Plan to put an ABC 1-7”twist barrel on an accurized Remington action. I’ve decided on a HV contour and plan on putting it in a McMillan M-5 stock . 1.) What powders would you suggest trying? 2.) Barrel length? 3.) Would you suggest bushing the the firing pin and going to a smaller diameter tip? 4.)The primer I would like to have a hard cup . Anyone make a quality small rifle primer CASE 6BR to give a safety edge for pressure?