I just got home from the shop, that is where the 300 ultra brass is. If I remember correctly, the comic books stated that the UM case has 13% more capacity over the 300 WBY. Based on that I ran with a case overflow of 113 gr of water. If it is much different than this, post the volume/weight.
90 gr RL 25, 220 MK 3.65" oal, 26"bbl, Case volume of 113 gr. water. 2925fps/58500psi.
I have found that using 58000 as my max number corresponds well to what I have read on my brass. Asking for a 65000psi load results in primers you can remove with a good puff. I have found that QuickLOAD is right on the money with Hodgdon powders, but it out with RL-XX. Use caution, start at about 80 gr of RL 25, please don't sue me....
Since your feeling so generous. How about a load for a 270/300Rum using a 135 grain MK and 150gr nosler ballistic tip with H870 or AA8700. A starting load would be best, somewhere around 50-55K psi.
Thanks in advance.
OH! Almost forgot, I measured the 27/300 case and overflow weighr was right at 112.5 grains of water.
I realy needed a good reference point and that's what you gave me. The only thing close that I had to go off of was 7mm Rum load data, but I was realy kind of hesitant to use that for fear of overload.
I Promise I won't sue. I'd rather be out lots of money than put money in a laywers pocket.
Pleased to have found your site Mr. King, I have lots of questions of my own yet, hope to answer more than I ask. I am not a lawyer Mr. Smith, but a lawyer would have a hay-day with me it he could. I manufacture rifle actions up here in Canada, on a small scale, but growing. I have this really neat action in .338 Lapua I'm developing loads for right now.........question to follow in appropriate forum, bed time.