I'd look closely at what is happening. See exactly what the cartridge is doing, is it hanging up? The ejector should be somewhat stiff to push and move freely. Could be a bad spring or the pin binding. They are easy to get out.
A new spring, pin can be ordered from World's Largest Supplier of Gun Parts, Gunsmith Tools & Shooting Accessories - Brownells
for less than $10.00 including shipping. Look on the left side of the main page, they have schmatics, just pick the correct one for your rifle and order the parts right from the schmatic number.
Be sure the cartridge fits the bolt head correctly, if not, send it back, but I'd check it out before sending it back, it may be a simple fix and packaging, shipping costs etc are a pain in the rear.