I am having trouble locating loading data
for a .375 Ackley Imp. Any help would be appreciated!
Thank You!!

[This message has been edited by tsturm (edited 11-10-2001).]

tsturm,

I have a little data here in a book called "Wildcat cartridges", this book was published some time ago so you might double check these loads if you can.

270 gr Hornady
91-93grs of IMR4350
92-94grs of n-204
94-97 gr n-205

270 gr Nosler
93-96 gr n-205

300 gr Hornady
89-91 gr IMR 4350
91-94 gr n-204
94-97 gr n-205

300 gr Nosler
91-94 gr n-205

I hope this helps
Sooner

Thanks SOONER!!!! this will get me going!

tsturm: A note of caution, the IMR 4350 load of 90 to 93 grains for the Hornady 270gr bullet is "way up there". Clair Reese informed me in the Dec '85 issue of Shooting Times that my load of 88gr with the 270 Hornady was, quote, "above the gray zone". Perhaps start around 84gr and work up. The 270 Hornady gave great accuracy.

DANGER!!!!!!! WARNING!!!!!!!!!!!!!!

I just looked up the load I use for the 270 Hornady in my .375 Ackley Improved. It's 85.0 gr of IMR 4350 with the Fed. 215 primer.

Don't use those loads listed above. I hope I am not too late!!

I just looked in one book as I have to run but the Barnes Manual for the .375 Weatherby with the 270 gr bullet lists 86 gr of H4350 as max! Now this load includes X bullets I suppose that produce higher pressures but I think the .375 Weatherby was free bored.

Don't go by internet loads. It's worse than face to face at the mall. No flame intended. I make posting errors all the time and I have not found the edit feature here yet if there is one!!!!

Don.

Ok I just double checked the data and I did copy it correct. The 375 Improved shows to have more case capacity than the 375 Weatherby, of which my A2 manual lists 89 gr IMR 4350 being max load with 270 gr bullets. I don't know the exact case capacity but in the text accompanying this data it states the performance of the .375 improved will fall in between the 375 weat. and the 378 Weat. I would recommend taking these guys' advice and back off a bit before doing much shooting. I don't know when the article was written but it states that they declared absolute max when they had .001 expansion on the case head. Based on that statement I don't think they had any real accurate pressure testing equipment. By all means listen to these guys and check any loads you are given.

Sooner

There is no way that the "performance" of the .375 Ackley Improved "falls between" the .375 Weatherby and the .378 Weatherby!

The max load, from memory, for the 270 gr bullet in the .378 Weatherby is 115 gr of H4831! I used the min. load in mine. That was 105 grs.

The Weatherby's are free bored and my Douglas chamber is not. I have no idea what the guy in Alaska has. At least it's cold there now.

Using Quickload this is what I came up with.
375-ACK/IMP 89GRS IMR-4350=2874/FPS 61263-PSI
375-WEATH 86GRS IMR-4350=2864/FPS 62405-PSI
This was with a 24" barrel and a 270gr Hornady SP. I don't have either of these calibers so I can't recommend any loads.
Wayne.

The hunting load for my 24" Douglas bbl. was 92g H4350 with the 270g Hornady at 2887 fps. Rifle barrels/chambers vary greatly and safe pressure in one might lock the action in another. You cannot make a blanket statement that a load is too hot without starting load and working up in the rifle you are intending to shoot.

I found that book "Wildcat Cartridges" and indeed the load is 91-93 gr of IMR 4350 for the 270 Hornady.

Now I need to find the burning rate of IMR 4350 vrs H4350.

First I am going hunting.

Gentlemen,
IMR-4350 is pretty quick for that cartridge.

I have no data on it but as we compare it to the .375 Weath. in A-Square manual:
80 gr 2546fps @50,200 cup
85 gr 2641fps @52,100 cup
89 gr 2709fps @60,100 cup OVER ~69,590psi

Slower powders are IMR-4831: Max listed loads
88 gr 2730fps @54,400 cup

RL-19
92 gr 2743fps @55,100 cup

RL-22
91.5 gr 2694fps @51,900cup
You can see by going to slower powders you can improve the velocity while lowering pressure.
For this cartridge the CUP can be multplied by 1.16 for PSI.

The burning rate for IMR-4350 vs H-4350 is too close to call. They are listed #94 and 95 on the burning rate charts.

I do not know why Art Alphin didn't seem to like H-4831 in many of the big bore cartridges. It has a good burning rate between the RL-19 and 22. It might be worth taking the time to look at that powder.

While the .375 Weath is smaller than Ackleys it isn't by much. I too have that thick wildcat cartridge book and there is a great deal of blue sky estimation going on.
I hope these values help you.

[This message has been edited by Roger Rothschild (edited 11-16-2001).]

tsturn;

A, so to speak, "rule of thumb" with most any Ackley improved chambering is to start with the listed MAX load for the non improved chambering, and work up from there! Works out pretty well. Just make sure to use good sense with your load development. Each rifle is a world of it's own!

Don Martin;

I think it was you who couldn't find the edit function? Go to the little icons just above the message and point at I think the next to last on the right and click on it. A little message will pop up when you have your arrow on the icon telling what it means. One is edit!

BP

------------------
Speak softly, but carry a big stick!

[This message has been edited by Burnt Powder (edited 11-16-2001).]

Yes I finally found the edit function.

Going to shoot the 180 Speer today out of a M-99 .358 Win. The load is 42.5 gr of IMR 4198. This is for Whitetails in the forest.

I know it will kill them. This is just for conversation. The bear season is over now.

[This message has been edited by Don Martin29 (edited 11-16-2001).]

Thank's For All the help!!!

Here we go