Anyone have a .375/.338Lapau?
what about a 350PP woodleigh@2450? SD=.354!
You could probably run it faster, But would like to keep pressures down to around 49,000(375HH mark)but with the heavier,higher Sd at a very acceptable 2450fps. Just sounds like a great combination.
Then again a 9.3x64 320pp woodleigh@2450 (sd.341) seems like a sweet and effective combination and probably much nicer to shoot!

What vel.are you running the 350gn out of your .375H&H?

.

Woodjack,
I've got a .375/.338 Lapua.
... Dan Lilja N0. 6 stainless fluted barrel 26" long, 12" twist.
... CZ 550 Magnum action (Holds 4 down in the box). A fifth round can be chambered if needed.
... ArmTec synthetic stock (an RSA knock-off of Bell&Carlson) with aluminum bedding built in.
... Talley QD rings x2 sets.
... Two Leupold scopes, both 2.5X-8x, one with mildot reticle, one with standard duplex.
... No sights on barrel.
... Brownells front sling stud plate barrel channel bedded and sticking out at the tip of the forend.

This is a cartridge with the same capacity as Saeed's .375/404.

My rifle is throated like the NEW .375 Weatherby (0.3700" length freebore excluding leade of course), with a Dave Manson neck and throat reamer, and a Dave Kiff .338 Lapua Magnum reamer with live pilot.

95 grains of H4831SC gives one-hole accuracy and about 2750 fps with the Sierra GameKing 300 grainer. Pressures are probably about 50 KPSI and will never be a problem, according to my SWAG.

That is as far as I have gotten with load development. I just got my inside-neck reamer to do away with the "dreaded doughnut" caused by necking up .338 Lapua Magnum brass to .375.

I can now proceed to use the longer monometal bullets seated past the doughnut.

I do not forsee ever wanting to use a bullet heavier than 300 grains, and that is probably the only bullet weight I care to use in this rifle.

300 grain bullets of various construction and BC for different jobs will allow me to "Keep It Simple Stupid."

This is something I have learned from Saeed.

BTW, when you neck up the .338 Lapua Magnum to .458, there is no dreaded doughnut.

Getting into the former shoulder area of the .338 with a .375 expander does not thin it out enough to "vanish" the neck shoulder juncture of the .338 Lapua completely. Necking up to .458 irons it out completely and does not thin the neck much: it shortens as it necks up, from 2.720" to about 2.666".

The .375 Lapua is about 2.700" when necked up from .338 Lapua Magnum brass that starts off at 2.720".

I can load the bullets out to 3.750" or even 3.800" COL in the CZ box and slightly exceed the .375/404 Saeed and .375 RUM capacity with my shorter and fatter .375 Lapua.

BTW, Woodjack,
The max pressure average allowable for the .375 H&H is 62,000 psi or thereabouts. Some will get the CUP values (lower numbers) mixed up with the more modern PSI vakues, kapeesh?

The .375 H&H is a "high pressure" cartridge and is around 60 KPSI with most hunting loads.

How else could such a skinny little cartridge as the .375 H&H do so much with so little???

I field tested the 350 gr. 375 and the 450 gr. 416 in Africa on Buffalo several years running, and I never had one come apart and challange anyone that says they do...I got two holes in every buffalo I shot with them..I have shot about a dozen bulls with them to date...Geoff shot a lot, and I mean a lot of Aussie buff with them before they hit the market...

I can't imagine a better bullet. I did find the PP to be tougher by a small margine than the RN for what its worth.

I read one post where someone claimed one of them came apart, but I took that with a grain of salt...Its pretty darn hard to make any bonded core bullet come apart at the velocity it is intended to be shot at....

I think you have to have a 416 Rem size case for them as they are too long for the short magnum cases and would take up too much powder space.

A faux pas by me above. Saeed is using a .416 Rigby length Dakota action, I forgot. Of course he must load them out to 3.75" to 3.80" COL given the length of the nose on the Walterhog, so there is no way I can get greater capacity than his .375/404 Saeed, with my .375 Lapua. In fact I have to load my 2.700" brass to 3.750" COL with bullet seated long in order to equal his case capacity.

BTW, the inside neck reaming worked great to get rid of the "dreaded doughnut" in my .338 Lapua Magnum brass by Lapua necked up to .375.

My homemade dies are assembled from five component sets or tools:
1. .338 Lapua, modified
2. .378 Weatherby, modified
3. universal depriming
4. .30 to .375 neck expanding
5. Forster inside neck reamer .375 caliber

This makes beautifully concentric and functional ammo with bullets seated with no crimp.

I need to get custom dies made now by Redding, and a Lee Factory Crimp Die.

Then I just engrave a ".3" and a "5/" on either side of the upside-down "L" in the Lapua shield-logo and I have properly headstamped brass that says:

".375/.338 Lapua Magnum"

Goal:

.375/300gr bullets at 2740 fps and 50KPSI

... or at least 10,000 psi less than the max loads in the .375 H&H, .375 Wby, and .375 RUM.

This will allow me, at the end of this not-so-simple process, to ultimately do as Saeed does:

"Keep It Simple Stupid."

Now, in addition to being stupid, I can keep it simple: One bullet weight for everything, big or small, hard or soft, near or far, hot or cold.

.

Alf,
I shot them in the .375 at 2575 FPS and in the 416 at 2420, all 10 shot averages on the chronograph...

I suspect your correct that driving them faster would be a mistake. Any bullet should be driven at the MV it was designed for....

IMO, all ultra mags from the Wby on up should only be shot with monolithic bullets....as bullet failure has been their nemousis for eons!

quote:

Originally posted by RIP:

My homemade dies are assembled from five ... make that six ... component sets or tools:
1. .338 Lapua, modified
2. .378 Weatherby, modified
3. universal depriming
4. .30 to .375 neck expanding
5. Forster inside neck reamer .375 caliber

6. A 9 mm Luger seater die: the beveled entrance of the pistol die base allows a nice crimp on the mouth of the .375 Lapua with Barnes TSX or GSC FN/HV, or Bridger solids, or North Fork softs and solids and Cup Points ... pending arrival of custom dies, I can already load and shoot anything.

This stupidity will get simpler as I go along.

Id like to try the 350 in my 378 wby. RIP long time no chat.... why wouldnt you just stick to your 378 at that COL instead of the 378 LAP?

Ray,

What is your powder of choice with 350gr Woodleigh's out of your 375H&H? 2575 FPS out of your 26 inch tube seems to be fast. Could 2450 FPS be achieved in a 24 inch barrel? What do you think of H4350 with such bullet? Thanks again Ray,

Enigma

P.S. I hope you don't mind me calling you Ray.

quote:

Originally posted by smallfry:
Id like to try the 350 in my 378 wby. RIP long time no chat.... why wouldnt you just stick to your 378 at that COL instead of the 378 LAP?

smallfry,
I am just being "simply stupid" I reckon. However...

You get 4 down in the .375 Lapua, with the more tapered and beltless case, while my .378 Wby gets only 3 down, also on a CZ 550 Magnum action.

.375 Lapua feeds slicker too.

.375 Lapua is also zero-rebate on the rim, as opposed to the .378 Wby where the rim is smaller than its belt.

And, I don't want anymore than about 5000 ft-lbs at the muzzle, so the .375 Lapua is easier for 100% density loads with lighter recoil.

I think the .375 Lapua is just prettier with the shorter fat case and the bullet sticking out more than an inch.

Besides, how many other kids on the block have a 9.5mm Tornado aka .375/.338 Lapua Magnum?