Given that my 35 Remington loads that noticeably exceed the SAAMI spec will get 12 to 13 reloads before a head separation is imminent and I really don't like shooting loads that heavy......I'd really have to question whether any load that gets only five reloadings before a head separation is prudent.
The 35 case has a larger interior head area than the 30-30 does, and if 30-30 cases are separating after only five loadings, and discounting a too long headspace measurement.......those loads are way too hot. Time to not shoot those any more.