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help sizing .30-378wby brass

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Unread 09-05-2007, 01:22 PM
Junior Member
Join Date: Apr 2004
Posts: 13
help sizing .30-378wby brass

I'm fairly new to reloading and I have some questions about sizing brass. I know the .30-378 is considered a "free-bore" caliber. I've been reading alot about using bushing style dies and I want to try it out. My question is: Does this caliber work better to neck size or use a full length sizer? Do I need to bump the shoulder back? I got a new bbl for my gun and I now want to make sure I feed it the highest quality reloads I can produce. What do you guys think?
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Unread 09-05-2007, 01:30 PM
Silver Member
Join Date: Mar 2007
Posts: 430
If you are hunting, you want the feed reliability afforded by full-length sizing.
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Unread 09-05-2007, 02:11 PM
Platinum Member
Join Date: Nov 2005
Location: Texas
Posts: 1,845
I full length resize everything including my competition fodder. I have sized many a 30-378 and in my experience they shot outstanding in the factory rifle while being full length resized.
The Truth Is Not Always Good For Business!!
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Unread 09-05-2007, 02:36 PM
Silver Member
Join Date: Jan 2005
Posts: 262
Agree with the others. For hunting you want to set your dies for a FL size. You might as well do your load developement the same way you are going to hunt. Most benchresters are FL sizing nowadays because they don't want feeding problems at the bench. (although they have special dies that do a minimal resize all the way around). In a normal hunting rifle with a well set up fl die you will get excellent accuracy....probably much better that the average guy can shoot in the field.
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Unread 09-05-2007, 03:38 PM
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Join Date: Dec 2002
Location: mathias wv
Posts: 987
here's what I do, in your case run an over sized expander ball into one case, say an 8mm or 338, lube it well!
then start with your resizer screwed way up and resize, trying it in the rifle as you go, when you can close the bolt with just a lil resistance, screw the die in 1/8th to 1/4 turn and lock it down.
your cases are now sized to perfectly fit your chamber. then you can do your normal case prep and load.
Born to Hunt, Forced to Work!
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Unread 09-06-2007, 09:00 PM
Silver Member
Join Date: Jan 2005
Posts: 262
Not trying to knit-pick but don't go a 1/4 turn...that would probably be about .012" and that's a good chunk of headspace. Keep it to 1/8 turn using the method above. BETTER YET----get a stoney point (now hornady bought them out) headspace bushing kit for all your calibers. Probably the best $35 you'll ever spend if you do any amount of reloading. I could load without it but I use it all the time now that I have it.
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Unread 09-06-2007, 11:35 PM
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Join Date: Jul 2001
Location: San Antonio, Texas
Posts: 244
Not trying to knit pick but 7/8"x14 thread (which most dies are) has 14 threads per inch, which means the one full turn moves it .0714", which 1/4 of that is .0178". That's almost .018". Now 1/8 of a turn is .0089" which is all but .009".

I would say that somewhere around 1/16th of a turn or slightly less (closer to .003") would be more appropriate. Just my opinion!

But, then again. If your not going to be pushing the pressure limit, then there's no real big reason to FL size unless it's entirely necessary. Aside from being less work, it will make your brass last alot longer.

I've pushed full power loads to 5 loadings, never resizing, before the primer pockets gave out. And when i say never resizing, I mean none at all. Just fire, decap, recap, drop powder charge, seat bullet, and fire again. But i always check every single loaded round in the chamber just to make sure there is no problem. At least for that rifle anyway.
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