how feasible is it to jump from insurance investment management to large asset managers (PIMCO, Capital Group, etc)

Yes, FI is very different. Have seen it done many times in FI though caveat being generally not directly to a PIMCO/Capital, but instead say more middle tier LO and occasionally a Blackrock/TRowe. No reason though why one couldn't make it to a PIMCO after an interim step as have seen people make it to Wellington/Fidelity after an interim stop. Have seen this both pre and post MBA though the switch during MBA is smoother. As above poster alludes to avoid equities because they are a rounding error for most insurers (if not for the throwaway fixed income reference their info would be pure misinformation for the median insurance experience). The more niche/higher beta the fixed income asset class the better chance/the more senior the position. I.e. an IG PM could likely make the switch, but a leveraged loans analyst would have a better shot than and IG credit analyst for example