I know that most of the new actions designed for the WSM SAUM rounds will run a 350 Rem Mag fairly nicely. I also know about the 9,3 Sisk is based on the 350 RM. So natural thought was give it the AI treatment and neck it to hold 338 bullets. Wonder if others had done so and what they got out of it?

isn't the 9,3 sisk based off the 8remmag?

jeffe

Yep! The 9.3 BS (Barsness Sisk) Is off the 350 Rem.
The 9.3 Sisk is 8mm, however not sure if it is a la 358 Alaskan or not?!?

I used to know a fellow(he moved away) who had a MOA pistol chambered in 338x350 RM. He got something like 2400fps with 225 grain bullets out of a 15" barrel.

But wouldn't the 338-06 improved be very similar to what you are proposing?

Yes it would I think but if Olin/Winchester can sell us on the need for a shorter rifle I can think a 338/350 Rem mag might appeal to some. It would be a dandy little bear gun. Rem 660 or Ti action -- short and sweet.

I'm not sure how necking a .350 RemMag down to .338 would make it a better bear gun than the original chambering.

The only thing that would improve would be sectional density but at the range most bear are shot ???? plus you do lose a bit of velocity ---- for example, using a 225gr bullet, the .350 RemMag will produce more velocity that a 225gr bullet in the .338/.350
but as they say, "what ever floats your boat".

I think it is fair to say the the selection of 338 bullets can be a bit better than 35 caliber bullets. Also it seems to me that when they come out with a new bullet design the 30 cal gets it first with 338 not far behind.

Nosler Barnes NorthFork

I'm not sure what you plan to shoot but I'd be suprised if one of these bullet makers didn't already have something that will readily handle it.

But as I said there isn't a requirement that a wildcat make sense, all that's needed is someone wants it. Rnjoy yourself.

In a short action rifle wouldnt the longer 338 bullets create more problem with overall length than already exists with the 350 rem mag? I thought that was why Remington shortened the 338UM below the length of the 300UM. Just asking.

I agree the 350 is about right as is, especially in light rifles with short barrels. Of course if you are looking for something really special you could look into Water's 416 Express...

Wouldn't a 325WSM be just as good or better?

The 325 doesn't have the bullet choices of the 338 or 358.

I'd also say just stick with the 350 rem mag as is. While the 35's are unfairly tagged with the label of few bullet choices, it just isn't so. You have from 110 gr pistol bullets to 310 gr woodleighs.

That said, IMHO the 350 is best with a 225 gr Barnes TSX or Northfork. At 2700 fps it is plenty flat shooting, and there is no NA game that can't be effectively taken with it.

I am sure it has been done, but does anyone know if the 350 mag has been necked up to 375? If so, what velocities are achievable with 300 grainers?

My shooting buddy had a handgun done in the 375/350, I forget what the name of the round was or his velocities.

That said, generally when you jump up in bore, you can get a bit more bullet weight going the same speed as a smaller bore.

So the 350 rem mag pushes 250's 2500 fps, and the 375 would push 270's about 2500. Jumping up a weight, I'd expect the 350 to push 275's about 2300 fps, and the 375 to push 300's about 2300 fps.

Paul H, Thanks fpr the note. Lou

I'm not sure you can realistically run a 250gr bullet at 2500 fps in a 350 RemMag without topping out in pressure.

Bill, 2500 is certainly a top load, but not an overpressure load.

BTW, I leafed through my Barnes #2 manual, and they show 4 or 5 loads at 2500 and change with a 250 gr bullet.

I've never been able to get a Barnes bullet (except the old Originals) to shoot worth a damn in any rifle I've tried them in and the Barnes Manual has always been a bit of a puzzle to me as unlike the loads in other manuals I've have rarely been able to achieve the velocities they show ... that's with the older style X bullets --- have not tried the new ones with the grooves but understand they are quite good.

I had a Rem 700 Classic in 350 RemMag that shot patterns instead of groups with Barnes-X and the best I could do was about 2430 fps and that was pushing it for me. The Nosler's shot right at an inch and the velocities were better but 2500 fps (22" barrel) was never reachable with any 250gr bullet....and I tried.