Re: Need help 338-378 wby
I also use the Reloader 25 in my 338/378 Accumark that powder works great! I average about 40 fps shy of WBY factory ammo figures which with my chrono experience is a bit enthusiastic to start with. A moose or a bear won't be able to tell the difference between 3000 fps and 3100 fps anyways as bullet placement is what really counts for any caliber.
Just as a heads up guys I found that Retumbo has erratic pressures with bullets less than 250 grains, especially the 225 grain TTSX and Hornady SST. I contacted Barnes and they had the same experience and decided not to use it in their manual for that reason, neither does the latest Hornady manual. They recommended R25. I'm still waiting for the Barnes 265 TTSX to appear on store shelves here in northern Ontario but I would used the load data for the 250 grain and drop it about 3 to 4 grains to start and work up from there.
This is a great cartridge for sure and I took the time and effort to break in my barrel and it paid off in spades as I get almost no fouling at all but then again I give it a good scrubbing with Sweets every 20 rounds or so and never let the barrel heat more than me being able to hold on to the barrel. Should last me the rest of my life. I just wish we had bigger bears around here! LOL. Well we do have Polar bears just about 400 miles north of here but they are expensive to hunt. I hope this helps.