You'll find some people take factors like loading close to the rifling that matter in long range rifle and apply it to loading short range pistol because they "feel" it should make the pistol load somehow better also. It doesn't, and it can cause reliability problems with normal component variations, not to mention when you buy that new pistol and it chokes on your longer reloads because it has no freebore in the rifling. There is no industry standard for freebore, and STI competitiion pistols have a lot while some compact 9mms have none.

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Science plus Art