RE: Traditional & tight groups??
I have basically what you are looking at getting. I have a Lyman GPR 54 and recently got the50 GPH barrel for it. I have the 57 peep on it and the 17 front site on the GPH barrel. While schedule and weather have not allowed me to get to the range and shoot it yet, I expect the hunter barrel to do well with conicals. The load I'm hoping to get going is a 460 No Excuses conical over 70 to 90 grains of 777 for a velocity of around 1400 to 1500. At those speeds the only thing that will keep me from taking down an elk is how well I can place the shot. It will have over 1000 FP of energy out to at least 400 yards so range becomes a matter of shooting ability not whether the load is up to it or not. When sighted in for an 8" point blank range it gives a point and shoot to around 160 and it should be down about 12 to 14 inches at 200. I just need to go to the range and find the most accurate powder load for it.
Good luck and let us know what you get.