Originally Posted by JeffVN
I'm in need of some help and input.
I'm looking for something to consistently launch a .338 300 grain SMK (or other high BC .338 pill like the LM-105) to roughly 2,950fps. I've been told that the 338 Lapua Mag can't get there (quickload confirms this result), and I've been given the impression in my reading on several forums that the 338 Edge will potentially get there but it is puching the pressure envelope and is likely to be over pressure doing so in Las Vegas during the summer months - so that is a no go since I live in sin city. I know the 338AM gets there and beyond. Is there something between the 338 Edge and the 338AM that I don't know about? I'm not looking to personally wildcat anything too exotic...
If the answer is "no" to the question, then I gues I'll be looking at the various .375 chamberings.
YES there IS!! I have built and own several 338 Lapua Ackley Improved versions that spit 300 gr SMKs at 3000 fps. Also have built several 338 Edge AIs that will also do this.
I took my 338LAI to Africa last (their summer) and had no issues at all in the plus 100 degrees we encountered while on the hunt.
I have built a 408 necked to 338 but found barrel life was short, so far I have well over 1000 rnds through my 338LAI and no signs of firecracking or throat erosion yet.
WAMBO 338/416 Rigby is the same as 338 Lapua, the only difference is that the Lapua has a thicker web in brass. The 416 Rigby was initially the parent cartridge for the 338 Lapua but being designed for a lower pressure round case head seperations were high until Lapua altered the internal dimensions of the case thickening the web area.