Annealing bullets is interesting, but more interesting is the knowledge base's analysis of the .300 mag vs 7mm mag debate. do you want it dead in 45 seconds or instantly?
"There is an old and long standing argument, which is better, the 7mm Remington Magnum or the .300 Winchester Magnum? This argument pits the two most common factory magnums head to head. In truth, each has its unique strengths. The strengths of the .300 are in its ability to produce fast killing on body weights greater than 90kg. To this end, the rule of this author states, where 90% of the hunters game weights are less than 90kg (200lb), the 7mm magnums show great strengths. If 90% of the hunters game weigh above 90kg, the .300 magnums produce excellent performance. More specifically, on tough game species weighing around 150-200kg (330-440lb), speed of killing can be reduced from 45 seconds (7mm Magnum with conventional bullets) to either instant collapse or a few second delay - at all ranges. Once this is seen in the field and fully understood, arguments about trajectories and wind drift quickly fall by the wayside."