47 grains of H1000 and the 87 grain Berger with CCI LR gives me a Average 5 shot group of 3196 FPS on the magnetospeed.
I'm Very happy with this it is a factory Remington 700 CDL it will produce .4s-.5s at the 100 yard line all day if I do my part. I seat to magazine length most bergers like to stuffed in.
I also tried Retumbo and it did do very well in the 243 however a couple others not so much so I went back to H1000 to keep things simple.
I also have a custom 243 with a 1:8 28" Brux that H1000 will push a 105 berger out of at 3150 with amazing accuracy.
I will say this with 47.5 grains and LRM primmer is started to show some pressure sighns I went back to standard LR sighns went away and in further testing it did not increase velocity enough with LRM to even speak of and accuracy suffred slightly now this was just my experience.
it looks to me that your group could be tighten quiet easly play with seating depth for we all know bergers are very sensitive to it but looks like your on a good track
I love the 243 and H1000 and it sure puts the deer and antelope down with that little Berger in my neck of the woods