Many manufacturer's sell a loading jag that is mated to fit their bullets so as not to deform them. If your manufacturer does not (sorry I have no experience with Buffalo SSBs) you may be able to sub in a loading jag from a different manufacturer or vendor and avoid the deformation problem.

There are several who sell them one should be close enough to the shape of your bullet to make it easier for you, just take a new round with you when you go to look.

Hope that helps ya out.