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Seems like a bad idea.
First of all, the length of the copper bullets may not be the most important factor for increasing the pressure over what is expected from lead+gilding metal bullets. The pressure increase may be more because the bullets are harder to engrave into the rifling.
Without knowing the powder used in your store-bought ammo, it is not easy to know what the increase in pressure would really be.
If you are willing to go to the trouble of pulling bullets, resizing case necks, and seating new bullets, you are doing most of the physical work for reloading from scratch, anyway. Seating primers and measuring powder are not the much work or expense.
The other part you are skipping, learning how to do it safely by working-up your loads, is a dangerous attempt at a short-cut. It might work-out OK from a safety standpoint, or it might not. And, it is unlikely to work from an accuracy standpoint, because you will not be using a power that was selected for the bullet you intend to use, nor will you be adjusting the powder to obtain the best accuracy in your gun.
SL1
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