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Thread: Loads for .375 Whelen Ackley Improved

  1. #1
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    Default Loads for .375 Whelen Ackley Improved

    Had a custom rifle built in .375 Whelen AI with 40 degree shoulder. Scoured all the reloading manuals and the web for both fireforming and working loads. Not much available.

    Anyone have experience working up loads for this cartridge?

    Appreciate hearing your experience. Thanks.

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    You can use the loads made up for the .375 Weatherby on Hodgdon's website. If you have the opportunity, you can find loads in Ackley's book "Handbook For Shooters and Reloaders".
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    Default Ackley

    Ackley's book is the ticket , but you have to be careful , some of the loads listed are HOT .

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    Member Timber Smith's Avatar
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    I loaded these for a pardner's custom .375 Whelen Improved or as he liked to call it his "poor man's magnum". Here are two loads:

    270GR Hornady SP
    58 grs IMR 4064
    Remington 9 1/2 large rifle primer
    Remington Brass (formed from necked up 35 Whelen Remington bulk cases, never tried any necked up 30-06 cases)
    Average Velocity 2420 fps

    300GR Hornady BTSP
    54grs IMR 4064
    Remington 9 1/2 large rifle primer
    Remington Brass
    Average Velocity 2185 fps

    These loads were fairly accurate, consistently turned in 1 moa 3-shot groups. I believe accuracy could have been improved with a little more tweaking but load development was effectively terminated when the shooter's desired level of accuracy was achieved. This rifle is built on a trued Remington action, 24" Shilen select match SS 1-12" twist barrel, McMillan mountain rifle stock.

    Anyways, ain't much, but, can get you started. I am suspect myself of any internet loadings. These are from my load data, I loaded these to help a friend get started in shooting a new firestick. Since then, pardner is handloading for himself. I can check with him in the next few days to see if he has any new developments with this Ackley. I'm an Ackleyite myself, anymore I pretty much just work with 280AI.


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    Quote Originally Posted by Nitroman View Post
    You can use the loads made up for the .375 Weatherby on Hodgdon's website. If you have the opportunity, you can find loads in Ackley's book "Handbook For Shooters and Reloaders".

    I don't think the 375 Wby is close enough to use that load date. The 375 Wby is the improved H&H case, the 375 Whelen is on the '06 case.

    I have a bunch of loads for the 375 Whelen AI. I have one of these have loaded for it a bit.

    P.O.'s book has some good loads but it has some that were pretty warm. I have some with modern powders, RL-15, H4895, etc and will dig them out tomorrow.
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    Quote Originally Posted by Nitroman View Post
    You can use the loads made up for the .375 Weatherby on Hodgdon's website. If you have the opportunity, you can find loads in Ackley's book "Handbook For Shooters and Reloaders".

    This comment could really get someone in trouble. The 375 Wby is bascially an improved 375 H&H and is built on the longer belted case while the 375 Whelen is built on the 06 case.
    For example, the 375 Wby will probably use 15-20 grains more of RL 15 than the 375 Whelen would.
    Not so much a problem for slower burning powders but if the person asking for suggestions used a faster burning choice it could be a huge mistake.
    Tennessee

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    Chessie,


    I don't think I want to leave load data posted for any length of time, if you're interested in load data contact me directly.

    Redding makes custom dies for this caliber and they are on the shelf for about $125, ready for delivery, you won't have to wait 3 months.

    I wouldn't mind taking another run at loading this one and might work up some more loads with different powders this summer.
    Last edited by Murphy; 02-10-2008 at 10:10. Reason: creepy crawly things
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    Murphy-

    Did you ever work up any more loads for this caliber? I just picked a rifle up in this caliber yesterday and will be starting to load for it shortly. A set of RCBS dies and some ammo / cases came with it so I'm ready to go.

    Thanks!

    Quote Originally Posted by Murphy View Post
    Chessie,

    I don't think I want to leave load data posted for any length of time, if you're interested in load data contact me directly.

    Redding makes custom dies for this caliber and they are on the shelf for about $125, ready for delivery, you won't have to wait 3 months.

    I wouldn't mind taking another run at loading this one and might work up some more loads with different powders this summer.
    Living the urban lifestyle so I can pay my way and for my family's needs, and support my country. And you?
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  9. #9

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    Not Murphy but.. for a base reference you can start with 35 Whelen loads for similar weight bullets -start low and work up. 375 Whelen AI with larger bore and larger case will reduce pressure some over 35 Whelen. I have tried IMR4064 and RE15. RE15 seems better in my rifle using 260gr partition.

    Eric

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    Varget should be an excellent powder in 375 AI. With 260 gr start at 54 gr and work up.

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    http://www.amazon.com/Bore-Rifles-Ca.../dp/1879356007

    For those of us with bigger bores, this is a great reference book and fun to read too.

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