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

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

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 Auto Magnum load data
Case Length (l3):	1.299" \| 33.0mm
Cartridge Length (C.O.L.):	1.277" \| 32.4mm
Seated Depth:	0.591" \| 15.0mm
Shank Seated Depth:	0.591" \| 15.0mm
Case Capacity:	35.0 Grains of Water \| 2.27 cm³
Primer Size:	Small Pistol Magnum (SPM)
Max. allowed Pressure:	36985 psi \| 2550 bar
LID:	LID_B10536_C511
Last updated:	2025-01-01

Load data for 104 loads in caliber .357 Auto Magnum with .358 | 120gr | Rim Rock TC Cowboy bullet and 52 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>>	92%	32372	88%	**52	97%
ADI AP 70N	<<locked>>	64%	32793	89%	**53	100%
ADI APS 350	<<locked>>	68%	32474	88%	**50	100%
ADI APS 450	<<locked>>	71%	32837	89%	**86	100%
ADI AS 30	<<locked>>	71%	32169	87%	**32	100%
ADI AS 50N	<<locked>>	69%	32924	89%	**88	100%
Accurate No. 2	<<locked>>	71%	32924	89%	**70	100%
[Accurate No. 7]*	<<locked>>	74%	33228	90%	**17	89%
Accurate Solo 1000	<<locked>>	70%	31357	85%	**48	100%
Accurate Solo 1250	<<locked>>	76%	32198	87%	**24	100%
[Accurate TCM]*	<<locked>>	82%	33228	90%	**04	84%
[Alliant BLUE DOT]*	<<locked>>	94%	32140	87%	**81	87%
Alliant BULLSEYE	<<locked>>	66%	31517	85%	**93	100%
Alliant POWER PISTOL	<<locked>>	76%	32314	87%	**91	96%
Alliant UNIQUE	<<locked>>	77%	32866	89%	**16	100%
Baschieri & Pellagri 100	<<locked>>	73%	32982	89%	**81	100%
Hodgdon Clays	<<locked>>	68%	33054	89%	**66	100%
Hodgdon HS-6	<<locked>>	63%	32430	88%	**32	99%
Hodgdon Universal	<<locked>>	69%	31676	86%	**34	100%
Hodgdon TrailBoss	<<locked>>	97%	15534	42%	**43	100%
[Lovex D037.1]*	<<locked>>	74%	33228	90%	**17	89%
[Lovex D037.2]*	<<locked>>	81%	33185	90%	**04	83%
Lovex S020	<<locked>>	69%	31850	86%	**53	100%
Maxam CSB 1	<<locked>>	78%	31401	85%	**07	100%
Maxam CSB 2	<<locked>>	74%	31227	84%	**14	100%
Maxam CSB 3	<<locked>>	73%	31415	85%	**85	100%
Maxam CSB 4	<<locked>>	70%	31241	84%	**58	100%
Maxam CSB 5	<<locked>>	68%	33040	89%	**32	100%
Ramshot Silhouette	<<locked>>	63%	32053	87%	**06	100%
ReloadSwiss RS 12	<<locked>>	66%	33257	90%	**17	100%
ReloadSwiss RS 14	<<locked>>	95%	13619	37%	**30	100%
ReloadSwiss RS 20	<<locked>>	76%	31169	84%	**86	100%
ReloadSwiss RS 24	<<locked>>	79%	33069	89%	**01	91%
Rottweil P 806	<<locked>>	85%	32924	89%	**27	100%
SNPE Vectan A0	<<locked>>	77%	31227	84%	**47	100%
SNPE Vectan BA 9	<<locked>>	70%	31459	85%	**17	100%
SNPE Vectan BA10	<<locked>>	64%	31647	86%	**76	100%
SNPE Vectan BA7 1/2	<<locked>>	83%	31923	86%	**06	99%
SNPE Vectan BA9 1/2	<<locked>>	71%	31633	86%	**30	100%
[Shooters World Heavy Pistol]*	<<locked>>	81%	33185	90%	**04	83%
[Shooters World Major Pistol]*	<<locked>>	74%	33228	90%	**17	89%
Somchem MP200	<<locked>>	71%	32793	89%	**03	100%
Somchem MS200	<<locked>>	74%	32576	88%	**70	100%
Somchem S221	<<locked>>	66%	32024	87%	**58	94%
Vihtavuori 3N37 👍	<<locked>>	78%	33243	90%	**58	100%
Vihtavuori 3N38	<<locked>>	89%	32256	87%	**75	92%
Vihtavuori N105	<<locked>>	95%	29892	81%	**04	95%
Vihtavuori N320	<<locked>>	70%	33011	89%	**88	100%
Vihtavuori N32C Tin Star	<<locked>>	94%	32256	87%	**02	100%
Vihtavuori N330	<<locked>>	71%	31720	86%	**40	100%
Vihtavuori N340	<<locked>>	73%	30879	84%	**57	100%
Vihtavuori N350 👍	<<locked>>	79%	31386	85%	**19	100%

