I have an Interarms Mark X action in 300 Win Mag and want to rebarrel / rechamber to either 416 Taylor or 425 Express - any advantages / disadvantages of either ? Thoughts ? Thanks - KMule

Both are great rounds but with the .416T you have a broader & more economical bullet selection, .416 vs .423.

Doug's right,

I always get interested in an unusual cartridge but in the end the availability of quality components wins out.

I'd go with the 425 Express.
A) It's more unusual,
B) AEBE, a .423" bullet will go faster than a .416" (plus, the Express has a bigger case than the Taylor),
C) It'll fit right inbetween your 375 H&H and 470 Mbogo!

Here are (16) .423" bullets:
380 gr Northfork, 347/350/400gr RNSN and FMJ Woodleighs, 400gr X and 350/400gr Solid Barnes, 300/350/400gr RN Hawk, 400gr DT/L/M A-Square...
That's a few at least, and I'm sure I'm missing a few.
And how many do you need? A cartridge like this, seems you could do with just one that you liked a lot and go for it. Not like it'll ever be ideal for plains shooting.
That Northfork has the same SD as a 300gr .375, and according to Powley it should go about 2400fps at just over 50k CUP from a 24" bbl. Or, if you like, 2450 at just about 52k.
From what most everyone says, the Taylor tops out at about 2350 for a 400gr bullet. With the Express you could probably get your 2400 fps.

My 2 cents.

I'd go with the Taylor based on component bullet choice, barrel choice and die choice. I just don't see the benefits of the 425 express being worth the hassle. If you want more oomp then the Taylor in a std length 40, then consider a 416 Howell ie 2.5" 404 necked down.

Why not just go with a 416 Remington and have a commercial round with a proper head stamp if you want to go out of the country, thats kind of handy...opening that action to 416 is not a problem....or even a 404 Jefferys, my all time favorite big bore.

Lee bullet sizing dies will work with jacketed projectiles. Have Lee make you a 0.423 sizing die, size down 44/40 or 44 magnum projectiles and suddenly you have cheap plinking bullets for the 425 Express. The 416 Taylor is easier, but since when did that make it a better choice? Go with whatever makes you feel happiest.
Cheers...
Con

your mag is about 3.4" internally, right?

I assume you don't want to replace that with some $$$ or pay for that custom work...

416 taylor is an EASY bit of work... and cheap brass and cheap bullets, too...

I think ray has the right idea, but that extra o.25 is going to be hard to get, on the cheap.

so, order yourself some 458 winmag brass, hornady dies, and 400 gr hornady sp. Get a pacnor barrel, some necg sights, and have a ball.

jeffe

Thanks for the responses on this: I have always wanted to build a Taylor as it is very straight forward but the Express and the 404 Jeff (thanks Ray!) are reasonable alternatives and "do-able" - I have a gap in my rifles between 338 winnie and 416 rigby , know I should really work on a 375 - I am selling some rifles to acquire a more logical approach to caliber coverage (whatever that is ) thanks - KMule

Another big advantage for the 416 Taylor: Lee Precision makes dies, for $20.00

Todd