Talk:6×45mm

Merge

This article should be merged with the 6mm/223 - they're the same cartridge. AliveFreeHappy (talk) 01:10, 28 April 2009 (UTC)

no this article should not be merged as these are two completely different cartridges. 6mm/.223 is closer to the 6.8 spc —Preceding unsigned comment added by 75.166.11.253 (talk) 20:24, 12 July 2009 (UTC)

And yet someone merged them. Good idea IMHO. AliveFreeHappy (talk) 21:01, 27 August 2010 (UTC)

"The 6x45mm is a now considered obsolete..." Les Baer Custom and others produce AR-15 uppers for the cartridge.

"Since the cartridge was never commercially adopted by an ammunition manufacturer,..." Black Hills Ammunition and Cor-Bon both produce commercial 6x45 ammunition.Gingerspop (talk) 14:44, 21 May 2011 (UTC)

Ok I think we have a replacement -read and modify

Resolved

 – I replaced the content with the text below - just need to wikify and fix refs. AliveFreeHappy (talk) 19:28, 11 September 2010 (UTC)

The 6x45mm is a now considered obsolete, rimless, bottlenecked cartridge base on the .223 Remington or 5.56 NATO cartridge necked up to .243 (6mm). The cartridge is also known as the 6mm-233 Remington or 6mm/223.

History

Soon after the release of the .223 Remington as a commercial cartridge, shooters began experimenting with the cartridge in an attempt to improve its performance. Several of these experimenters necked up the .223 Remington to 6mm as the .24 caliber bullets provided better external ballistic performance over .22 caliber bullets. While several variation existed between early versions of these cartridges, the 6x45mm as we know it today became the standard version of the cartridge which is simply a necked up version of the .223 Remington without any further modifications or improvements made to it.

General Information

The cartridge’s inherent accuracy was a carry over from the .222 Remington which already had a loyal following in benchrest shooting circles. Benchrest shooters soon took notice of the cartridge and began building custom rifles chambered for the cartridge. As a testament to the 6x45mm’s accuracy, Jim Stekl, who at that time managed Remington’s custom shop and developer of the .22 BR cartridge, scored an aggregate record of .3069 inches in the 1973 IBS 200 yard Sporter category. However, its use in competitive shooting waned with the arrival of the 6mm BR and 6mm PPC cartridges on the benchrest shooting scene.

The advantage of the 6x45mm over the .223 Remington is that it is capable of being loaded heavier bullets with better ballistic coefficient ratings than its parent cartridge, the .223 Remington. This results in a flatter trajectory, less susceptible to wind drift and better energy retention characteristics.

The cartridge is extremely efficient with its small powder charge. This translated to excellent barrel life. The cartridge has a very low recoil and muzzle blast which make it a pleasant cartridge to shoot.

Since the cartridge was never commercially adopted by an ammunition manufacturer it has remained a wildcat cartridge since it inception. However, making cases from existing .223 Remington brass is simple as running the case through a 6x45mm die. The availability of .223 cases, the ease of forming, and the light power charge make for a very affordable shooting cartridge.

Performance

The advantage of the 6x45mm over the .223 Remington is that it is capable of being loaded heavier bullets with better ballistic coefficient ratings than its parent cartridge, the .223 Remington. This results in a flatter trajectory (with bullets of similar weight), less susceptibility to wind drift and better energy retention characteristics.

Cartridge	Criteria	Muzzle	50 yd (46 m)	100 yd (91 m)	150 yd (140 m)	200 yd (180 m)	300 yd (270 m)
.223 Remington 55 grains (3.6 g) Sierra FMJ-BT	Velocity	3,300 ft/s (1,000 m/s)	3,110 ft/s (950 m/s)	2,929 ft/s (893 m/s)	2,754 ft/s (839 m/s)	2,587 ft/s (789 m/s)	2,269 ft/s (692 m/s)
	Energy	1,330 ft⋅lbf (1,800 J)	1,181 ft⋅lbf (1,601 J)	1,047 ft⋅lbf (1,420 J)	926 ft⋅lbf (1,255 J)	817 ft⋅lbf (1,108 J)	629 ft⋅lbf (853 J)
6x45mm 90 grains (5.8 g) Sierra FMJ-BT	Velocity	2,700 ft/s (820 m/s)	2,580 ft/s (790 m/s)	2,462 ft/s (750 m/s)	2,348 ft/s (716 m/s)	2,237 ft/s (682 m/s)	2,023 ft/s (617 m/s)
	Energy	1,457 ft⋅lbf (1,975 J)	1,330 ft⋅lbf (1,800 J)	1,212 ft⋅lbf (1,643 J)	1,102 ft⋅lbf (1,494 J)	1,000 ft⋅lbf (1,400 J)	818 ft⋅lbf (1,109 J)

Hunting Applications

Many countries and U.S. states require a minimum of .24 caliber for hunting certain game species. In such countries and states the 6x45mm would be legal for hunting as long as no further requirement regarding power, energy, or case length is stipulated. However, it should be considered a marginal cartridge for these game species at best.

The cartridge gained a following in South Africa where it was used to hunt small antelope and gazelle species such as duiker, impala, klipspringer, springbok and the Thompson’s gazelles. In North America it is capable of taking small predator species such as bobcats, coyotes and foxes. In Europe, it can be used for small goat and deer species such as the roe dear and chamois where legally permitted.

An improved version of the cartridge called the 6mm TCU was developed for metallic silhouette shooting. While the cartridges are quite similar they are not interchangeable.

Platform Availability

The Armalite AR-15/M-16 can easily be converted to the 6x45mm with a simple barrel swap with little or no further modifications to the rifle. This is also true for rifles such as Ruger’s Mini 14 and most bolt action rifles chambered for the .223 Remington cartridge. The 6x45mm cartridge provides better down range performance than the .223 Remington or the 5.56 NATO cartridges. The cartridge had been offered by Cooper Arms, Kimber and a few other rifle manufacturers in their rifles as a regular factory chambering for a period of time.

However, the cartridge’s break through was in the area of handgun hunting where it became very popular. The Remington XP-100 and the T/C handgun were chambered for the cartridge. It provided a flat shooting cartridge capable of taking small deer and small game species.

References

Sierra Rifle & Handgun Reloading Data Ed. V

The Reloader Bench

Hornady #7

Hornady Ballistic Calculator

Shotgun news | A new company, an old concept: if you've been at it for more than 30 years, you may recall this mild and useful wildcat, popular in the 1970s. Now it's back: does it still offer anything?| by Fortier, David M.

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The article as written should avoid copyright conflicts but need to be cited correctly. DeusImperator (talk) 09:11, 11 September 2010 (UTC)

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