I also have some 55 grain Hornady SP's I am going to try to work up a load for. I hope they work good since I have about 500 of them. Not planning on shooting over 55 grainers with this rifle. If planning on going heavier, I will get the 243 out. I use it for anything from 55-100 grain loads. The 204 loves to eat 32 grain pills.
My main goal with this rifle is to see if it fills a space between my 204 and 243, or to find out if there is no need to try to fill that space.......
At one time, it would make its own space due to the price of cheap shooting. With today's component prices, it might be hard to justify another round if it doesn't have some specific characteristics over my 204 and 243. I am not one to have a ton of different calibers.