Hi, new to the site but old fart caster. Working up a load for my 300 H&H Ballard highwall (pic below) with my new NEI 210 gr driving band bullet.(pic below) Naturally the HW is throated for jacketed bullets so I have to seat them way in (love the l-o-n-g 300 H&H neck). Starting with 25gr 4198 to duplicate 30-40 Krag. Am trying cornmeal as a filler and also dacron. In the past (other rifles) I have also used Ballistic products shot buffering with good results. Thoughts, experience and opinions appreciated.
(Have essentially the same NEI mold in 35 & .411, both are very accurate)