.300 WSM or .300 Win Mag

[bobbyfairbanks]

If you plan on shooting 230 grain 30 cal then it’s time to pull your head out of forth point of contact and just build a 338 something

[smchop]

If doing a WSM and going 7mm DO NOT do a 7WSM, go 7/300WSM as it's a simple neck down from 300 WSM brass. The original 7WSM has a longer shoulder length and brass is nearly unobtainable and thereby needs to be made and fire formed from 300 WSM (or 270 or 325) whereas the 7/300, you just neck it down.

WSM's throated for a long action don't give up any performance to the WinMag/RemMag cases.

For example I have 2 rifles chambered in 7/300 WSM, my hunting rifle has a 26" barrel and I run 162's out of it at 3100 fps and change without breaking a sweat (I've run them up to 3200 but it's at the pressure limits for sure. (this one is a short action)

My ELR rig is the same chambering on a long action and throated to run 180 class bullets at full case capacity. It has a 30" barrel and runs 180 ELDM's with no pressure issues at 3150 fps. At our elevation it delivers a 180 ELDM at 2229 fps and 1985 ft/lbs @ 1000 yards. It goes transonic at 2550 yards. The only thing in a 30 cal and a standard magnum action that comes close is a 30 Nosler and it's not quite there.

For ballistics and energy on target the big 7's are very tough to beat. That said a 300 Norma is pretty impressive as well, but you're playing with Lapua mag actions in that case.

One thing I never understood was building a WSM or SAUM and having to use a long action. Whats the point? I mean I get it and why but you just cancelled out the whole reasons of the benefits of that cartridge. I agree on the Norma, but barrel life is still a concern for me.

If you plan on shooting 230 grain 30 cal then it’s time to pull your head out of forth point of contact and just build a 338 something

Why not build a .338 Win Mag that shoots the heavies that can mimic the lighter rounds of a .338 Lapua? I don't have the expense of a Lapua, a specific can for a Lapua, an action dedicated to a Lapua, but can mimic the ballistics. I agree the Lapua is a great round, I had one.

[XC700116]

One thing I never understood was building a WSM or SAUM and having to use a long action. Whats the point? I mean I get it and why but you just cancelled out the whole reasons of the benefits of that cartridge. I agree on the Norma, but barrel life is still a concern for me.


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But you don't, you actualize the potential of the cartridge, which is greater than that of a win Mag or Rem Mag due to the efficiency of the case design (hence 180's at 3150 fps) that and not having to deal with belted brass.

Cramming the bullets into the case to fit in a short action is cutting it's nuts by a lot. Will it work, yes but it's not at it's best. .284 win is very similar, it works in a Short action but is at it's best in a long action. Also consider that the cartridges were designed around the lighter end of the weight for caliber bullets, which are a lot shorter and thereby don't suck up the case capacity like the big bullets do.