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The following charts were calculated using M855 62 grain 5.56-mm ammunition. The chart comparing the 20” barreled M16A2 rifle velocity was fired with M193 55 grain ammunition. These energy comparison charts were calculated using the following data in our Oehler ballistics program.

These energy comparison charts were calculated using the following data in our Oehler ballistics program:

Elevation: 2000 feet 10.5” barrel velocity, 1-7 twist: 2600
Temperature: 75 degrees 14.5” barrel velocity, 1-7 twist: 2850
Humidity: 15% 16.0” barrel velocity, 1-7 twist: 2900
Barometric pressure: 29.85

Kramer Defense “DEMO” Program

U.S. Military units interested in evaluating the 6.8 x 45mm Urban Combat Cartridge may request a complete upper receiver group through our “Demo Upper” program. These complete upper receiver groups (URG’s) are available is several different configurations and barrel lengths, subject to component availability, ammunition is not provided.

Contact us at demo@kramerdefense.com for further information. Please provide a contact name, title, unit, organization or department and phone number.


Kramer 6.8 x 45mm vs 5.56mm HK 416
Range In Yards Muzzle 100 200 300 400 500 600
6.8 x 45 UCC Energy Advantage 45% 47% 50% 53% 58% 63% 70%
Kramer Carbine 10.5" (6.8 x 45mm UCC) 1351 1115 912 741 600 487 400
HK 416 10.5" (5.56mm NATO M855) 931 755 606 482 379 298 235


Kramer 6.8 x 45mm vs 5.56mm M27
Range In Yards Muzzle 100 200 300 400 500 600
6.8 x 45 UCC Energy Advantage 37% 40% 42% 44% 47% 51% 57%
Kramer Carbine 16" (6.8 x 45mm UCC) 1596 1326 1093 894 726 588 477
USMC M27 IAR 16" (5.56mm NATO M855) 1158 948 770 619 492 388 304


Kramer 6.8 x 45mm vs 5.56mm M4
Range In Yards Muzzle 100 200 300 400 500 600
6.8 x 45 UCC Energy Advantage 42% 45% 47% 50% 54% 58% 63%
Kramer Carbine 16" (6.8 x 45mm UCC) 1596 1326 1093 894 726 588 477
M4 Carbine 14.5" (5.56mm NATO M855) 1119 915 741 594 472 371 292


Kramer 6.8 x 45mm vs 7.62 x 39mm AK-47
Range In Yards Muzzle 100 200 300 400 500 600
6.8 x 45 UCC Energy Advantage 10% 19% 30% 43% 54% 60% 58%
Kramer Carbine 16" (6.8 x 45mm UCC) 1596 1326 1093 894 726 588 477
AK-47 16" (7.62mm x 39mm) 1445 1107 835 625 471 366 302


M16 Rifle 20" vs M4 14.5"
Range In Yards Muzzle 100 200 300 400 500
M16 Energy Advantage 11% 9% 7% 5% 2% 0%
M16 Rifle 20"" (5.56mm NATO M193) 1251 1003 797 626 485 371
M4 Carbine 14.5" (5.56mm NATO M855) 1119 915 741 594 472 371