Regarding the 1 in 7 twist Lilja. It is a 3 groove. That combination may cause bullet failure once the throat gets rough. I believe in part it is the RPMs then the large surface area that is engraving the three lands impart on the jacket.
Some members here warned me years ago about using a 1 in 7 twist 3 groove Lilja. I chose 7mm Rem mag shooting to shoot the 180 gr Berger VLD hunting bullets. My friend used same barrel in 7 STW. Dan's 7 STW began damaging the jackets in less than 100 rounds with RPM being 329,142. Mine took longer approx. 200 rounds IIRC, RPM 313,714
I emailed Bryan Litz. He suggested I try the 180 target version which have a thicker jacket. This worked for around 50 more rounds when those bullets also were damaged causing wild diversions in POI at 100 yds. Bryan suggested moly coating. Did that and got another 50 or so round from the gun and it repeated its previous performance. I rebored the barrel to a 338 for another purpose.
Thought it was worth mentioning.