I have a new sparked interest in this wildcat 375-338 mag. Has anybody used this round in the field? Also has anyone chronoed this round with 300 grainers?

yes, and the the 375/300 win ..
and the 376 steyr, and wanting a 375 ruger

a 375ruger will clean up a 375 chamber. has factory brass and dies ..

can you get HH, 2500fps with a 300gr in a 375 taylor? yep ..

I did not go the 375 route with the 338 Win case, but did 9.3 or .366. I am not pushing things at all in it and get 2550 with a 286 gr bullets and 22 inch barrels. So getting a 375 caliber 300 to 2500 fps should be simple and not pushing things.

Fun little cartridge too!

Michael

I have a Ruger 77 that I had rebarreled by Pac Nor in .375/338, 24" stainless. Very accurate and not fussy. It matches the .375 H&H ballistics with no strain. It's a favorite!

Many years ago I built a couple. Like those before me, it will do everything the 375 H&H will do with all bullet weights. Very eficient round. Hammers Moose!

Hammer

Be real careful what you ask for here guys,

I know because I went thru all this crap with my 416 Taylor, The Gunsmith, chambered in 338WinMag and necked in 416. I had some fired 416 Taylor rounds and could not chamber them, couldn't even close the bolt.

I think if you check the drawings you will find there is something like 50 to 60 thou more length in the shoulder of the 416 Taylor. The 416 Taylor is a 458 Necked down, not a 338 necked up, sound the same....no it isn't, the shoulders are at different hights

So I'm sure there is a difference between a 338-375 and a 375 Taylor. Load data is pretty much the same. If you had the chamber cut in 338 -375 and had a set of 375 Taylor dies, you would get one maybe 2 firings out of the case and then you would find it hard to close the bolt, because the 375 Taylor FL resizing dies wouldnt be pushing the shoulder back to 338 length.

regards
S&F

If you don't believe me, Here's the example, I hope you can make sense of it.

do a simple drawing, of a bottle neck case with angled shoulders like a 338 case, now draw a wider neck on that case in say 375, all the way down until it meets the angled sshoulder of the 338 case. This makes the neck longer and the shoulder starts lower. (338 - 375)

However now in a different color pen draw the wider 375 neck but stop where the 338 shoulder starts don't go all the way down to OLD 338 taperedshoulder, oops you should notice there's a gap, now you have to draw in new shoulders a fraction higher......yes indeed it's a different case

ShortandFat, I neck up .338 brass for my .375/338, rather than neck down .458....it's closer to the end product. However, whether I run .338 or.458 brass thru the .375/338 form die, the shoulder still ends up in the same place and chambering is not an issue.Pac Nor doesn't list .375 Taylor as a wildcat on their list of calibers....just the .375/338.

quote:

Originally posted by PhilR:
ShortandFat, I neck up .338 brass for my .375/338, rather than neck down .458....it's closer to the end product. However, whether I run .338 or.458 brass thru the .375/338 form die, the shoulder still ends up in the same place and chambering is not an issue.Pac Nor doesn't list .375 Taylor as a wildcat on their list of calibers....just the .375/338.

This would indeed be the case with a 338-375 die and chamber. Down sizing 458 Brass with a 338-375 dies would also work because it pushed the shoulder back to where it should be

And yes a 338-375 case would chamber and fire in a 375 Taylor chamber, the shoulder would just move forward, because it head spaces off the belt

If however you had an original 375 Taylor die set and you tried to neck down 458 brass, you would notice the cases wouldn't fit into you chamber, the taylor shoulder is further forward.

If you tried to open up 338 Brass with a 375 Taylor die it would also work, but more like a neck sizer because it wouldn't be resizing all the way down to the shoulder. Eventually the shoulder would grow too long to chamber properly in your 338-375 gun, and cause a headspace problem

I had Marchall Chase of Ithica [the gun doctor ] make me one [the 375 taylor version]about a year ago he bought and rebareled and restocked a left hand ruger 77 II african style added a merc tube and sent her along to me [say 9 1/2 #] I got it shot the round through a speed trap on 10/19/08

270 gn hornady .375 gn soft point 4064 64 gn 215 fed primer 300 win mag brass sized up [this shot, fire forming shot]

2734 fps
2731
2751
2742
2737

recoil like shooting a 300 win mag big gun that end little bite this end

I also had Chase make me a 425 express at the same time same ruger and all so heres the stats on that one

425 express

.423 400 gn barnes x fed 215 primer 68 gn H 4895
4458 win mag case necked down [this shot, was the case fire form shot]

2310 fps
2296 fps

I have a 375-338 that I built for this years Elk rifle on an old Ruger 77 tang-safety action. I ran it through its paces yesterday at the Montana Big Bore shoot. I haven't chrono'd any loads yet but will soon.

how did it feel shootin

whats the final build weight

whats your load

thanks frank

Frank,

It shot good; I won the "peashooter" class, .358 to .375. It weighs about 7-1/2 lbs. with a 21" barrel. Perfect for humping up the Elk mountain.
The only load I've shot is 68 grns. of IMR-4320 and the 270 grn. Hornady SP.
My final load will be with the 260 grn. Accubond and some more amount of some kind of powder.

I carry with me and shoot all the time a 416 taylor built up like yours longer barrel I shoot 70 gn of 4320 powder in it with a 120 cci and 300 gn bulllet [approx 2,521 fps] --the old ken waters load --I shoot it with a 300 and 400 grain barnes or the nosler 400--- with 70 gn of 4320 it is suprizingly lite to shoot

Stradling ; Welcome to the forums .... 70 gr 4320 is my go to 416 Taylor load .. With 400 gr RN SP bullets it sped out of my short barreled taylors @ 2250 fps give or take 20 fps ...... VERY EASY TO SHOOT LOAD . Pretty easy on deer , and will clobber a bear up close ... Muskeg Man shoots the 375/338 and he likes it alot ....

ya know I just thought of sumpin i was in the top end of the copper river valley one time had holed up at glen allen and had to make a run down the road a bit to get somthing to mix up with the 500 year old glacier ice I had packed out of a canyon up country with some forsite. jezz uss just thinkin about it makes me wanta go right back what a hell of a nice country you got up there

Shot my first griz with a Remington 700 rebarreled to 375/338. Carried the rifle for years as it was my go to rifle. Loved the round. I do remember averaging 2575 fps with the old style 300 grain Noslers.

But as much as I enjoyed the round it makes no sense today with the 375 Ruger on the market.

Forgive me for dragging this thread out of the dusty archives, but I have a quick question on the .375-338.

From case drawings found online, the neck length of the H&H and Ruger are 0.352 and 0.305 inches respectively. If I'm doing the trig correctly, the neck length on the .375-338 wildcat ought to be about 0.371 inches.

Can one of you guys with a .375-338 tell me if that's right, that the wildcat has a longer neck than the H&H?

thanks

Hey Tater, hows it going . I don,t have a round in hand . Just built my loading bench yesterday , but that sounds right .

The neck length on mine come out at .351, fireformed, and using RCBS dies. The expansion of the neck will reduce the length.

Phil

is yours a375/338 or a375 Taylor ?