Wildcats based off 7mm mag action.

[yorketransport]

The 338 and 358 off of a 375 Ruger are simple neck down size jobs. The 338/375 uses a 375 Ruger die to size the body and a 338 RCM die to neck size. It will match the 330 Dakota but with less expensive brass and dies. This is a 30-06, 338 win mag and a 338/375 Ruger.

[b23]

I like the 6.5 Blaser idea!

If nothing else, you'd likely have the only one in existence and that alone would make it worth it. 

[RadSav]

270 Weatherby should be an equal case length swap and no bolt modification.  Performance is quite impressive.  257 Weatherby would give a little more room to play with seating depth in that same action too.

I also think the 30-338 Win is an even swap with both magazine and bolt head.  I spent a good bit of time with a 308 Norma and loved it!  30-338 should be dang near identical to my old Norma, but I think it gives you about .050" more room in your magazine.

[theleo]

Since you're getting the 28 built you might as well go towards the 257 Weatherby or with something that makes a bigger hole than a 30 cal. The 358 Norma should fit and you could keep your bolt, but it's not a wildcat.

[Bill W]

I imagine plenty of people have already taken a 7MM Rem Mag down to 6.5 MM, but that would be pretty cool......

Winchester did that back in 1959.  .264 Win Mag.

And it became a legend as a barrel burner.  The velocity was to fast at around 3400 FPS, barrels did not last long and they were shot out.

I don't know if you ever owned a .264 as it doesn't seem so.   People used to talk about how the .220 Swift burned out barrels and how bad the .17's fouled.   Most of the talkers never owned one.

At one time I had 3 .264's.  Two pre-64 Model 70's and 1 Remington 700 Classic.  I don't know where Winchester got their velocities that the original claims were based on.  Later the published velocities were revised downwards.  The 140 grain ended up with a published velocity of 3030 fps, downwards from the original 3200 fps.  I do not know where the 100 grain factory load ended up.  Originally it was at 3600 fps.

Any high powder capacity, overbore cartridge has the potential to burn out barrels.   Even a .223 will burn out throats if the shooter gets it hot enough.

If I had to do it all over again instead of a .264 I would have purchased a 7mm Rem Mag as there was lots better bullet choices in the past.    Now it doesn't seem to matter what caliber one has.  There are lots of options and premium bullets available.

[slm9s]

There's the new 6.5x300WBY.

[bullfisher]

I am having a 28 Nosler built my Michael at Hells canyon armory. I have a sako 7mm mag that I am wanting to re-barrel in something else.  Leaning towards a 6.5 SAUM, or 6.5 wsm.  I would like to use my same action and bolt.  Curious what other people have done with building off a magnum action?

Are you having it built to 195gr berger mag length? You will eventually gravitate towards the 195's and they end up about 3.7+" in the 28 i believe.

[hogslayer]

I am going to stick with the 180 hybrids.  I have talked to a couple people that ran the 195s and when you factor in the fps gain of running a 180 hybrid the extra bc of the bullet isn't worth it.  And from what I have heard they are really finicky to shoot correctly.  But I am going with a 1:8 twist so I could.  But already bought 200 rounds of 180 hybrids and 10 lbs of retumbo.  Let's just say I am going to make that combo work!

[theleo]

  But already bought 200 rounds of 180 hybrids and 10 lbs of retumbo.  Let's just say I am going to make that combo work!

Or have a lot of 180 Hybrids and Retumbo sitting next to the reloading bench.