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Old October 19, 1999, 11:28 AM   #1
Senior Member
Join Date: November 3, 1998
Location: CA
Posts: 465
Here's an email I got from a friend with 300 WinMag reloading problems. I'm out of my element here, so would appreciate help from someone. Thanks.


Hey do you find web sites on rifle stuff too? I suppose you do. I need
your help here. As I am loading some hunting rounds for the elk hunt
next year I am finding I need some input from others. Can you check or
ask on a site about reloading 300 Win. Mag stuff. I am finding that even
after sizing and trimming brass that It is very hard to close and open
the bolt on most brass. I have looked carefully at them with a
magnifying glass and can't really see anything. I am wondering if my
shell holder, #4 RCBS, is machined wrong and does not give me enough
"push" or stroke into the die that the case does not go far enough into
the die to reset the shoulder to it's correct depth? I have measured all
points I can think of to see if I can find a problem. I can't. Maybe
the die is cut too deep and won't push the shoulder back enough. Also,
the neck sizing doesn't go all the way down to the shoulder as I would
expect it to.

Maybe RCBS would let me send my dies and shell holder and some sample
brass back to them for a look-see.

Help me if you can. I have always had this problem with the combo I am
dealing with. You may recall it was hard to close the bolt on the rounds
we fired last time in the desert.

Anyway, see what you think and lets talk."

Regards - AZFred

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Old October 19, 1999, 10:22 PM   #2
Long Path
Senior Member
Join Date: May 31, 1999
Location: N. Texas
Posts: 5,896
Hmmm... Try these guys:

Sierra Bullets Hotline:
For Customer Service call: 1(800) 223-8799 or send us e-mail
Please include phone number with your technical question email!!


They've never let me down, and they staff that line from 9A to 9P Central. They honestly don't care if your question regards a Sierra product. I guess this concept works, because it sure has inspired some major-duty customer-loyalty in me!

I noticed that he says he's neck-sizing. 2 questions: <UL TYPE=SQUARE>
[1]Was the brass previously fired in that rifle's chamber?

[2]Is he aware that neck-sized-only cases are tighter-chambering than full-length-sized cases? If the bolt will close, often the answer is to simply chamber each and every loaded cartridge in the rifle before the hunt, and they are "sized" perfectly.</UL>

Just some thoughts.

BTW, my .300 Win Mag load came from a guy named Paul at the Sierra Tech line, and pushes one of their 180g BTSP at an honest 3100+ fps (verified on Oehler chrono), and gives me .75 MOA. What more could I ask for? Powder is RL 22, but I've had good results with RL 19 and 4350 works well for 165g or less.

Will you, too, be one who stands in the gap?


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Old October 20, 1999, 10:28 AM   #3
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Join Date: November 3, 1998
Location: CA
Posts: 465

Thanks for that info. I will pass it along to my friend.

Regards - AZFred

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Old October 22, 1999, 09:31 AM   #4
Join Date: October 14, 1999
Location: San Diego, CA. USA
Posts: 51
Are you sure you are not seating the bullet out too far? Check the bullet to see if it is contacting the rifling...hope it helps. Steve
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