Hello Daryl,
hello Ripp,

thank you for your comments!

a)@ Daryl: yes, I have a Rem 870 shotgun with the shortest legal allowed barrel of 16", but I have no access to a shooting range which allows me to shoot pump-guns in a hurry like IPSC-style.
Training with semi-auto rifles: no problem
It would be a great gun to start with, but without enough training it is simply not for me.

@ Ripp: are you kidding?
on such occasions I take a handgun with me, of course!
But I do not think that I am a good enough shooter under stress, so I regard it as "back-up", not as my primary weapon.
And as I wrote, the animal might be running away, so I feel much better with a good handling and very short rifle to connect with a running boar at 20 or 30 or even 40 yards! (something I can forget with my handgun in a hurry)

Thank you!
Rolf