Keep in mind that the "bearing surface" of the bullet has as much or more to do with twist than weight does. A 50gr VG being a no-lead bullet will be longer and have more bearing surface than a traditional lead core 55gr bullet, hence the need for a faster twist than 1:12". If Barnes was that willing to send you more bullets then they may have had a bad batch get out and are trying to make up for it. I'd try the new bullets and see what happens. Also perhaps you are pushing them a bit fast, I don't know what the recommended speed for those bullets is so check it out. Also something to consider is that Savage barrels often have bores that can be a bit rough on bullets with thin jackets so its possible that those little bullets are getting deformed by the barrel itself. Slowing down your speed may help in that matter, its just a thought and something to try.
Good luck.
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