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As @BrickMan says resin is the way to go.
The last time I used expanding bolts for work it was to hold shuttering for a single sided ~ 40ton ground beam that was single sided (TLDR a VERY complex concrete pour). We had to use expanding bolts as that is what was specified by the engineers at peri formwork and if we deviated before starting the pour the insurance would have been void. The issue of expanding bolts was raised, because they are shit, and they wouldn't budge. The expanding bolts were put into holes drilled by specialists and still failed because expanding bolts are shit. In the end the whirly bars were resined into place and are now still in the ground beam as they could not be removed - because resin works, unlike expanding bolts which are shit.
TLDR use resin not expanding bolts as expanding bolts are shit.
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Bobbo
Bit of a nightmare this weekend attempting to fit a mantlepiece. Long story short, having tried two sizes of expansion bolts, I’ve now got one hole too large for the 10mm fitting and one too large for the 12mm fitting.
Why does drilling masonry create such a bloody mess?! Am hesitant to continue boring because of the carnage.
Is there a magic polymer solution I can use to stick the bolts into the wall? Mantlepiece not load baring, just needed for nik nak display.