Very interesting, thanks jakola. i'm thinking about loading up some cast for my 1948 32, and my 1950 30-30. I will check the 32 for the twist rate.Kind of late replying, but read with interest the comments regarding twist rate in .32 special rifles. I have two of them and checked the twist rate. First is a Marlin 36RC serial number D20581 (1947) with a twist of 1 in 10". The other is a Marlin 336A serial number K37303 (1953) with a twist of 1 in 16". So it appears that RIF is correct regarding the faster twist in some of the Marlins made in the late 40s. Interesting to note that when the 36RC was roll stamped, The M in Marlin ended up underneath the fore end band. Hmmm. Don`t know about bores being undersize (.218-.219)??