Load data for .45 Win. Mag. + .452 | 250gr | Rim Rock RNFP Cowboy

Recommended Powder(s): Alliant UNIQUE, ReloadSwiss RS 20, SNPE Vectan A0, Vihtavuori 3N37, Vihtavuori N350

Load Specifications

(Use the Personalized Load Calculator below to adjust )

Bullet:	.452 \| 250gr \| Rim Rock RNFP Cowboy
Manufacturer SKU:	#030
Bullet Weight:	250gr \| 16.2g
Bullet Diameter:	0.452" \| 11.48mm
Bullet Length:	0.655" \| 16.6mm
Caliber:	.45 Win. Mag. load data
Case Length (l3):	1.198" \| 30.4mm
Cartridge Length (C.O.L.):	1.312" \| 33.3mm
Seated Depth:	0.541" \| 13.7mm
Shank Seated Depth:	0.541" \| 13.7mm
Case Capacity:	38.0 Grains of Water \| 2.47 cm³
Primer Size:	Small Pistol Magnum (SPM)
Max. allowed Pressure:	39885 psi \| 2750 bar
LID:	LID_B10655_C740
Last updated:	2025-01-01

Load data for 118 loads in caliber .45 Win. Mag. with .452 | 250gr | Rim Rock RNFP Cowboy bullet and 59 powders such as Alliant UNIQUE, ReloadSwiss RS 20, SNPE Vectan A0, 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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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.
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%	25817	65%	**60	92%
ADI AP 70N	<<locked>>	76%	35375	89%	**09	100%
ADI APS 350	<<locked>>	78%	34432	86%	**8	100%
ADI APS 450	<<locked>>	82%	35389	89%	**8	100%
ADI AS 30	<<locked>>	85%	35027	88%	**07	100%
ADI AS 50N	<<locked>>	82%	35766	90%	**53	100%
Accurate No. 2	<<locked>>	80%	32721	82%	**83	100%
Accurate No. 5	<<locked>>	68%	33910	85%	**75	97%
[Accurate No. 7]*	<<locked>>	88%	35563	89%	**37	87%
Accurate Solo 1000	<<locked>>	84%	35795	90%	**37	100%
Accurate Solo 1250	<<locked>>	89%	33823	85%	**76	100%
Alliant BULLSEYE	<<locked>>	80%	35534	89%	**52	100%
Alliant POWER PISTOL	<<locked>>	90%	34229	86%	**24	95%
Alliant UNIQUE 👍	<<locked>>	90%	33837	85%	**45	100%
Baschieri & Pellagri 100	<<locked>>	85%	35070	88%	**37	100%
Hodgdon Clays	<<locked>>	78%	35114	88%	**5	100%
Hodgdon HP38	<<locked>>	63%	35085	88%	**70	100%
Hodgdon HS-6	<<locked>>	74%	33881	85%	**61	98%
Hodgdon Longshot	<<locked>>	71%	35041	88%	**68	99%
Hodgdon Universal	<<locked>>	84%	35375	89%	**09	100%
Hodgdon TrailBoss	<<locked>>	93%	10660	27%	**9	100%
Lovex D036	<<locked>>	68%	33852	85%	**75	97%
[Lovex D037.1]*	<<locked>>	88%	35563	89%	**37	87%
Lovex S011	<<locked>>	74%	35824	90%	**66	100%
Lovex S020	<<locked>>	82%	34650	87%	**12	100%
Maxam CSB 1	<<locked>>	93%	34214	86%	**76	100%
Maxam CSB 2	<<locked>>	92%	35592	89%	**02	100%
Maxam CSB 3	<<locked>>	87%	33968	85%	**53	100%
Maxam CSB 4	<<locked>>	83%	33591	84%	**30	100%
Maxam CSB 5	<<locked>>	77%	32822	82%	**1	100%
Ramshot Silhouette	<<locked>>	75%	35215	88%	**55	100%
Ramshot True Blue	<<locked>>	70%	34577	87%	**58	99%
Ramshot Zip	<<locked>>	63%	33823	85%	**66	100%
ReloadSwiss RS 12	<<locked>>	79%	34867	87%	**83	100%
ReloadSwiss RS 14	<<locked>>	97%	10225	26%	**5	100%
ReloadSwiss RS 20 👍	<<locked>>	95%	35868	90%	**61	100%
[ReloadSwiss RS 24]*	<<locked>>	94%	34925	88%	**14	89%
Rottweil P 801	<<locked>>	73%	34069	85%	**43	100%
Rottweil P 806	<<locked>>	97%	28935	73%	**04	98%
SNPE Vectan A0 👍	<<locked>>	94%	35578	89%	**12	100%
SNPE Vectan BA 9	<<locked>>	83%	33576	84%	**70	100%
SNPE Vectan BA10	<<locked>>	76%	35505	89%	**8	100%
SNPE Vectan BA7 1/2	<<locked>>	95%	31343	79%	**12	98%
SNPE Vectan BA9 1/2	<<locked>>	87%	35737	90%	**99	100%
Shooters World Auto Pistol	<<locked>>	68%	33852	85%	**75	97%
[Shooters World Major Pistol]*	<<locked>>	88%	35563	89%	**37	87%
Somchem MP200	<<locked>>	83%	34693	87%	**38	100%
Somchem MS200	<<locked>>	89%	35491	89%	**29	100%
Somchem S221	<<locked>>	79%	34606	87%	**94	93%
Vihtavuori 3N37 👍	<<locked>>	93%	35346	89%	**88	100%
[Vihtavuori 3N38]*	<<locked>>	97%	26542	67%	**99	86%
[Vihtavuori N105]*	<<locked>>	96%	19218	48%	**14	83%
Vihtavuori N310	<<locked>>	68%	35273	88%	**4	100%
Vihtavuori N320	<<locked>>	82%	34040	85%	**43	100%
Vihtavuori N32C Tin Star	<<locked>>	94%	24250	61%	**9	100%
Vihtavuori N330	<<locked>>	86%	35607	89%	**15	100%
Vihtavuori N340	<<locked>>	89%	35099	88%	**29	100%
Vihtavuori N350 👍	<<locked>>	96%	34795	87%	**71	100%
Winchester 231	<<locked>>	72%	35085	88%	**79	100%

