I want to thank you guys for your responses. Plenty of food for thought. I was just running the idea through my head thinking that maybe the maximum cast charges would have plenty of pressure to shoot the jacketed bullets adequately and still be easy on the bore. Maybe the way to go is the reduced H-4895 route. Prwlr, thank you for the Seafire information. Very interesting. Looks like this Seafire guy has spent some serious time playing at the bench. Has he mentioned anything about tilting the rifle back to seat the powder next to the primer before firing the gun? Or does he use a filler of some sort. Does he have any Blue Dot loads for the .257 Roberts? Does he have a web page where a guy can look up different calibers he has experimented with? So with all this being said, thank you. RRM