So I purchased a new, never fitted B&C sporter stock for my 98 Mauser. It needs work. I think it's a '90s vintage model and doesn't fit my bottom metal very well at all. I've been catching short blurbs/mentions of "bondo-ed" stocks and even saw a Rem 700 stock for sale here recently with that mentioned in the description.
If my stock has big gaps around the bottom metal, is bondo the correct material for permanent repair? I think the receiver itself is going to fit just fine once I'm done fitting. I plan on fitting, pillar bedding, then painting and sealing. It's quite a project and I'm not totally looking forward to it but for what I paid for the stock I think it's worth it.

Any advice/experience is welcomed.

Thanks.