I'd better carry "Zabardast", my Jeffery in .450 NE in case that Blaster doesn't measure up.

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I do think owning one of these kit rifles, a .22RF is a good idea. One becomes so much more familiar if one actually shoots ones rifles, a lot. If the magazines aren't too finicky to reload, one could shoot hundreds of rounds at targets, tin cans, bunnies, birds. When one then screws in the .300. 8mm, .416, 404 or wgatever, everything is pretty much familiar. Especially if a similar scope, yes the scope might be different, the weight and balance a bit different.

I use my .222 a lot in my Mauser M03, far more than the three other barrels. The M03 has a set trigger, push it forward and it is very crisp and light. Great care to squeeze it but aids accuracy immensely. I use it on the .222 or the .404. Obviously with the .404 not when offhand only when shooting from a very good rest and carefully.

Using the .222 a lot, makes the rifle very familar.

A great failing of having too many guns is one never really becomes to be like ones own hand.

I would use a .22 RF if possible with my M03 and if I had a kit blaster, get one there as well.