Re: 300 win mag & 180 BT & H1000
For plinking with 165 and 180 NBT's I have found the best results ( speed, accuracy, low ES, etc.) With Imr4350. I seat 180s .030" off the lands and use 73grns of Imr4350 and do the same with 165s with 75grns. You will use a lot less powder and no need to use magnum primers. You will need well over 80grns with H1000 and a CCI250 or fed 215m and your extreme spread will open up with H1000. If you must use H1000 I'd start at 78grns and work up.