I recently passed on buying some .308" 168 matchkings because they were obviously pulled with a pliers. The guy didn't want much for them but I figured
A- they wouldn't be accurate
B- they may harm my barrel.
Was I right in my assumptions?
I read a test quite a while back where bullets had the tips deformed in many ways from flattening them to cutting them completely off. Then they also deformed the bases on other bullets and tested those, also.
The bullets with the tips deformed shot about normally at 100 yards. I believe they lost accuracy past that point, but not rapidly. The bullets with the bases deformed lost a lot of accuracy at 100 and much more and rapidly past that.
This may not exactly answer the question but should give you an idea that the tip of the bullet is not nearly as critical as the base.