Re: 338 lapua or 338 ultramag?
Balistically they are close and will do the same thing. But the Lapua will usually have more velocity for a couple reasons. The Lapua has better brass available, no question there. People that have not owned both will complain that the Lapua brass is more expensive at about $2.65 a piece. But in all reality the Lapua is cheaper to shoot in the long run as the Lapua brass will out last the Rem brass by 3 times or more. This is especially evident if you load them both to max where you could see the Lapua brass last even 5 times longer. They are both long range elk hammers with 300 gr bullets and for most general purposes both will do the same thing. I find a good deal of accuracy in all my rifle with well prepped quality brass. I hate to see it wear out quickly after all the prep and truing, so I prefer the Lapua brass. Plus if you start prepping each you will soon realize why the Lapua has a higher initial cost. It definitely shows in the quality and consistency. They both will send the same bullet, use the same primer, and like the same powders. The Lapua will in most cases use about 3 gr more and that is part of where the extra velocity comes from. But the cost of shooting them is close to equal with a slight advantage going to the Lapua for longer brass life. I have owned them both, loaded for them both a lot, shot them both a lot and like them both. But if I am doing a custom build I will look for quality brass availability before I choose the cartridge.