IMR 4166 Load Data: 2,431 Published Loads in 48 Cartridges

Empirical Precision indexes 2,431 published loads for IMR 4166 across 48 bottleneck rifle cartridges from 8 reloading sources, spanning projectile weights from 35 gr to 300 gr.

Open IMR 4166 in the Load Library Open interactive Burn Chart

Published Loads2,431

Cartridges48

Sources8

Bullet Weights35–300 gr

Always start low and verify against the original published source before loading.

Powder Data Sheet

Manufacturer: IMR
Grain Type: Single-perforated Extruded
Bulk Density: 900 kg/m³

Burn Rate Position

Position #53 of 145 rifle powders on the Empirical Precision relative burn chart (ordered fastest to slowest).

Nearest Faster: Accurate 2495, Norma 201
Nearest Slower: Norma 202, Shooters World Tactical Rifle

A burn chart is a guide, not load data.

Cartridges Published (48)

Cartridge	Published Loads
30-06 Springfield	187
22 Nosler	155
308 Winchester	145
300 Remington SAUM	129
22 BR Remington	122
224 Valkyrie	121
22-250 Remington	118
6mm Creedmoor	112
223 Remington	104
6x47 Lapua	88
7mm-08 Remington	86
222 Remington Magnum	80
6mm Dasher	78
6mm BR	67
243 Winchester	65
6mm XC	62
250 Savage	61
260 Remington	61
223 Remington Ackley Improved	57
6.5x47mm Lapua	46
280 Remington	40
6.5 Creedmoor	39
22-250 Ackley Improved	37
6mm Remington	35
25-06 Remington	33
220 Swift	33
270 Winchester	33
338 Federal	26
24 Nosler	24
375 Ruger	19
6 GT	17
8x57mm IS (8mm Mauser)	16
300 WSM	14
338-06	14
6.8mm Remington SPC	12
300 Winchester Magnum	12
6mm ARC	11
7-30 Waters	10
270 WSM	10
308 Marlin Express	10
325 WSM	9
30-30 Winchester	8
7x57 Mauser	6
35 Whelen	6
223 WSSM	4
356 Winchester	4
6.5 Grendel	3
358 Winchester	2

Sources Publishing Data (8)

Publisher	Published Loads
Sierra	1,761
Hodgdon	460
Lyman	112
Hornady	39
Speer	32
Nosler	21
Barnes	4
Federal	2