Comments on: 6.8x45mm Kramer “Urban Combat Cartridge” http://www.thefirearmblog.com/blog/2008/06/22/68x45mm-kramer-urban-combat-cartridge/ Firearms not Politics Fri, 10 Feb 2012 22:19:07 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Pinto http://www.thefirearmblog.com/blog/2008/06/22/68x45mm-kramer-urban-combat-cartridge/comment-page-1/#comment-5148 Pinto Sun, 18 Jan 2009 16:48:24 +0000 http://www.thefirearmblog.com/blog/?p=2204#comment-5148 Good information about this 6.8 at 68forums.com---explains some of the advantages, disadvantages and how modern powders allow for increased velocities while working within the limits of materials and pressures. Good information about this 6.8 at 68forums.com—explains some of the advantages, disadvantages and how modern powders allow for increased velocities while working within the limits of materials and pressures.

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]]> By: cmblake6 http://www.thefirearmblog.com/blog/2008/06/22/68x45mm-kramer-urban-combat-cartridge/comment-page-1/#comment-2281 cmblake6 Thu, 26 Jun 2008 00:12:56 +0000 http://www.thefirearmblog.com/blog/?p=2204#comment-2281 Hmmm. I quite like that idea. And even LESS expensive to convert the current inventory to a more effective cartridge. Hmmm. I quite like that idea. And even LESS expensive to convert the current inventory to a more effective cartridge.

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]]> By: Daniel E. Watters http://www.thefirearmblog.com/blog/2008/06/22/68x45mm-kramer-urban-combat-cartridge/comment-page-1/#comment-2268 Daniel E. Watters Tue, 24 Jun 2008 16:43:34 +0000 http://www.thefirearmblog.com/blog/?p=2204#comment-2268 There is an old saying in racing circles: "There is no replacement for displacement." It applies to cartridge wildcatting as well. The only way you can get equal or near equal performance to a larger volume cartridge case from a smaller volume cartridge case is to raise pressure. Raising pressure has its limits. And just because a wildcat cartridge seems safe in its inventor's limited testing, that still doesn't make it acceptable for all situtations. For instance, while a cartridge might be within safe pressure limits at low or moderate temperatures, higher temperatures can raise pressures to unacceptable levels. There is an old saying in racing circles: “There is no replacement for displacement.” It applies to cartridge wildcatting as well.

The only way you can get equal or near equal performance to a larger volume cartridge case from a smaller volume cartridge case is to raise pressure. Raising pressure has its limits. And just because a wildcat cartridge seems safe in its inventor’s limited testing, that still doesn’t make it acceptable for all situtations. For instance, while a cartridge might be within safe pressure limits at low or moderate temperatures, higher temperatures can raise pressures to unacceptable levels.

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]]> By: Steve http://www.thefirearmblog.com/blog/2008/06/22/68x45mm-kramer-urban-combat-cartridge/comment-page-1/#comment-2263 Steve Tue, 24 Jun 2008 01:16:02 +0000 http://www.thefirearmblog.com/blog/?p=2204#comment-2263 I think the problem is that with most cartridges there is always a trade off. fast vs. slow, large caliber vs. small caliber, heavy vs. light, hollow point vs. solid vs. amour piercing. Then when you throw preconceived ideas into the mix it becomes very hard to choose a cartridge. If the "powers that be" were not convinced that any cartridge less than .30 in caliber was useless we would all be using a 7mm already. http://en.wikipedia.org/wiki/.280_British: "Ironically, in 2002 the Americans developed a new military calibre called the 6.8 mm Remington SPC which is ballistically very similar to the .280 British cartridge. Over 60 years after the .280 British cartridge was designed, the clock has now turned full circle." What needs to be developed it not a new cartridge but a specification of what is needed for the troops on the ground. This is were R&D needs to happen. Once a specification is developed, then developing or choosing a cartridge will be much less subjective. I think the problem is that with most cartridges there is always a trade off. fast vs. slow, large caliber vs. small caliber, heavy vs. light, hollow point vs. solid vs. amour piercing. Then when you throw preconceived ideas into the mix it becomes very hard to choose a cartridge.

If the “powers that be” were not convinced that any cartridge less than .30 in caliber was useless we would all be using a 7mm already. http://en.wikipedia.org/wiki/.280_British:

“Ironically, in 2002 the Americans developed a new military calibre called the 6.8 mm Remington SPC which is ballistically very similar to the .280 British cartridge. Over 60 years after the .280 British cartridge was designed, the clock has now turned full circle.”

What needs to be developed it not a new cartridge but a specification of what is needed for the troops on the ground. This is were R&D needs to happen. Once a specification is developed, then developing or choosing a cartridge will be much less subjective.

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]]> By: Daverino http://www.thefirearmblog.com/blog/2008/06/22/68x45mm-kramer-urban-combat-cartridge/comment-page-1/#comment-2262 Daverino Tue, 24 Jun 2008 00:56:36 +0000 http://www.thefirearmblog.com/blog/?p=2204#comment-2262 I think what we need to do is have a competition to see what the best battle cartridge is with today's technology. If we do it for planes ships and soldiers, something similar could surely be put together for such a vital part of our national defense. I do not think they would be interested, but perhaps Consumer Reports (the magazine) could do it, the hardest part would be coming up with the criteria. I think what we need to do is have a competition to see what the best battle cartridge is with today’s technology. If we do it for planes ships and soldiers, something similar could surely be put together for such a vital part of our national defense. I do not think they would be interested, but perhaps Consumer Reports (the magazine) could do it, the hardest part would be coming up with the criteria.

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