6 x 45 mm Load Data & Reloading Guide

Rifle

Also known as: 6x45mm, 6mm x 45

About 6 x 45 mm

The 6 x 45 mm caliber, also known as the .243 Super X in some circles, is a wildcat cartridge that originated from the popular .223 Remington casing, necked up to accept a 6 mm bullet. This caliber was developed in response to the growing demand for small to medium game hunting and competition shooting, providing an alternative to larger calibers for those looking for versatility and performance in a lightweight package.

Technically, the 6 x 45 mm offers impressive ballistic characteristics for its size. With a case length of 45 mm, it accommodates a variety of bullet weights typically ranging from 55 to 90 grains. This flexibility allows shooters to tailor their loads to specific needs, optimizing for velocity and energy retention. The cartridge is known for its moderate recoil and efficient powder use, making it a favorable choice for precision shooting and regular practice without excessive fatigue or expense.

In terms of performance, the 6 x 45 mm is recognized for its flat trajectory and effective range out to about 300 yards, which makes it suitable for varmint hunting and target shooting. It offers sufficient stopping power for small to medium-sized game while maintaining accuracy. The caliber's ability to handle various bullet designs also enhances its versatility, adapting well to different shooting sports and environments.

For reloaders, the 6 x 45 mm presents several advantages. Its foundation on the ubiquitous .223 Remington case makes sourcing brass relatively straightforward. Moreover, the reloading process is uncomplicated, allowing experimentation with bullet types and weights to fine-tune performance according to specific goals. This level of customization appeals to precision shooters and enthusiasts who seek to optimize each cartridge load for different scenarios, offering a customized shooting experience without deviating significantly from standard reloading practices.

Technical Drawing

6 x 45 mm technical drawing and load data

Technical Specifications

Maximum Pressure:55114 PSI / 3800 bar
Case Volume:30.5 Grains of Water
Primer Size:Large Rifle (LR)
Safety Standard:Wildcat
Bore Area:29.25 mm²
Barrel Diameter:0.243" / 6.2 mm
L3:1.76" / 44.7 mm
L6:2.26" / 57.4 mm

Start Calculating to Develop your own Load Data for 6 x 45 mm

Use our professional ballistics calculator to develop safe and accurate load recipes for 6 x 45 mm.

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Brass Case Capacities

The following table shows the case capacity (Grains of Water) for brass in cartridge 6 x 45 mm where we have data (number of datapoints in brackets).

Lapua (1)30.3

Standard Load Data — 6 x 45 mm

Select your desired cartridge and bullet weight below to access the corresponding load table. From there, you can choose any listed load recipe and transfer it directly into the ballistics calculator for further refinement, optimization, and precision tuning.

All
64 gr
65 gr
70 gr
75 gr
77 gr
85 gr
90 gr
95 gr
96 gr
100 gr
105 gr

Community Loads — 6 x 45 mm

Here are some popular loads for 6 x 45 mm:

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BulletPowderBarrel (in)Charge (gr)Case Volume (GoW)OAL (in)Max. Pressure (psi)Muzzle Velocity (fps)
.243 | 70gr | Sierra MatchKing (70gr)
Vihtav
N133
26.022.030.52.2634,065 (62%)2677
M.243 | 75gr | Sierra VarmintKing (75gr)
ADI
AR 2207
24.0••.•30.52.2653,345 (97%)2933
M.243 | 75gr | Sierra VarmintKing (75gr)
ADI
AR 2207
24.0••.•28.82.2449,908 (91%)2848
.243 | 75gr | Sierra VarmintKing (75gr)
ADI
AR 2207
24.0••.•30.52.2646,195 (84%)2831
.243 | 75gr | Sierra VarmintKing (75gr)
ADI
AR 2207
24.0••.•28.82.2446,499 (84%)2795
.243 | 75gr | Sierra VarmintKing (75gr)
ADI
AR 2207
24.0••.•28.82.3044,280 (80%)2772
.243 | 75gr | Sierra VarmintKing (75gr)
ADI
AR 2207
24.0••.•30.52.2638,290 (69%)2684
.243 | 75gr | Sierra VarmintKing (75gr)
ADI
AR 2207
24.019.030.52.2635,389 (64%)2628
.243 | 75gr | Sierra VarmintKing (75gr)
ADI
AR 2207
24.019.228.82.4044,788 (81%)2736
M.243 | 87gr | Hornady V-MAX (87gr)
Vihtav
N133
26.0••.•30.82.3654,244 (98%)2710

Frequently Asked Questions

The maximum pressure for 6 x 45 mm is 55,114 psi | 3,800 bar.

6 x 45 mm typically uses a Large Rifle (LR) primer.

The case capacity of 6 x 45 mm is approximately 30.5 grains of water (H₂O).