[jamesf553]

Originally Posted by Mississippi

In short , no .004" isn't going to make any measurable difference as far as pressure in a .338 LM because the internal case volume is so large. Even a .01" won't make any difference.

In something like a .40 S&w or other short pistol cartridges, it will make much more difference because of the lost volume relative to total volume.

The only time in a cartridge that large, where you will get a pressure spike from such a small adjust is if you INCREASE the OAL and it puts you into the lands.

FYI, 80 gr Retumbo is a pretty light. In mine I use the 300 gr smk to around 2880 fps which is about 92 gr Retumbo in my M98B.

Gotcha. Yeah I just picked middle of the road between what hodgens site said. I'll work upwards now that I know it's safe