Just purchased a used Dillon RL-550B on Ebay, along with other items needed to reload .45 ACP. I purchased Ranier Ballistics lead safe bullets in 230 gr. ball and 200 gr. JHP from Dillon. Got those today in 500 pc. boxes, as I examined them the have very slight dents from being packaged in bulk. My experience in shooting an Enfield M1853, 3 band musket for accuracy, caused me to fabricate 2 bullet sizing dies, 1 for hunting and 1 for timed stake shoots. The sizing die for hunting was sized 0.0005 larger than nominal and yielded 3 inch groups at 100 yd. using a soft lead round nose Minie ball and blackpowder. The die for stake shoots was 0.0015 undersized to allow for fouling.
My question for you experienced reloaders who load for accuracy is this; should I size these bullets to improve their accuracy? Will it make a difference in IDPA shoots?