duragokid the .244 aka 6mm rem was designed from the reminton commercial 257 roberts case. The 257 roberts wildcat round was made from 7x57 brass. The .244rem is very close to the 7x57 but not the tru parent cartidge. Also the 721/722 and the later fanceier 725 rifles are still around today and buy far the best rifles for some years out. The 700 of today is just a cost cutting version of the earlier 721,2 and 5 rifles. And with the "new 243 "was offered in 1955 in the model 88 along side the model 70. The 88 was another great rifle design that just did not make it. To bad. The best guns of those days was buy far the 721/722 and 725 remington of the days. After the 700 came out the quality drop a a bit.