Wow, it's really strange you should mention those calibers!
I was going to build a 300 Lapua mag, and decided against it because of the performance of my 300 win mags and 338 Lapua mags. Just couldn't justify it.
Then yesterday, I was in one of those moods where I'm kind of itching to do something, and I start researching the 7mm caliber cartridges and the 7 mm STW was my choice if I decide to get a 7mm. Then I started thinking about well why not just open the bore a bit and do a 308 Super. Then that thought process led me to the 300 RUM.
I see what you're saying about game animals, and I get it. For just about every animal I've harvested, I could have used the 8mm Mauser I started out with over 40 years ago, or the 30-06 that was my second gun. Could have saved allot of money I've spun around this hobby.
I really love hunting and harvesting animals. It was that love for the hunt that exposed me to firearms, and then I discovered another thing about me. I really do enjoy firearms, hand loading and shooting, all unto themselves. I have my whole life.
For me, It's long ago past what the animal will notice about what I use to harvest him. It's firearms for the sake of firearms, and has been for while.
Have a great Sunday, WildRose!!