Rocketman has a point.

Journee, Lowry. Jones, have shown via repeatable experiments that patterns follow predicable distribution.

A writer in Gun Digest wrote an article "Heat and Beat It" re the effect of crude swaged choke compared to more sophisticated types. There was no difference.

Journee also found that training lessens pointing errors, and that presumably would improve scores. Again, confirmed by later experiments by Dr Jones.

It took about 100 years to verify that shooting technique is the vital bit.