I always anneal brass before I start using it - regardless of brand. I have had split necks on first firing of Norma, Weatherby (made by Norma), Winchester, even Lapua brass. None since I started annealing. I haven't fired Bertram brass without annealing. The only issue I had with Bertram brass was with 500 Jeff - it didn't quite fit (too tight) into the shell-holder until I ground a poofteenth off the shell-holder with a dremel.
Bruce is sometimes the only source of obscure calibres.
He is also the only hunter I know with a full body mount of a Giraffe in his home.