This past Sunday I shot a series of loads to experiment with 5744. I loaded 5 rounds each of 24gr. 5744, Lyman 457193 sized to .459 and each group of five had a different primer. WLP, WLR, WLRM and CCI #34. I was attempting to see if primers made any difference in the amount of unburned powder left behind. I also loaded 5 rounds each of the same charge with the Lee 459-405HB sized to .459 and WLRM and CCI #34 primers. I would shoot one 5 round batch, observe unburnt powder in the bore then wipe bore before next batch. At 100 yd. all rounds are impacting within the 10 ring of the SR1 target. The curious situation occurred when shooting the Lee loaded rounds. Bullets are impacting 2-3 inches to the left of point of aim yet the groups are tight. This is a WTH for me. Both Lyman and Lee bullets weigh around 400gr and both sized to .459. The only difference between the two is the lube used. The Lyman bullet is lubed with Rooster Red and the Lee bullet is lubed with Emmerts BPCR lube. Could the difference in lube have caused the difference in POI? Any ideas?
BTW, the WLRM and CCI #34 primered loads left the least amount of unburnt powder. Makes sense, hotter primer more complete burn.
charlie