While it may seem amazing that such a difference can occur with 15 grains of difference in the bullet, another way to look at the problem is to think of the rifle as a highly precise machine tool in regard to systems theory. With such a high level of precision, a change in any one facet will affect the end result. A change in powder or powder burn rate will also create changes.
Look at it this way, if you didn't have a precision instrument, you might not notice the effect on your shooting.
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"If you look through your scope and see your shoe, aim higher." -- said to me by my 11 year old daughter before going out for hogs 8/13/2011
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