Shooting My Long Bow Perpendicular and Then Canted

I shot arrows that were not spine marked. Then I shot new arrows that were spine marked at 500 and 600. These came from Lancaster Archery. I was testing arrow penetration on my new 32" Round Archery Target from Delta McKenzie. No arrows penetrated through to the back and the holes did self-heal. I think I shoot better when canting the bow.
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