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Yep !
Different bullets, different performances. Very few bullets of a given grain weight made by different compamies in a similar configuration act the same as you have just found out for yourself. The length of the load bearing surfaces can vary quite a bit and will create different pressures as will the gliding metal composition and the sheer thickness of the jackets used in the construction of the bullets. Within reasonable limits dont read too much into SD as a controlling factor for accuracy unless you are an extreme long range competition shooter.
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