Never use anyone else's reloads. Period. You have zero clue as to the actual contents.
The .244 isn't unusual, its just the 6mm Rem by its first name. Before my ex got it, I had a nice 700 ADL with a (lucky) high figure walnut factor stock. Was able to remove the terribly Rem plastic finish over the wood have the checkering recut by hand, and I finished the stock in pure tung oil (not the big box store stuff). Was a great rifle, a real tack driver and light on the recoil. When I took it out the first time after the "upgrade" to the stock, I chanced to meet a certain Florida senator.... and his son... practicing with a stainless 357 S&W (forget which). They both tried out the 6mm. This was back... oh... late 70's, so you can guess the senator.
Seriously, on using inherited reloads.... You meet an attractive gal in a bar, you're gonna get intimate with her, she tells you her "history", and you actually believe it and decide no protection is needed. NEVER USE ANYONE ELSE'S RELOADS.
Jeeeze 'o Pete, can't say that enuf. I was there when some fingers got blown off at Markham Park, on the hand of the guy NEXT TO the Super Blackhawk shooter who was "trying some reloads given to him". Just don't do it.
You should, disassemble the ammo, use the powder on the grass, and reload 'em with a safe load of your choosing. I always used 4320 in my 6mm. You shouldn't have to resize 'em if they chamber ok, so you might be able to "seat" new bullets after charging with a .243 die set in a pinch. The primers should be fine, or at least they'll be safe.