300 WSM ??

[R.Morehouse]

Ran into something new to me. I have 300WSM brass ( Norma & Bertram ) that i was getting ready to turn necks. I ran the brass through the expander die ( I have used this mandral to neck up 30 Major from 6.5 and to expand 300 RUM brass with out issue ) and after a good number realized that it was sizing the neck as well as deforming the case below with a nice bulge at the body/ neck junction. The brass was properly lubed, some necks were a little tighter than others. I ran a few of the bulged pieces through the FL sizing die and tried them in the chamber and they will not go. I have sized up & down quite a few rounds with never an issue but this is my 1st. go at 300WSM. Have any of you guys experienced with this 300WSM brass??........What do you think went wrong.....
Thanks for your input.....

Best Regards
Rick

 

[LA50SHOOTER]

Was it Both Norma & Bertram brass that did this or just one of the spoken 2 ??
I've worked a good bit with Norma brass but not the Bertram. - I've neck-turned over 1600 pieces of 300 WSM in the last 8 months so I understand what your doing. - When I did the brass I was working with I used a standard Sinclair 30 cal. (E30)expander mandrel & used Sinclair neck turning oil for my lube, applied inside the necks of each case with a Q-tip. - Never had a problem with any of it. And it all went across the mandrel without a whole lot of force & I lubed every one of them as well.

Ron

 

[dkhunt14]

I have done many Norma cases and not an issue. I use a Q-tip and put imperial lube inside neck. It takes very little pressure to expand them. Some it hardly touches. Seems Maybe your expander might be big. I can seat a bullet after expanding with plenty of tension. Matt

 

[R.Morehouse]

Thanks for the input guys. My mandrel is the Sinclair as well. I will check it out for size. I can turn both down if need be. I used Imperial also but i have some slicker stuff here i can try. Both Norma & Bertram gave me the same result. I tend to be a little "Ham Fisted" when it comes to things.....I will give it another shot...

 

[dkhunt14]

Make sure you chamfer then and start the mandrel in. I never had a problem. Matt

 

[mr45man]

Back off the die

 

[R.Morehouse]

Back off the die

Yeah I make sure that's good........Thanks "45"