The 330gr Gould HP cast in pure lead and correctly sized is a great bullet for the 1-30 twist ML rifles.
Lyman used to offer the same bullet without the HP. Mold #457192 instead of #457122. They have been gone for a long time (1970s) but pop up occasionally on ebay.
IMO somewhere around 405gr is gunna be the max a 1-30 can handle without pushing the bullet too fast. They might be fine at shorter ranges but as you saw they can start to "wobble" as the range increases.
Last edited by Gm54-120; 02-22-2017 at 07:17 AM.