Whats the issue with blazer 115 grain ammo and PDPs?

Saw over at the gundeals subreddit that theres 1000 rds of blazer brass 115 grain for $.20 cpr. Seems like a good deal however i see the blazer 115 ammo under the not recommended list for ammo. Also seen people post they had FTF issues using blazer 115, and saw the honest outlaw video where he was having malfunctions with blazer 115.

Anyone with broken in PDPs still having issues with blazer 115? Would something like a ultramass guide rod with 15/17lbs springs help the issue?