If you are happy with the scope, the only thing I would suggest is the stock...The Howa is a very good action, reliable and usually more accurate than most shooters are capable of .( Mind you so are most new rifles.....)
A new rifle will require you to sight it in, retool with more ammunition in the correct calibre and practise setting up and getting used to the rifle....I have found that changing from one calibre to another will cost you a few packets of ammo to start with anyway and at todays prices that will exceed $100 to $200 pretty quickly so in my view that would be better spent improving what you already have.
The only thing to watch is going lighter will increase the felt recoil no matter what you end up with. To be effective at 300m + first you have to be able to hit it at 300m +. You could have the hardest hitting 50BMG and yet if you cannot shoot it accurately it will simply make a bigger crater in the ground....
Going from 7mm to 270 wont gain you much- they are very similar calibres. Capable of very similar performance...And if you look at factory ammo speeds and energy, tho be brutally honest , the 7mmRemMag is not a huge amount faster / more powerful...If you want more bullet then 7mm08 to 308, or 270 to 30/06 there is a little bit of gain, but again not enough to warrant significant outlay.
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