PaulS wrote: |
2506 responds well to slower powders to drive a bullet hard but there are other powders that can generat good performance at reduced velocity. Having said that I would go with H414 and a 90 grain bullet which will take the cartridge to it's velocity limits. That means that I would sacrifice barrel for the velocity as long as accuracy was good. If I wanted to keep the barrel for a lifetime of shooting I would choose the 120 grain bullet using H870 or H450. The H870 is best suited to the case and bullet but H450 will get you close to 3000 fps and keep the pressures and velocity down a bit. You will notice that I recommend double based powders. That is because they are capable of holding pressures high over a longer period that continues to accelerate the bullet the full length of the bore. Most people wrongly assume that the higher average pressure comes at the cost of higher heat bur double base powders produce lower heat of a longer time to get the velocities that are so high. Using a magnum primer with these powders burns all of the powder during the pressure peak (in the first few inches of barrel) and allows the pressure to continue to hold that pressure better. It is easier on the barrel as long as velocities are kept reasonable. There are not sharp edges on the burning powder kernels and that slows erosion. Heat and abrasive wear are the hardest on the life of a barrel. Hard burning kernels scraping the lead and the rifling does more harm than the spherical grains of double base powders. |
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