Load data for .445 Super Mag. + .43 | 200gr | Rim Rock RNFP Cowboy

Recommended Powder(s): Alliant POWER PISTOL

Load Specifications

(Use the Personalized Load Calculator below to adjust )

Bullet:	.43 \| 200gr \| Rim Rock RNFP Cowboy
Manufacturer SKU:	#020
Bullet Weight:	200gr \| 13.0g
Bullet Diameter:	0.430" \| 10.92mm
Bullet Length:	<<locked>>
Caliber:	.445 Super Mag. load data
Case Length (l3):	1.600" \| 40.6mm
Cartridge Length (C.O.L.):	<<locked>>
Seated Depth:	<<locked>>
Shank Seated Depth:	<<locked>>
Case Capacity:	49.0 Grains of Water \| 3.18 cm³
Primer Size:	Large Pistol Magnum (LPM)
Max. allowed Pressure:	40611 psi \| 2800 bar
LID:	LID_B10614_C793
Last updated:	2026-04-28

Load data for 106 loads in caliber .445 Super Mag. with .43 | 200gr | Rim Rock RNFP Cowboy bullet and 53 powders such as Alliant POWER PISTOL. 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>>	82%	35897	88%	**12	100%
ADI APS 350	<<locked>>	66%	36042	89%	**37	100%
ADI APS 450	<<locked>>	67%	35897	88%	**63	100%
ADI AS 30	<<locked>>	66%	35404	87%	**96	100%
[Accurate 4100]*	<<locked>>	83%	35868	88%	**58	83%
Accurate No. 2	<<locked>>	64%	35868	88%	**24	100%
Accurate No. 7	<<locked>>	63%	36289	89%	**78	95%
Accurate No. 9	<<locked>>	71%	36535	90%	**81	90%
Accurate Solo 1000	<<locked>>	65%	35665	88%	**22	100%
Accurate Solo 1250	<<locked>>	69%	36361	90%	**88	100%
Accurate TCM	<<locked>>	71%	35984	89%	**65	91%
[Alliant 2400]*	<<locked>>	80%	35665	88%	**78	87%
Alliant BE-86	<<locked>>	67%	35549	88%	**62	100%
Alliant BLUE DOT	<<locked>>	82%	36390	90%	**72	94%
Alliant Herco	<<locked>>	80%	35346	87%	**37	100%
Alliant POWER PISTOL 👍	<<locked>>	66%	35259	87%	**45	99%
Alliant RED DOT	<<locked>>	68%	35766	88%	**16	100%
Alliant UNIQUE	<<locked>>	67%	35578	88%	**50	100%
Baschieri & Pellagri 100	<<locked>>	66%	36289	89%	**39	100%
Baschieri & Pellagri 102 Pistol	<<locked>>	82%	36100	89%	**32	100%
Hodgdon Clays	<<locked>>	65%	35418	87%	**40	100%
[Hodgdon LilGun]*	<<locked>>	91%	36027	89%	**47	87%
Hodgdon CFE Pistol	<<locked>>	66%	36521	90%	**98	100%
Hodgdon TrailBoss	<<locked>>	95%	20682	51%	**63	100%
Lovex D037.1	<<locked>>	63%	36289	89%	**78	95%
Lovex D037.2	<<locked>>	70%	36535	90%	**81	90%
Maxam CSB 1	<<locked>>	71%	35607	88%	**75	100%
Maxam CSB 2	<<locked>>	66%	35549	88%	**62	100%
Maxam CSB 3	<<locked>>	68%	36477	90%	**62	100%
Maxam CSB 4	<<locked>>	66%	36201	89%	**35	100%
Maxam CSB 5	<<locked>>	63%	36274	89%	**96	100%
[Ramshot Enforcer]*	<<locked>>	80%	36434	90%	**01	88%
ReloadSwiss RS 14	<<locked>>	95%	19232	47%	**70	100%
ReloadSwiss RS 20	<<locked>>	68%	35998	89%	**40	100%
ReloadSwiss RS 24	<<locked>>	69%	36506	90%	**68	97%
Rottweil P 806	<<locked>>	71%	35766	88%	**45	100%
SNPE Vectan A0	<<locked>>	72%	36376	90%	**27	100%
SNPE Vectan A1	<<locked>>	64%	36056	89%	**68	100%
SNPE Vectan BA 9	<<locked>>	64%	35462	87%	**85	100%
[SNPE Vectan BA6 1/2]*	<<locked>>	97%	25918	64%	**85	83%
SNPE Vectan BA7 1/2	<<locked>>	74%	35665	88%	**73	100%
SNPE Vectan BA9 1/2	<<locked>>	65%	35868	88%	**81	100%
Shooters World Heavy Pistol	<<locked>>	70%	36535	90%	**81	90%
Shooters World Major Pistol	<<locked>>	63%	36289	89%	**78	95%
Somchem MS200	<<locked>>	66%	35505	87%	**17	100%
Vihtavuori 3N37	<<locked>>	68%	36260	89%	**86	100%
Vihtavuori 3N38	<<locked>>	80%	35766	88%	**42	97%
Vihtavuori N105	<<locked>>	83%	36143	89%	**81	99%
[Vihtavuori N110]*	<<locked>>	97%	32866	81%	**42	85%
Vihtavuori N32C Tin Star	<<locked>>	94%	35839	88%	**63	100%
Vihtavuori N340	<<locked>>	66%	35563	88%	**21	100%
Vihtavuori N350	<<locked>>	73%	35853	88%	**86	100%
Winchester AutoComp	<<locked>>	69%	36114	89%	**01	100%

