What is the difficulty of reloading 8mm mauser?
Yes but new brass is available.
What the OP may be referring to is that reloading, and ammo selection in general, for the FN49 carries some cautions to reduce the risk of out-of-battery incidents, especially in the Egyptians which didn't come with a firing pin safety stop (FPSS).
Conventional wisdom suggests ensuring the FPSS is in place on a rifle so-equipped, that the rifle has a two-piece (rather than a one-piece) firing pin, that firing pin protrusion be checked and that harder milspec primers such as the CCI 34 be used in all reloads (CCI 250 or 200 as next best alternatives). Primers in factory ammo may be soft enough to be set off by the returning bolt before the bolt is in battery.
Well guys, so much for the FN49 being a saleable item. I have had mine for sale on the EE for a couple of weeks and haven't even had an inquiry. Now, I did start it off quite high and then added "OBO or interesting trades" but still no action. What I find most interesting is the number of Bitza Garands which are put together from parts that are going much higher than what I was asking and being sold at those prices. I am guessing it's just a trend. Nice rifle and I have the dies and all so I will continue to play with it. I have really enjoyed the posts here. Thanks to all, Dave