Originally Posted by elkaholic
Mark...I went through a few pounds of RP ultra brass with my 3 ultras and I have to agree that the RP brass is only good for about three firings. You may also find out that sizing the web down to acceptable is also a problem at about two-three firings. A .550" case should size down to AT LEAST .0002" under to not stick in the chamber and NONE of the dies I tried would do it. New brass of that diameter head is usually approx. 005" under for a reason.......Rich
Yeah Rich, I know all about it. Early in my 300 Ultra career I got three case stuck in my Redding body die and it took a crow bar to get them out, at least that's what I used
I figured out that I needed to size them a little at a time working the lever up and down till they were full sized.
Got home from the range last night from working up 4 bullet powder combinations and all the brass on the upper end of the pressure spectrum needed the special care on the body sizing and primer pockets were loose.
I blew out one primer pushing a GS 177 @ 3600 with 93 gr of RL17. It took quite a bit of force to get the bolt up. The charge before, 92 gr, showed a flattened primer but easy bolt lift and about 3550. When I tried to seat the primer in that pocket, it fell out. The 91 gr held the primer, but very loose. All easy bolt lifts and somewhat flattened 215 primers and some ejector marks. the external pressure signs were similar from about 89 gr to 92. RL17 can be weird sometimes.
With your 210's I got to 94 gr of Retumbo showing about 3130. I just ran that case through the body sizer with some Imperial wax that i just got and the case went through smooth as silk. The primer pocket was a little loose but offered a little resistance. I think that's the max for your 210's. I shot a Berger 210 with 93.5 gr of Retumbo and the chrony showed about 3170. So I'll be loading the rest of your 210's with 94 of Retumbo to do the drop testing.
But you're right... if you want to push the 300 Ultra, the Rem brass will be hard pressed to last longer than 3 firings. with Lapau quality brass I could probably be pushing those GS 177's well over 3500.