Max Load - Barrel Length: 5.50''

Powder	Charge	FR	MaxP	%	V(0)	z
ADI AP 100	<<locked>>	61%	20189	50%	**07	94%
ADI APS 350	<<locked>>	61%	32053	79%	**88	100%
ADI APS 450	<<locked>>	61%	30850	76%	**94	100%
ADI AS 30	<<locked>>	61%	31517	78%	**43	100%
[Accurate 4100]*	<<locked>>	79%	31009	76%	**86	80%
Accurate No. 2	<<locked>>	61%	33069	81%	**98	100%
Accurate No. 7	<<locked>>	61%	33272	82%	**26	94%
[Accurate No. 9]*	<<locked>>	61%	24947	61%	**48	82%
Accurate Solo 1000	<<locked>>	61%	31763	78%	**73	100%
Accurate Solo 1250	<<locked>>	61%	28834	71%	**83	100%
[Accurate TCM]*	<<locked>>	61%	25396	63%	**62	84%
[Alliant 2400]*	<<locked>>	71%	26832	66%	**98	80%
Alliant BE-86	<<locked>>	61%	29892	74%	**86	100%
[Alliant BLUE DOT]*	<<locked>>	61%	19116	47%	**07	82%
Alliant Herco	<<locked>>	61%	21930	54%	**07	100%
Alliant POWER PISTOL	<<locked>>	61%	29936	74%	**47	98%
Alliant RED DOT	<<locked>>	61%	30589	75%	**40	100%
Alliant UNIQUE	<<locked>>	61%	29718	73%	**62	100%
Baschieri & Pellagri 100	<<locked>>	61%	31154	77%	**63	100%
Baschieri & Pellagri 102 Pistol	<<locked>>	61%	21161	52%	**12	100%
Hodgdon Clays	<<locked>>	61%	32779	81%	**07	100%
[Hodgdon LilGun]*	<<locked>>	83%	27804	68%	**73	80%
Hodgdon CFE Pistol	<<locked>>	61%	32126	79%	**35	100%
Hodgdon TrailBoss	<<locked>>	61%	10443	26%	**3	100%
Lovex D037.1	<<locked>>	61%	33272	82%	**26	94%
[Lovex D037.2]*	<<locked>>	61%	25788	63%	**75	83%
Maxam CSB 1	<<locked>>	61%	27441	68%	**60	100%
Maxam CSB 2	<<locked>>	61%	30429	75%	**93	100%
Maxam CSB 3	<<locked>>	61%	30168	74%	**73	100%
Maxam CSB 4	<<locked>>	61%	32242	79%	**86	100%
Maxam CSB 5	<<locked>>	61%	34998	86%	**80	100%
[Ramshot Enforcer]*	<<locked>>	70%	24961	61%	**78	80%
ReloadSwiss RS 14	<<locked>>	61%	9993	25%	**7	100%
ReloadSwiss RS 20	<<locked>>	61%	28805	71%	**42	100%
ReloadSwiss RS 24	<<locked>>	61%	27514	68%	**98	92%
Rottweil P 806	<<locked>>	61%	24976	62%	**55	99%
SNPE Vectan A0	<<locked>>	61%	27514	68%	**96	100%
SNPE Vectan A1	<<locked>>	61%	32590	80%	**22	100%
SNPE Vectan BA 9	<<locked>>	61%	31952	79%	**35	100%
[SNPE Vectan BA6 1/2]*	<<locked>>	91%	22655	56%	**12	80%
SNPE Vectan BA7 1/2	<<locked>>	61%	24134	59%	**76	99%
SNPE Vectan BA9 1/2	<<locked>>	61%	32140	79%	**35	100%
[Shooters World Heavy Pistol]*	<<locked>>	61%	25788	63%	**75	83%
Shooters World Major Pistol	<<locked>>	61%	33272	82%	**26	94%
Somchem MS200	<<locked>>	61%	30893	76%	**55	100%
Vihtavuori 3N37	<<locked>>	61%	28616	70%	**71	100%
[Vihtavuori 3N38]*	<<locked>>	61%	19885	49%	**27	88%
[Vihtavuori N105]*	<<locked>>	61%	16868	42%	**84	88%
[Vihtavuori N110]*	<<locked>>	90%	26600	66%	**27	81%
Vihtavuori N32C Tin Star	<<locked>>	61%	18014	44%	**8	100%
Vihtavuori N340	<<locked>>	61%	30734	76%	**58	100%
Vihtavuori N350	<<locked>>	61%	25135	62%	**09	100%
Winchester AutoComp	<<locked>>	61%	28674	71%	**96	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