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Trailboss is a high volume capasity,fast burning, intended for reduced loads for the large cases like .308, 30-30, 45-70, ect. It was made to replace the powder that was used for the cowboy shoots, cartridges. It works good in my 308 bolt gun. In the 300W you can only get 7grs in the case and does not have enough energy to cycle the action of AR15. It could be used for single shot. I did not chrono, but I think it is slow. It is safe because you cannot double charge. My 762x39 will hold 9grs and will not cycle with it using the same bullets.
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