Re: !!! 300 WSM Lapua brass !!!
I use a gram scale to 4 decimals since I work in a lab. I weigh all my powder charges into vials at work, then just dump them in at home. If your scale is good to 4 decimals it will be enclosed to protect the readings from air current disturbances. With the door open the reading will wander say .0005 grams. This is OK since a piece of H1000 powder weighs about .0020 grams. I just put one vial on the scale and leave it zeroed. Then fill the vial, trickle up to the weight, dump it into other vials, and put the vial that is already zeroed back on the scale. I can do about 50 powder charges in 20 mins, accurate to one piece of powder. I resist chopping pieces since this increases the surface area, and the powder was designed to burn in the size they come in. Also chemical deterents are soaked into powder pieces to slow the burn at first when the surface area is largest and they gradually allow it to speed up as the surface area decreases during the burn. This allows the powder to burn progressively or at least not regressively. Cutting the pieces exposes the inner parts at the beginning. Of course I realize that you are only talking about cutting one piece. My friend did some tests where he observed higher pressures when he used a powder thrower that seemed to crush some of the pieces vs pouring them to the same weight.