Home Forums Reloading Big Game Rifles 300 WSM sizing question

Two rifles, one resizing die.

Resized fired brass from the Sako & the Borden will not interchange in either rifle. Resized Sako brass gets stuck in the Borden chamber even though they were run through the same die.

Never run into this before. Both rifles do have very tight chambers.

Opinions?

Turn die down just a touch.

Turn die down to cam over center. The WSM's are known for resizing difficulties.

Yep... They are finicky bastids and require proper FL sizing..

I've been camming over on my sizing dies since I started reloading.

""Fully size"" every case and turn the die down about a quarter turn.

Like what? Never heard of this.

..........8 years ago when first beginning to reload for my 300 WSM I partially sized the first few casings. They wouldn't feed.

Ever since, I have fully sized every case with no feeding problems. Very smooth actually.

More feeding issues will occur imo with this cartridge when only partial sizings are done.

How much more fully sized can you get than camming over?

......None.....So you will have to either keep the brass separated for each rifle,try a new die, or have your tight chambers reamed out a little.....

If me, I'd just keep the brass labeled and separated for each rifle.

I have a .300 WSM and from the beginning had problems in sizing enough to allow the cases to chamber. Finally I started setting up my die to cam over. Have never ever had to employ the amount of cam over required by the .300 WSM's in any other cartridge. Once I discovered the proper die setting chambering, however, became easy.

Jim

Have had the 270,7mm,and 300 WSM. They were all the same and required camming over. Otherwise they would not chamber.

Of course there were those cases fired in egged chambers in early rifles and nothing helped them.

The brass is pretty tough stuff.

That's the nice thing about the 300 WSM brass that I've noticed Bob. It lasts forever. Well maybe not forever, but for a very long time nonetheless...

bsa you can't kill the stuff it seems.

In my 300 WSM have noticed higher velocity on cases that I have used several times. Case length was correct and anealing brass seemed to help.

Rem brass in my 270 WSM seems soft and I get case head marks at normal velocity?

kk: Have no idea why the higher velocity with used brass.How much higher? Increased neck tension maybe because the brass is work hardened? Just guessing....

Remington brass has always had a reputation for being softer than WW,and also heavier (although I don't know if that is true anymore). It might also have a bit less internal capacity than WW....little things adding up could mean higher pressures than the same charges in WW or other brass types. That you are seeing case marks (I assume you mean the brass is flowing back into the ejector slot/hole?) is an indication the loads are over the top in that brass.

Might have to throttle back charges in Rem brass, even if it means less velocity.

The 300 wsm's I played with responded VERY well to being worked w/a shaved shellholder. Take .010" off the top so you can lower the die a little more. I also found that by pushing back shoulders at least .003" helped bolt lift getting rid of fired rounds. Otherwise lift was pretty heavy and not smooth....seems that big shoulder area when filling the chamber caused that bolt lift.

Stolen from another thread, but worth the repeat Resizing Case Dimensions

Very interesting piece about bolt lift.

That wasnt a "good" read.....it was an "excellent" read. I've always broke out the body die at the slightest hint of bolt tension in closing. Yet so many reloaders seem to like it that way. I found his comment on changing barrel harmonics interesting as I've seen points of impact change slightly w/cases under tension when experinenting a while back.
The nice thing about having lots of body dies is you can actually use them on loaded ammo if you feel the need to bump later.
Thanks for posting that!

kraky/16: Good info! Thanks!