We have been testing the 280 grain and 265 grain .338 bullets Greyghostt makes and found out some interesting information when defining the pressure limits for the particular type of powder. We were pushing them to the pressure point in a 338 Lapua Improved that I designed so that we could get five reloads from the factory 338 Lapua case after fireforming.
Here is the best part. No copper fouling in the 338 Lapua improved with the Hart barrel. We tried it again in the 338/378 with the K&P barrel and the same results. Not copper fouling at all. We tested both barrels for copper with both Shooters Choice and Sweets used seperately of course. We then introduced the bronze brush to ensure the chemicals were working and that produced copper.
The 265s (.770 sea level BC) yielded 3210.9 fps (222.1 fps higher than the 300 SMK) and the 280s (.878 sea level BC) yielded 3109.6 (121 fps higher than the 300 SMK) out of my design of the 338 Lapua Improved in a 30" barrel. We certainly could have gotten another 60 fps out of the case, but it would have been at the expense of brass life.
He is working hard producing the sample bullets to send out. Don't miss out on the free test bullets and shipping. Again, Greyghostt's email is firstname.lastname@example.org
if you are genuinely interested in trying the bullets.......
Have a nice day.