Astable Multivibrator - Kalafuna is burning, not switching
R5 and R6 are your problem.

In the standard design for an astable multivibrator reference 1, reference 2 these resistors are not included.


  R5=R6 Are calculated for hfe=306 measured.


This is an indication of the problem. As Bimpelrekkie said in the comments, hfe shouldn't matter. In an astable multivibrator the transistors should be acting as pure switches. When they're on, we wish them to be all-the-way "on" i.e. driven into pure saturation, and when they're off we wish them to be all-the-way "off", i.e. driven into complete cutoff mode. For that reason, hfe should be ignored, because we should always design the circuit to wildly exceed the requirements for turn-on and turn-off given a particular hfe value.

If we simulate your circuit on circuitjs it shows the same behavior that you see in your physical circuit... except that it predicts that both R1 and R4 should be burning up.

If you delete R5 and R6 (or just set them to a tiny value like 0.1 ohms) then the circuit will begin oscillating... but in a pretty ugly fashion until you increase the values of R2 and R3 (1k worked for me). Tuning to the correct frequency is left as an exercise for the reader -- reference 1 above tells you exactly how to do it. Also make sure to get some higher-wattage resistors, as noted in the comments.