When I f.l. size and load a round I have a slightly stiff bolt lift and have to hit the bolt handle with my hand to get the round out.
When I mike a resized case it measures .553 my 7 ultr mag measures .550 after f.l. resize.
So I took the deprime rod out of my 7 ultra and resized 3 load rounds in it and they chambered fine in the 300 wsm. Do you think my die is to oversized? thanks

Is your shell holder bumping up against the die fairly hard? If not, do that.
Looks like ammo can be .555, so you have a tight chamber, not a loose die. Your die brings it below max SAAMI allowance.
Polish your chamber. And by polish, I mean, with some aggressive grit paper. Or, try another make of die.
Note; there is so much overlap between max ammo and min chambers that it is a miracle that anyone can make reloading dies that work as well as they do.

dpcd thanks for responding, yes I,m putting the die down on the shell holder till the handle has to cam over a little. When I ran them into my 7 ultra die they chambered fine. thanks

When I first started reloading for my 300WSM the cases wouldn't even chamber in my rifle. I had to grind a little off the skirt of the die in order to get the case further into the sizing die. Worked like new money!

That is fine if it is a case of too little chamber headspace (too long head to shoulder brass), but the OP thinks/says, it is a tight base. I have had to lathe turn off some of FL dies too, to get shorter headspace. Cases. But if it really is a base diameter thing only , then you don't want to do that.

Do the fired .300 WSM cases re-enter the chamber readily before you resize them? If so, then your resizing die is bulging them some place. This is usually because the die is too small, not too large, in the forward body and pushes the shoulder forward slightly as the body is swaged down (the brass has to go somewhere). If the shoulder is pushed forward in the sizing process, then the die must push the shoulder back in order for the case to rechamber.

You can use your current die by either facing a little metal off of either the shellholder or the bottom of the die to allow the case to insert further into the die, but the bottom line is that your die is incompatible with your chamber, so you would probably be better off buying a new die.

Most likely it is your chamber that is unusually large rather than your die being unusually small. This is rather common in that the rifle manufacturers start with somewhat oversized chambering reamers since as the reamers wear the chambers get progressively smaller, so the more oversized the reamer the more chambers they can get out of it before it has to be discarded. If an oversized chamber is where the incompatibility lies, then you may find other dies are equally problematic. You might try a Lee Collet die for neck-sizing only since the Lee die will not touch the body of even an expanded case from an oversized chamber.

thanks stonecreek, does anyone think it would be a problem to resize the loaded round a second time in the 7mm rum die They chamber great after doing that . thanks

No, although unconventional, that shouldn't be a problem. Not sure what it might do to your bullet alignment (concentricity) though.

However, if utilizing your 7mm Ultra die in that fashion allows the cartridges to chamber which otherwise would not, then my theory above is not valid and you'll need to look elsewhere for the cause. It now sounds like significant overpressure of the initial load is the problem, which is not unusual with WSM factory loads.

Thanks to everyone one for the good advice.
Ido know most of the brass I,m using was fired in another 3000 wsm. I think I,ll resize it in the 7 rum die and see how things go from there. again thanks

Just resized 6 cases with the 300 wsm die then resized them again with the 7 mm rum die and loaded them with r19 and 200 gr. speer. Chambered slick as butter. Will try them out one evening this week. thanks

quote:

Originally posted by ho:
Thanks to everyone one for the good advice.
Ido know most of the brass I,m using was fired in another 3000 wsm. I think I,ll resize it in the 7 rum die and see how things go from there. again thanks

There's your problem! Wish you'd said so earlier.

Brass fired in a different chamber is sometimes difficult to resize properly for another chamber -- the dimensions can be markedly different. From what you've said thus far, it is likely that if you use your Ultra die first, then your .300 WSM FL die to resized the necks, that the "foreign" brass will chamber just fine in your rifle.

See if Small Base Dies are available for that caliber; it will save you a step or two from what you are doing.

Small base dies are not available for 300 WSM, and I have never found a use for them in any caliber.