what to build a 375 ackley or 375 RUM

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Bigbear

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I am building a 375 I am stuck between the ackley and the ultra mag. Does anyone have reloading experience with either. I am going with a 26" barrel and I want a 260gr accubond at 3000fps or better. any good info would be appreciated.
 
I'm loading that exact thing in my 375 RUM with the factory 26" barrel. The load is with H4350 over a Winchester Magnum primer. I think I'm at 92 grains but will confirm tonight once I can get to my load book. The issue I have is that I would like not to have to seat the bullet so deep and get closer to the lands but the magwell restricts length as does the recoil bump in the magwell. Whats the point of a rifle like this in a single shot??? I would love to get the Tubbs lengthend mag box but could potentially start cycling issues and have to invest $$$ in opening up the stock and the adjust the action for it. My loads according to the Hodgdons is right at the door step of 3000 FPS and will be able to crony soon to verify
 
I rechambered (rather D. Henry in Bentley Alberta -- who did a superb job!) a .375 HH in sako fiberclass (24 inch bbl) to an .375 ackley improved. The action was bedded as well. Shoots 300 gr Sierra to an honest 2900 ft/sec with little fuss. I load it down 1 grain of I-4350 to ensure pressures are good and safe in hot weather. Shoots at about 2850 and moa to boot. One of my favorite rifles I own. It has a gunnare muzzle brake on it and I do not even feel the shot (especially in the field. The 300 gr carries a lot of down range energy and with relatively low amount sof drop. It is sighted in at 250 yds and it is happy. A good thing id that it will shoot a 300 gr .375 HH to almost same poa, just a bit lower is all. Perfect for Africa.

I have not bothered with the 270 gr or 260 gr as the 300 will do the job.
 
I used a 375 ultra for awhile should never have sold it.100grs of RL 19 gave me just over 3000fps with the 270Xbullets.
 
Full powered loads from my 20" barrel are about 2900, but I loaded Ballistic-Tips to 2600 for better terminal performance. The Accubonds may not have similar issues, although I haven't shot enough of them to form an opinion. The BT's at 2600 were flat shooting out to 300, very accurate, and this load made them easy to shoot.
 
With a 26" bbl you can take advantage of a really big case, and that to me means the .375 RUM. If you really need top performance, then the RUM is the hands-down winner over the AI, which is really no different than the .375 Wby in terms of capacity and performance. Though if you're going to go with a big case, then shooting anything except the biggest bullets (300 grn for the .375 bore) nets you a pretty small advantage.

Note that I shoot a boring old .375 H&H and get 2800-2850 fps from the 260 grn accubond, from a 22" bbl in a very handy rifle. At 2800 that bullet drops 4.0" at 300 yards. If it were going 3000 fps like your proposed load, it would drop 3.5". If you loaded it very hot you might be able to get it going 3200 fps, which brings the drop to 3.0" at the same range... just something to think about before you shell out the cash for RUM brass, and all that extra powder, and cart a 26" bbl around in the brush...
 
I load my Rem 700 LSS to 3020fps with the 260gr Accubonds..

I can't remember the load right now and I'm shutting down the computer for the night.... Tired....
 
I owned a 375 Wby in a BRNO ZKK602 quite a few years. Also loaded for, and shot one in a Rem 700. Both rifles would get 2800 fps with 300 gr and 3000 with 270 gr bullets.

To clarify, they were both 375 Wby, not 378. Brass is very easy to either buy or form, accuracy great, and case life excellent at those velocities. I really should get another one. :)

Rembo has the reamer. You might want to contact him.

Ted
 
I have a 375 Wby built on a P14, great caliber. A true improvement over the original. 2800 fps with 300 gr bullets is no problem. Back when loading data was very scarce, I used an article from Handloader to drive 300 gr bullets to 2900 fps, although I've sinced backed off on those loads. FWIW - dan
 
If at some day down the road you decide to sell this rifle it will be far easier to sell a standard production cartridge than it would be to sell a wildcat....
 
and can digest 375 H&H ammo if necessary.

The 378 weatherby is also a producton cartridge, and it ups the fun factor by an order of magnitude
 
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