Sprue "shaver" or base "truer"?

http://castbulletassoc.org/view_user.php?id=7960>Pentz

Sorted for match grade cast bullets means 1% by weight. Closer weight matching than 1% does not make groups smaller with cast bullets.

Good casting skill will do that. The best method controlling bullet weight within 1% for me is timing so I can open sprue cutter with  a gloved hand pushing down and opening up the cutter plate leaving a smooth cut with no chunking of sprue hole lead due to opening at the wrong time. Traditional tapping with a wooden billet to open cutter plates allows a poor fitting cutter plate to work cutting high or low depending on how you strike. That sends bullet weights all over the place.

It takes a practiced skill to glove hand open a mold and that is NOT an easy skill to develop. There is no tool that will do this.

Keeping pot temp stable is also important. I use a PID temp controller and only drop sprues into the pot when starting a new batch. This keeps temp pretty constant also helps bullet weight consistency.

Knowing how to check cutter plate fit when hot and adjusting if necessary will also help.

Dont pick a random number that you think your bulllet weights should be matched within. 1% is the match standard. So if your bullets average 250 grains for example, all bullets weighing plus or minus 1.25 grains from the average 250 grains are match grade matched because 2.5 grains is 1% of 250 grains and midway of 2.5 grains is 1.25 grains.

Gary