[ASH302]

I just did 275/40-17 on all four of my 17x9's
I would not put it on a 10.5.
Here is what i've learned, don't want to stretch the tire out, you want it to have a little roll. by putting the 275 on even a 10" you maybe stretching the tire outwards and it will cause stress on the seal.
I would say, save your money and get the correct size tire, do not cut corners. For sure not with tires.
If budget is an issue, you might be able to find some used tires that you could throw on the 10.5.

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ASh