An observation on PC bullets.
One of my first batches of PC bullets for my muzzleloader was well over a month ago, I recently ran another batch in a different color and took both batches to the range. Other than the age and color, both batches were identical and the boolits were from the same casting batch.
The older batch was much more accurate than the new batch! I did not run the first batch through the chrony when I first shot them a month ago since I was mostly testing loading/cleaning, so I had no comparison of speeds or accuracy. The new testing revealed that the older batch was a little harder to start in the bbl than the new batch, but the older batch was about 4 MOA more accurate than the new batch shooting from a clean bbl. This must have something to do with curing of the PC.
My favorite load for my 458 SOCOM which is a 420 gn PC RN charged with 27.5 gn RE7, is simply super accurate (less than 1.5 moa @ 50 yds) for a socom, and is a joy to shoot. The length of the bullet makes it more stable than the 350s and especially the 285s which are just plain erratic. I was asked if it was good enough to hit the steel at 200 yds, I punched the numbers into my Strelok ballistics calc on my android phone, used the reticle mode to tell me where the scope lines should be and bang... .58 seconds later... ding! Now for you long range shooters that may not sound like much, but that bullet @1170 fps dropped 29.6 inches in 200 yds.
Overall powder coating is working well for me. My new Lee 160gn 312 2R dbbl cavity will arrive tomorrow. I will now see how much I have to slow down that bullet to get it stable as I have learned that PC cast bullets need to run slower than traditional plated or cast.