Yes, it will only get worse if you leave if.

FWIW, my 375 and 458 bolt guns are also chronic copper foulers, but my 500NE is the worst of all in this regard.

There's a Cerakote product that you can use in your bore that minimises any fouling. SLRCoatings at Capalaba can do it for you or you can buy the product from him and do it yourself - his name is Geoff, I think. I know of two people who have had the treatment done and it works (one rifle was a 458Lott and the other a 505Gibbs).

I tried to do it myself on the 375 and 458 but it wore off after a while, but I probably didn't spend the time cleaning it properly before treatment - the bore has to be 100% clean before applying this product.