Max Load - Barrel Length: 5.50''

Powder	Charge	FR	MaxP	%	V(0)	z
[ADI AP 100]*	<<locked>>	61%	13576	37%	**96	82%
ADI AP 70N	<<locked>>	61%	30603	83%	**21	100%
ADI APS 350	<<locked>>	61%	27412	74%	**75	100%
ADI APS 450	<<locked>>	61%	25991	70%	**88	100%
ADI AS 30	<<locked>>	62%	25208	68%	**20	100%
ADI AS 50N	<<locked>>	60%	26179	71%	**86	100%
Accurate No. 2	<<locked>>	61%	23772	64%	**19	100%
[Accurate No. 7]*	<<locked>>	63%	22002	59%	**81	81%
Accurate Solo 1000	<<locked>>	60%	24700	67%	**40	100%
Accurate Solo 1250	<<locked>>	62%	21727	59%	**47	100%
[Accurate TCM]*	<<locked>>	77%	28123	76%	**03	81%
[Alliant BLUE DOT]*	<<locked>>	81%	22785	62%	**91	80%
Alliant BULLSEYE	<<locked>>	61%	27209	74%	**11	100%
[Alliant POWER PISTOL]*	<<locked>>	61%	20407	55%	**35	89%
Alliant UNIQUE	<<locked>>	61%	21292	58%	**96	100%
Baschieri & Pellagri 100	<<locked>>	62%	24308	66%	**50	100%
Hodgdon Clays	<<locked>>	61%	27978	76%	**98	100%
Hodgdon HS-6	<<locked>>	61%	30472	82%	**09	99%
Hodgdon Universal	<<locked>>	61%	25338	69%	**32	100%
Hodgdon TrailBoss	<<locked>>	62%	7600	21%	**7	100%
[Lovex D037.1]*	<<locked>>	63%	22002	59%	**81	81%
[Lovex D037.2]*	<<locked>>	78%	29718	80%	**39	80%
Lovex S020	<<locked>>	61%	25309	68%	**52	100%
Maxam CSB 1	<<locked>>	61%	19870	54%	**04	100%
Maxam CSB 2	<<locked>>	61%	21132	57%	**47	100%
Maxam CSB 3	<<locked>>	61%	22931	62%	**43	100%
Maxam CSB 4	<<locked>>	61%	24569	66%	**57	100%
Maxam CSB 5	<<locked>>	62%	28065	76%	**60	100%
Ramshot Silhouette	<<locked>>	61%	30095	81%	**70	100%
ReloadSwiss RS 12	<<locked>>	61%	28558	77%	**52	100%
ReloadSwiss RS 14	<<locked>>	61%	6875	19%	**8	98%
ReloadSwiss RS 20	<<locked>>	61%	19740	53%	**76	100%
[ReloadSwiss RS 24]*	<<locked>>	63%	19000	51%	**86	80%
[Rottweil P 806]*	<<locked>>	61%	14054	38%	**94	88%
SNPE Vectan A0	<<locked>>	61%	20233	55%	**34	100%
SNPE Vectan BA 9	<<locked>>	60%	23743	64%	**89	100%
SNPE Vectan BA10	<<locked>>	61%	29225	79%	**43	100%
SNPE Vectan BA7 1/2	<<locked>>	61%	16621	45%	**78	92%
SNPE Vectan BA9 1/2	<<locked>>	61%	23598	64%	**89	100%
[Shooters World Heavy Pistol]*	<<locked>>	78%	29718	80%	**39	80%
[Shooters World Major Pistol]*	<<locked>>	63%	22002	59%	**81	81%
Somchem MP200	<<locked>>	61%	24903	67%	**68	100%
Somchem MS200	<<locked>>	62%	22727	61%	**02	100%
Somchem S221	<<locked>>	61%	26919	73%	**63	91%
Vihtavuori 3N37	<<locked>>	61%	19160	52%	**70	95%
[Vihtavuori 3N38]*	<<locked>>	71%	18217	49%	**70	81%
[Vihtavuori N105]*	<<locked>>	74%	15258	41%	**27	81%
Vihtavuori N320	<<locked>>	61%	25759	70%	**86	100%
Vihtavuori N32C Tin Star	<<locked>>	60%	14591	39%	**01	100%
Vihtavuori N330	<<locked>>	60%	23119	63%	**99	100%
Vihtavuori N340	<<locked>>	61%	21089	57%	**73	100%
Vihtavuori N350	<<locked>>	61%	17608	48%	**30	95%

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