We need more information on your setup. What bow are you shooting, and what point weight are tou shooting? Modern compounds can bullet hole with vastly underspined and overspined arrows (doesn’t mean that it’s ideal; i can shoot a bare 400 spine through paper with ease), the information about left and right tears being indicative an arrow spine reaction is becoming increasingly less reliable. Most folks will tell you tail left means this and tail right means that but very few can tell you “why” other than that’s what they read on Brand XYZs tune chart. A clean paper tear with a bare shaft tells you more about YOU than it does your arrow. I’m going to make some assumptions and say you could get your 300 to tune just fine, assuming its a moderately efficient bow, and you’re shooting a 100gr head with a standard insert system. Even if you’re arrow proved to be a bit “weak” on a spine software, how do you really know that it is? Insert length and head length also play a large role in all of this. If it tuned last year than it’ll tune this year.
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