Load data for .44 Rem. Mag. + .429 | 300gr | Speer Magnum SP

Recommended Powder(s):

Load Specifications

(Use the Personalized Load Calculator below to adjust )

Bullet:	.429 \| 300gr \| Speer Magnum SP
Manufacturer SKU:	4463
Bullet Weight:	300gr \| 19.4g
Bullet Diameter:	0.429" \| 10.90mm
Bullet Length:	<<locked>>
Caliber:	.44 Rem. Mag. load data
Case Length (l3):	1.275" \| 32.4mm
Cartridge Length (C.O.L.):	<<locked>>
Seated Depth:	<<locked>>
Shank Seated Depth:	<<locked>>
Case Capacity:	39.5 Grains of Water \| 2.56 cm³
Primer Size:	Large Pistol Magnum (LPM)
Max. allowed Pressure:	40611 psi \| 2800 bar
LID:	LID_B6279_C714
Last updated:	2026-01-20

Load data for 94 loads in caliber .44 Rem. Mag. with .429 | 300gr | Speer Magnum SP bullet and 47 powder(s). 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>>	90%	35215	87%	**99	100%
ADI AP 70N	<<locked>>	63%	36201	89%	**7	100%
[Accurate 4100]*	<<locked>>	93%	35302	87%	**58	85%
Accurate No. 2	<<locked>>	69%	34969	86%	**10	100%
Accurate No. 7	<<locked>>	71%	36172	89%	**68	96%
Accurate No. 9	<<locked>>	80%	35897	88%	**58	91%
Accurate Solo 1250	<<locked>>	75%	35418	87%	**1	100%
Accurate TCM	<<locked>>	79%	35012	86%	**48	92%
[Alliant 2400]*	<<locked>>	91%	36506	90%	**88	89%
Alliant BLUE DOT	<<locked>>	92%	35447	87%	**48	95%
Alliant BULLSEYE	<<locked>>	66%	36013	89%	**40	100%
Alliant POWER PISTOL 👍	<<locked>>	75%	36463	90%	**45	100%
Alliant UNIQUE	<<locked>>	76%	36448	90%	**53	100%
Baschieri & Pellagri 100	<<locked>>	72%	36143	89%	**2	100%
Baschieri & Pellagri 102 Pistol	<<locked>>	89%	35215	87%	**8	100%
Baschieri & Pellagri 103 Pistol	<<locked>>	67%	34708	85%	**5	100%
[Hodgdon LilGun]*	<<locked>>	96%	27746	68%	**32	84%
Hodgdon Universal	<<locked>>	68%	34983	86%	**8	100%
Hodgdon CFE Pistol	<<locked>>	71%	34940	86%	**8	100%
Lovex D037.1	<<locked>>	71%	36172	89%	**68	96%
Lovex D037.2	<<locked>>	78%	35056	86%	**55	91%
Lovex S020	<<locked>>	68%	35592	88%	**07	100%
Maxam CSB 1	<<locked>>	78%	35708	88%	**1	100%
Maxam CSB 2	<<locked>>	75%	36187	89%	**4	100%
Maxam CSB 3	<<locked>>	72%	34272	84%	**8	100%
[Ramshot Enforcer]*	<<locked>>	90%	34664	85%	**75	89%
ReloadSwiss RS 12	<<locked>>	63%	34301	84%	**5	100%
ReloadSwiss RS 20	<<locked>>	75%	35070	86%	**33	100%
ReloadSwiss RS 24	<<locked>>	78%	36260	89%	**52	98%
Rottweil P 806	<<locked>>	81%	35592	88%	**52	100%
SNPE Vectan A0	<<locked>>	76%	34214	84%	**7	100%
SNPE Vectan BA 9	<<locked>>	71%	35578	88%	**4	100%
SNPE Vectan BA7 1/2	<<locked>>	81%	34476	85%	**56	100%
SNPE Vectan BA9 1/2	<<locked>>	72%	35897	88%	**1	100%
SNPE Vectan SP 2	<<locked>>	70%	35723	88%	**38	100%
Shooters World Heavy Pistol	<<locked>>	78%	35056	86%	**55	91%
Shooters World Major Pistol	<<locked>>	71%	36172	89%	**68	96%
Somchem MP200	<<locked>>	70%	36260	89%	**47	100%
Somchem MS200	<<locked>>	74%	35795	88%	**20	100%
Somchem S221 👍	<<locked>>	64%	35114	86%	**19	99%
Vihtavuori 3N37	<<locked>>	76%	36216	89%	**86	100%
Vihtavuori 3N38	<<locked>>	87%	35737	88%	**32	98%
Vihtavuori N105 👍	<<locked>>	93%	34563	85%	**58	100%
Vihtavuori N320	<<locked>>	69%	36303	89%	**1	100%
Vihtavuori N330	<<locked>>	69%	34374	85%	**1	100%
Vihtavuori N340	<<locked>>	74%	35650	88%	**20	100%
Vihtavuori N350	<<locked>>	80%	36463	90%	**83	100%

