0	<<locked>>	86%	39059	90%	**70	100%
SNPE Vectan BA 9	<<locked>>	77%	37985	87%	**24	100%
SNPE Vectan BA10	<<locked>>	73%	39059	90%	**93	100%
SNPE Vectan BA7 1/2	<<locked>>	89%	37811	87%	**09	100%
SNPE Vectan BA9 1/2	<<locked>>	77%	36985	85%	**21	100%
[Shooters World Heavy Pistol]*	<<locked>>	84%	37855	87%	**85	85%
Shooters World Major Pistol	<<locked>>	77%	38595	89%	**17	92%
Somchem MP200	<<locked>>	76%	38682	89%	**03	100%
Somchem MS200	<<locked>>	80%	38058	87%	**67	100%
Somchem S221	<<locked>>	70%	37173	85%	**58	96%
Vihtavuori 3N37 👍	<<locked>>	82%	37101	85%	**29	100%
Vihtavuori 3N38	<<locked>>	94%	36999	85%	**62	94%
Vihtavuori N105	<<locked>>	95%	30472	70%	**19	95%
Vihtavuori N320	<<locked>>	76%	38928	89%	**81	100%
Vihtavuori N32C Tin Star	<<locked>>	96%	33779	78%	**43	100%
Vihtavuori N330	<<locked>>	75%	36361	84%	**21	100%
Vihtavuori N340	<<locked>>	80%	38159	88%	**70	100%
Vihtavuori N350 👍	<<locked>>	85%	37492	86%	**32	100%
Winchester 231	<<locked>>	66%	38899	89%	**17	100%

Max Load - Barrel Length: 5.50''

Powder	Charge	FR	MaxP	%	V(0)	z
[ADI AP 100]*	<<locked>>	60%	13750	32%	**43	82%
ADI AP 70N	<<locked>>	61%	30835	71%	**39	100%
ADI AS 30	<<locked>>	62%	25556	59%	**58	100%
ADI AS 50N	<<locked>>	61%	26760	62%	**27	100%
Accurate No. 2	<<locked>>	62%	24758	57%	**63	100%
[Accurate No. 7]*	<<locked>>	63%	22205	51%	**09	81%
[Accurate No. 9]*	<<locked>>	79%	30937	71%	**80	81%
Accurate Solo 1000	<<locked>>	61%	25266	58%	**81	100%
Accurate Solo 1250	<<locked>>	61%	21379	49%	**75	100%
[Accurate TCM]*	<<locked>>	76%	27963	64%	**14	81%
[Alliant BLUE DOT]*	<<locked>>	81%	22814	52%	**16	80%
Alliant BULLSEYE	<<locked>>	62%	28355	65%	**58	100%
[Alliant POWER PISTOL]*	<<locked>>	61%	20958	48%	**76	89%
Alliant UNIQUE	<<locked>>	61%	21190	49%	**27	100%
Baschieri & Pellagri 100	<<locked>>	61%	23902	55%	**75	100%
Hodgdon Clays	<<locked>>	61%	28079	65%	**32	100%
Hodgdon HS-6	<<locked>>	61%	30908	71%	**30	99%
Hodgdon Longshot	<<locked>>	61%	34214	79%	**76	100%
Hodgdon Universal	<<locked>>	61%	25338	58%	**57	100%
Hodgdon TrailBoss	<<locked>>	61%	7426	17%	**1	100%
[Lovex D037.1]*	<<locked>>	63%	22205	51%	**09	81%
[Lovex D037.2]*	<<locked>>	78%	29921	69%	**60	81%
Lovex S011	<<locked>>	61%	32561	75%	**25	100%
Lovex S020	<<locked>>	61%	25396	58%	**83	100%
Maxam CSB 1	<<locked>>	61%	20494	47%	**55	100%
Maxam CSB 2	<<locked>>	61%	21857	50%	**88	100%
Maxam CSB 3	<<locked>>	62%	23583	54%	**88	100%
Maxam CSB 4	<<locked>>	61%	25135	58%	**98	100%
Maxam CSB 5	<<locked>>	60%	27470	63%	**81	100%
Ramshot Silhouette	<<locked>>	61%	31053	71%	**04	100%
Ramshot True Blue	<<locked>>	61%	35766	82%	**99	100%
ReloadSwiss RS 12	<<locked>>	61%	28819	66%	**80	100%
ReloadSwiss RS 14	<<locked>>	62%	7121	16%	**5	98%
ReloadSwiss RS 20	<<locked>>	61%	19740	45%	**07	100%
[ReloadSwiss RS 24]*	<<locked>>	61%	18478	42%	**07	80%
Rottweil P 801	<<locked>>	61%	32198	74%	**99	100%
[Rottweil P 806]*	<<locked>>	61%	14330	33%	**35	88%
SNPE Vectan A0	<<locked>>	61%	20175	46%	**65	100%
SNPE Vectan BA 9	<<locked>>	61%	24743	57%	**37	100%
SNPE Vectan BA10	<<locked>>	60%	28674	66%	**61	100%
SNPE Vectan BA7 1/2	<<locked>>	60%	16810	39%	**15	92%
SNPE Vectan BA9 1/2	<<locked>>	60%	23525	54%	**17	100%
[Shooters World Heavy Pistol]*	<<locked>>	78%	29921	69%	**60	81%
[Shooters World Major Pistol]*	<<locked>>	63%	22205	51%	**09	81%
Somchem MP200	<<locked>>	61%	25251	58%	**96	100%
Somchem MS200	<<locked>>	61%	22713	52%	**30	100%
Somchem S221	<<locked>>	61%	27601	63%	**98	92%
Vihtavuori 3N37	<<locked>>	61%	19595	45%	**07	96%
[Vihtavuori 3N38]*	<<locked>>	70%	17796	41%	**84	80%
[Vihtavuori N105]*	<<locked>>	73%	14953	34%	**55	81%
Vihtavuori N320	<<locked>>	60%	25367	58%	**04	100%
Vihtavuori N32C Tin Star	<<locked>>	60%	14794	34%	**1	100%
Vihtavuori N330	<<locked>>	61%	24105	55%	**43	100%
Vihtavuori N340	<<locked>>	62%	22002	51%	**20	100%
Vihtavuori N350	<<locked>>	61%	17840	41%	**65	95%
Winchester 231	<<locked>>	61%	33678	77%	**55	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