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338 Imperial loads???

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  #22  
Unread 05-15-2009, 01:06 PM
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Join Date: Oct 2005
Location: River City USA, East of the Mississippi
Posts: 286
Re: 338 Imperial loads???

A big thanks to Phorwath for the 338 Imperial data that Slayman shared with me. I just got the gun together but have reservations about going to the range with it as yet. I'm going through therapy with my neck injury and a bit apprehensive about taking any kind of recoil, even though I have a Vias muzzle brake on it. Just afraid to jar it at this time.

I have a large batch of H5010 powder I want to try. It works great with the heavy bullets in my 300 RUM. As things develop I will post them to share with other 338 Imperial shooters. Also working on the 375 Canadian Magnum. When it's together I will share my findings with it also.

Thanks much for the data to get me started and on the road to enjoying my wildcats.

Olcrip
Keep yore powder dry!
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Olcrip
Nuclear Grade U.B.C. Ret.
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  •   #23  
    Unread 05-15-2009, 01:20 PM
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    Join Date: Apr 2005
    Location: Alaska
    Posts: 4,695
    Re: 338 Imperial loads???

    Hey guys, glad to see you're able to use some data I had collected. I'm still around and kicking. I just wanted to mention that my loads were worked up in RWS 404 Jeffery brass and that the RWS brass can take some pressures that will destroy Remington brass the first time around, so be a bit cautious approaching the maximum loads I listed. I had some loads I considered too hot even with my RWS brass. I remember shooting one brown bear with the 225 grain Trophy Bonded Bear Claw load and I had to hit the bolt handle up with the palm of my hand in order to work the action. I've moderated the intensity of my loads over the years as the need for speed has diminished - but only a tad bit .

    Best wishes in your load workups and it would be great if you'd post back with any killer loads that you might develop. The Imperial was/is a great cartridge. I had my rifle worked over by Kirby Allen about two years ago and it's now a 338 Edge, but basically the same as the Imperial. Glad to see you're keeping the Imperial round on the active duty roster!!!
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      #24  
    Unread 05-15-2009, 10:40 PM
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    Join Date: Aug 2008
    Location: Helena, Mt
    Posts: 61
    Re: 338 Imperial loads???

    Paul, thanks again for the data. I've been useing RWS brass but will be worrking on loads with Norma and Hornady also. In both my 338 and 360 Imperials. I'll keep ya posted
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      #25  
    Unread 09-17-2011, 03:15 PM
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    Join Date: Aug 2008
    Location: Helena, Mt
    Posts: 61
    Re: 338 Imperial loads???

    Tryed some IMR 7828SSC 95.5gr under a 225 accubond seated 0.030 off the rifleing in Hornady brass yesterday. Got 3220fps but a 2" group. going to mess with the seating deapth an see if that helps the group. sure happy with the speed.
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      #26  
    Unread 09-17-2011, 04:25 PM
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    Join Date: Apr 2005
    Location: Alaska
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    Re: 338 Imperial loads???

    Good to hear further from you. Yes, please do share your efforts and results.
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      #27  
    Unread 09-18-2011, 03:32 PM
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    Join Date: Aug 2011
    Location: martinsdale,montana
    Posts: 143
    Re: 338 Imperial loads???

    you might want to get ahold of randy selby a randys custom rifles in wapiti wy. he has built alot of these and more on the imp case and 404 case
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      #28  
    Unread 09-22-2011, 06:32 PM
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    Join Date: Apr 2008
    Posts: 33
    Re: 338 Imperial loads???

    WSlayman,

    I happen to be another 338 Imperial shooter. I wish I had run into your post a few years ago. I too built one before the Ultra Mags existed.

    My hunting load has been 97 grains of RL-25 with a Sierra 250 Game King. This is using Norma 404 cases. Velocity is 3100-3125 out of a 28" barrel. I am experimenting with Remington 375 Ultra cases. Just size, trim to length and they work beautifully. You could hunt with that load before fireforming if you wanted. According to my notes, when measuring internal case volume, fired cases using Remington brass have about 3.0- 3.5 grains more capacity than those formed from Norma cases. The Imperial and Edge are for all intents and purposes identical. I like using the Remington brass because we eliminate the need to trim case rims to .532." Maybe not everyone does that, but I always did.

    I started initially using Imperial brass. I still have some new stuff. It is quite soft though. Much prefer the Norma or Remington. Haven't tried 225 or 250 Accubonds yet but I will. One thing I've noticed about Accubonds is that some rifles prefer them seated farther from the lands. My 7mm STW and 300 Ultra both shoot better with the Accubonds seated deeper in the case.

    Best wishes and good luck.
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