Max Load - Barrel Length: 5.50''

Powder	Charge	FR	MaxP	%	V(0)	z
ADI AP 100	<<locked>>	73%	22742	56%	**2	98%
ADI AP 70N	<<locked>>	61%	33837	83%	**8	100%
[Accurate 4100]*	<<locked>>	87%	28224	70%	**73	81%
Accurate No. 2	<<locked>>	61%	27398	67%	**8	100%
Accurate No. 7	<<locked>>	61%	24062	59%	**07	91%
[Accurate No. 9]*	<<locked>>	63%	19319	48%	**2	80%
Accurate Solo 1250	<<locked>>	69%	30530	75%	**8	100%
[Accurate TCM]*	<<locked>>	63%	19798	49%	**2	82%
[Alliant 2400]*	<<locked>>	75%	22263	55%	**8	80%
[Alliant BLUE DOT]*	<<locked>>	71%	20001	49%	**5	86%
Alliant BULLSEYE	<<locked>>	61%	31270	77%	**4	100%
Alliant POWER PISTOL	<<locked>>	61%	23206	57%	**1	97%
Alliant UNIQUE	<<locked>>	63%	25744	63%	**8	100%
Baschieri & Pellagri 100	<<locked>>	69%	33533	83%	**2	100%
Baschieri & Pellagri 102 Pistol	<<locked>>	86%	32982	81%	**2	100%
Baschieri & Pellagri 103 Pistol	<<locked>>	63%	30835	76%	**9	100%
[Hodgdon LilGun]*	<<locked>>	91%	23598	58%	**63	80%
Hodgdon Universal	<<locked>>	61%	28166	69%	**9	100%
Hodgdon CFE Pistol	<<locked>>	63%	28631	71%	**5	100%
Lovex D037.1	<<locked>>	61%	24062	59%	**07	91%
[Lovex D037.2]*	<<locked>>	63%	19943	49%	**2	81%
Lovex S020	<<locked>>	61%	28442	70%	**8	100%
Maxam CSB 1	<<locked>>	73%	31212	77%	**8	100%
Maxam CSB 2	<<locked>>	69%	31560	78%	**8	100%
Maxam CSB 3	<<locked>>	69%	31995	79%	**5	100%
[Ramshot Enforcer]*	<<locked>>	75%	20798	51%	**1	80%
ReloadSwiss RS 12	<<locked>>	61%	31908	79%	**2	100%
ReloadSwiss RS 20	<<locked>>	63%	24453	60%	**2	100%
ReloadSwiss RS 24	<<locked>>	61%	21190	52%	**5	91%
Rottweil P 806	<<locked>>	63%	18666	46%	**2	99%
SNPE Vectan A0	<<locked>>	69%	28094	69%	**5	100%
SNPE Vectan BA 9	<<locked>>	63%	29037	71%	**2	100%
SNPE Vectan BA7 1/2	<<locked>>	68%	23830	59%	**8	100%
SNPE Vectan BA9 1/2	<<locked>>	64%	29153	72%	**8	100%
SNPE Vectan SP 2	<<locked>>	61%	25817	64%	**24	99%
[Shooters World Heavy Pistol]*	<<locked>>	63%	19943	49%	**2	81%
Shooters World Major Pistol	<<locked>>	61%	24062	59%	**07	91%
Somchem MP200	<<locked>>	61%	27818	69%	**8	100%
Somchem MS200	<<locked>>	63%	27064	67%	**8	100%
Somchem S221	<<locked>>	61%	31328	77%	**76	98%
Vihtavuori 3N37	<<locked>>	61%	22756	56%	**2	100%
Vihtavuori 3N38	<<locked>>	69%	20479	50%	**2	91%
Vihtavuori N105	<<locked>>	72%	17550	43%	**9	93%
Vihtavuori N320	<<locked>>	66%	33576	83%	**8	100%
Vihtavuori N330	<<locked>>	64%	29501	73%	**5	100%
Vihtavuori N340	<<locked>>	64%	26672	66%	**8	100%
Vihtavuori N350	<<locked>>	64%	22582	56%	**5	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