by Seismic Sam on Sun Mar 10, 2013 9:59 am
There was only one member here who had one that I know of, and it was RAGGED, and I haven't heard from him in ages. I have the equivalent Remington cartridge, which is the .338 Ultramag, and my rifle is a Remington 700 Sendero SF that is a full JP custom job, back when he was still doing bolt action rifles. The .338 Lapua is a slightly larger case, but less efficient, so for both rounds the maximum spec for the 300 grain Sierra Matchking bullet (BC of .762, which is equal to some 50 BMG bullets!) is 2750 PFS with about 102% powder density. You MUST have a gun with a brake, and having a Picatinny rail with 30 minutes of slope in it is also a plus. The big Savage bolt action is probably the one to buy these days, and the original Sendero SF is no longer made.
As far as going with a 30 caliber round, forget about it! the BC's of the 30 caliber bullets just cannot compare with the 300 grain Matchking, which BTW is pretty much the same diameter and length as a .223 CASE! In particular, nobody uses the 300 Weatherby Mag for any long range work, because the barrel has is freebored, meaning that you cannot seat the bullet 10 or 20 mils off the lands, which is one of the tricks you have to employ to get the real accuracy out of a long range gun. You will NEVER see a Weatherby at any long range competition for this reason.
I think Retumbo is the powder to use, but some of the new manuals says H1000 is better. Only primer to use is Federal 215M Match.
Now then: The 338 is a full-on benchrest cartridge for EXPERT reloaders only, and if you don't know all the tricks and tweaks, forget about it. YOu MUST have a chrono, period. It's best if you buy your brass from a single box, (like 500 or 1,000 cases) weigh them all and select the half that are closest together in weight, and then sell the other half to some n00b who doesn't know any better. You may or may not have to neck turn all your brass. You will need a runout gague to measure case concentricity, and know how to use it. In addition, the easiest thing to do for dies is just buy the Redding benchrest comp dies for BOTH resizing and seating, which is probably about $300 these days. If you buy any other dies, like Redding S neck dies, you are in for a world of pain and confusion, because a neck die does NOT guarantee tht a fired case with a resized neck only will even be close to being concentric. You also meed to figure out the seating depth so that the bullet is consistently x mils off the lands, and how to measure that accurately. if you accidentally screw up and jam the bullet into the lands, you can have a nice big KABOOM! We're talking about lighting off a full 100 grains of powder here per case!!
I could go on and on, but I think you get the idea.