Help regarding expansion bolt and drill size?

I got one of these expansion bolts:, the Type O eyelet M10.According to the site where I bought it, they said drill size 14mm. So I got a SDS plus-7X 14mm diameter.Did hit a couple of small pieces of rebar, but overall the drilling went really smoothly.Now, when I try to insert the anchor into the hole, it wont really go in to the hole all. Certainly not with hand pressure at least.I tried hammering slightly, but even then it wont go in, and I am afraid it will get stuck half way, so aborted that and pulled it out.I have ran the drill in and out several times at high speed to smooth out the hole even more, but still it seems to not fit.What should I do? :S via /r/DIY

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