strelyat' / vystrelit' clarification needed:)

hi all,

my dictionary says that in russian the verb "to shoot" is :
strelyat' / vystrelit' (or vystrel'nut')

why such a far-fetched perfective form ?

why not :
strelyat' / vystrelyat'
or
strelit' / vystrelit'

I see that almost all the time with russian verbs, the construction of the perfective form follows one of a few rules that seem to make sense. here we have two rules (addition of a prefix+ transformation of "ya" in "i") at the same time.
I really don't understand and even though I very well know that in every language, a few things have to be learned by heart and not understood, I'd still like to know if I missed something here.

thanks in advance for the possible explanation:)

It's called "double perfectivization".

ронять - уронить
кусать - укусить
сажать - посадить
вешать - повесить

Just memorise it. Most things in languages dont make sense and don't follow set rules.

Of course there should be some intuitive logic but it is not so straightforward. Get used to language and in the meantime you will feel it.