Absolutely. The most likely cause is a material/ manufacturing defect but having voided the warranty by choice it's doesn't matter. If you buy a car, don't service it for 50000 miles then take it to the garage with a blown engine you aren't likely to get a warranty replacement as you haven't followed the manufacturers requirements on service intervals. The engine may have blown at 50000 even if you have had serviced it as required but then the garage would not have been able to turn away your warranty claim on the ground of non conformity with its terms.would agree with this, with one proviso, if the fault was a failure due to manufacturing defect ie metal fatigue, the problem is no one has seen an independent report as to the suspected cause,so no one can really feel safe with one of these rifles, its OK if its your rifle and you know its only had factory through it, but what if its second hand? this may have some knock on effect on all owners of this model, as resale may be problematical.
With regard to failure of a second hand gun, I would suggest that if the warranty is transferable ( I don't know if it is or not) and the second owner took it back without making a statement about having used home loads then the dealer / manufacturer would be none the wiser about the first owners ammunition usage and therefore have no reason not to honour any warranty due.