Originally Posted by M1AShooter
I've had a Chrony Gamma for about 10 years, and it would always record the MV on the display, but only send to the printer about 8 or 9 out of every 10 shots. It recently started giving me similar error messages - completely out of the blue. Chrony said to clean the sensors (which I already had). It's dead and I'm looking for another brand. :-O
I traced mine down to a broken wire (the flat ribbon wire on the inside that connects the 2 sensors... I took care never to pinch it when I closed the unit - but it still gets crammed in there if you leave the phone line cable inside...
Shooting Chrony needs to beef up this wire significantly if they want to compete with the other brands.... I love the folding, portable concept, but it really needs to be beefed up to withstand normal use.
As for the talking about "nodes".. for people who don't know what this means: When a bullet is fired down a barrel, it spins with an insane amount of speed and force, cause the barrel to actually "whip", image a sine wave (up and down like waves on an ocean) - then image this is in 3D, going up and down while also rotating in a circle.
Some barrels/twist rates will shoot wonderful groups when they are thrown at a "sweet spot" in velocity.. and groups suffer if you go over or under that sweet spot - this is the node concept.
The barrel "whipping" is why everyone wants a thicker, stiffer barrel - but engineers realized quick that YOU SIMPLY CANNOT eliminate the flex/whip - the key to accuracy is finding an accurate node/speed window that causes the barrel to flex/whip EXACTLY the same way, every time. You will also find that if you stick in the velocity sweet spot, nearly all bullets will shoot well.
And of course, you'll never identify that sweet spot without an accurate chronograph.