The 105 gr Cavity Back Bullet MKZ
Length: 1.246
G1 coefficient: 0.480
Price: $34.50/50 ($0.69 ea)
Source: Cavity Back Bullet Web Site
![[Image: attachment.php?attachmentid=8508]](http://www.65grendel.com/forum/attachment.php?attachmentid=8508)
Another newcomer to the LFP scene, CBB has produced a very exciting line, called MKZ, that promises to be very effective at Grendel velocities. The unique design of these LFPs is explained on their website that includes three grooves cut into the upper half to aid expansion, and a cavity in the base to allow more room for powder. The benefits of this design are described on the CBB website: http://www.cavitybackbullets.com/category-s/103.htm
The unique feature is the cavity in the base. The cavity is 0.160" deep and holds about 0.8 gr CFE 223.
Left: 1724 fps, no expansion, penetration was >25" as it took a curved path.
Right: 2088 fps, expanded to 0.435", penetration >17" (hit bottom of second gel)
![[Image: attachment.php?attachmentid=8510]](http://www.65grendel.com/forum/attachment.php?attachmentid=8510)
As CavityBackBullets pointed out in post #9 on the related thread, the 105s are made to a higher hardness than the 118s. http://www.65grendel.com/forum/showt...gr-gel-results
This data supports the higher hardness. The 105 did not open at all at 1724 fps. The tip was damaged when it struck the bottom metal plate.
![[Image: attachment.php?attachmentid=8385]](http://www.65grendel.com/forum/attachment.php?attachmentid=8385)
The gel shows the 1724 fps shot at the top, leaving very little of a cavity until it flipped over after 13". The second track was at 2113; third was 2247, forth was 2088; and the 5th was a commercial SST traveling at 2511 fps. You can see the red tip in the second node of the track. Only the two shown were recovered. All others exited the top of the second get.
Here are links to DoubleNaughtSpy's videos on performance of the 105:
260 lb Boar and Coyote
210 lb Boar
Link to his review post: http://www.65grendel.com/forum/showthrea...hic-Images
Length: 1.246
G1 coefficient: 0.480
Price: $34.50/50 ($0.69 ea)
Source: Cavity Back Bullet Web Site
Another newcomer to the LFP scene, CBB has produced a very exciting line, called MKZ, that promises to be very effective at Grendel velocities. The unique design of these LFPs is explained on their website that includes three grooves cut into the upper half to aid expansion, and a cavity in the base to allow more room for powder. The benefits of this design are described on the CBB website: http://www.cavitybackbullets.com/category-s/103.htm
The unique feature is the cavity in the base. The cavity is 0.160" deep and holds about 0.8 gr CFE 223.
Left: 1724 fps, no expansion, penetration was >25" as it took a curved path.
Right: 2088 fps, expanded to 0.435", penetration >17" (hit bottom of second gel)
As CavityBackBullets pointed out in post #9 on the related thread, the 105s are made to a higher hardness than the 118s. http://www.65grendel.com/forum/showt...gr-gel-results
This data supports the higher hardness. The 105 did not open at all at 1724 fps. The tip was damaged when it struck the bottom metal plate.
The gel shows the 1724 fps shot at the top, leaving very little of a cavity until it flipped over after 13". The second track was at 2113; third was 2247, forth was 2088; and the 5th was a commercial SST traveling at 2511 fps. You can see the red tip in the second node of the track. Only the two shown were recovered. All others exited the top of the second get.
Here are links to DoubleNaughtSpy's videos on performance of the 105:
260 lb Boar and Coyote
210 lb Boar
Link to his review post: http://www.65grendel.com/forum/showthrea...hic-Images