Max Load - Barrel Length: 5.50''

Powder	Charge	FR	MaxP	%	V(0)	z
[ADI AP 100]*	<<locked>>	72%	13808	35%	**0	80%
ADI AP 70N	<<locked>>	61%	22989	58%	**8	100%
ADI APS 350	<<locked>>	61%	23018	58%	**7	100%
ADI APS 450	<<locked>>	62%	22147	56%	**0	100%
ADI AS 30	<<locked>>	60%	19421	49%	**0	100%
ADI AS 50N	<<locked>>	61%	20465	51%	**3	100%
Accurate No. 2	<<locked>>	61%	18086	45%	**3	96%
Accurate No. 5	<<locked>>	61%	27296	68%	**86	94%
[Accurate No. 7]*	<<locked>>	78%	24947	63%	**93	81%
Accurate Solo 1000	<<locked>>	62%	20494	51%	**6	100%
Accurate Solo 1250	<<locked>>	61%	15766	40%	**7	100%
Alliant BULLSEYE	<<locked>>	61%	21147	53%	**1	100%
[Alliant POWER PISTOL]*	<<locked>>	62%	14808	37%	**3	81%
Alliant UNIQUE	<<locked>>	61%	15795	40%	**3	97%
Baschieri & Pellagri 100	<<locked>>	61%	18115	45%	**3	100%
Hodgdon Clays	<<locked>>	61%	23235	58%	**3	100%
Hodgdon HP38	<<locked>>	61%	32285	81%	**43	100%
Hodgdon HS-6	<<locked>>	61%	21944	55%	**1	93%
Hodgdon Longshot	<<locked>>	61%	24497	61%	**33	97%
Hodgdon Universal	<<locked>>	62%	19116	48%	**6	100%
Hodgdon TrailBoss	<<locked>>	86%	9427	24%	**9	100%
Lovex D036	<<locked>>	61%	27267	68%	**86	94%
[Lovex D037.1]*	<<locked>>	78%	24947	63%	**93	81%
Lovex S011	<<locked>>	61%	25092	63%	**8	100%
Lovex S020	<<locked>>	61%	18188	46%	**2	100%
Maxam CSB 1	<<locked>>	61%	15200	38%	**0	100%
Maxam CSB 2	<<locked>>	62%	15214	38%	**0	100%
Maxam CSB 3	<<locked>>	61%	17622	44%	**0	100%
Maxam CSB 4	<<locked>>	61%	18971	48%	**0	100%
Maxam CSB 5	<<locked>>	61%	22118	55%	**3	100%
Ramshot Silhouette	<<locked>>	61%	22307	56%	**8	99%
Ramshot True Blue	<<locked>>	61%	25860	65%	**47	97%
Ramshot Zip	<<locked>>	61%	31082	78%	**40	100%
ReloadSwiss RS 12	<<locked>>	61%	20030	50%	**5	100%
ReloadSwiss RS 14	<<locked>>	91%	9195	23%	**3	100%
ReloadSwiss RS 20	<<locked>>	61%	13590	34%	**0	98%
[ReloadSwiss RS 24]*	<<locked>>	78%	21408	54%	**14	80%
Rottweil P 801	<<locked>>	61%	23917	60%	**5	100%
[Rottweil P 806]*	<<locked>>	68%	10443	26%	**0	81%
SNPE Vectan A0	<<locked>>	62%	15476	39%	**0	97%
SNPE Vectan BA 9	<<locked>>	62%	18826	47%	**3	100%
SNPE Vectan BA10	<<locked>>	61%	24555	62%	**6	100%
[SNPE Vectan BA7 1/2]*	<<locked>>	61%	12430	31%	**1	85%
SNPE Vectan BA9 1/2	<<locked>>	61%	17898	45%	**6	100%
Shooters World Auto Pistol	<<locked>>	61%	27267	68%	**86	94%
[Shooters World Major Pistol]*	<<locked>>	78%	24947	63%	**93	81%
Somchem MP200	<<locked>>	61%	18086	45%	**9	98%
Somchem MS200	<<locked>>	61%	16679	42%	**6	98%
[Somchem S221]*	<<locked>>	61%	18782	47%	**1	82%
[Vihtavuori 3N37]*	<<locked>>	61%	13445	34%	**3	88%
[Vihtavuori 3N38]*	<<locked>>	87%	19682	49%	**8	80%
[Vihtavuori N105]*	<<locked>>	93%	17941	45%	**8	82%
Vihtavuori N310	<<locked>>	61%	28674	72%	**2	100%
Vihtavuori N320	<<locked>>	60%	18579	47%	**6	100%
Vihtavuori N32C Tin Star	<<locked>>	60%	10631	27%	**2	100%
Vihtavuori N330	<<locked>>	61%	16578	42%	**9	100%
Vihtavuori N340	<<locked>>	61%	15824	40%	**0	97%
[Vihtavuori N350]*	<<locked>>	61%	12575	32%	**4	87%
Winchester 231	<<locked>>	61%	25179	63%	**1	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