I traditionally used 2213 in the 270, had no issues, always went bang flop. Then about 18 months ago played around with Superformance just to see what could be achieved. In the following loads it shot about 200fps faster than 2213 and was accurate.
59gn, 130 SGK, 3159fps
57gn, 140 SGK, 3005fps
58gn, 140 Interlokt, 3062fps - very accurate and hits like the hammer of Thor!
Knowing the temperature stability issues, I tend to ensure that I use these loads in the colder months, or keep the cartridges away from the heat and sun. But it is an excellent choice for many 270's.
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