I've reloaded plenty of pistol ammo , but I'm new to rifle (HXP all used up) , so , I think I have all the basic Kit to reload for my '39No.1 MkIII(.303) . All my fired brass comes out of the same gun and the neck-sized and trimmed reloads shot well , but closing the bolt was quite stiff . So on the next batch I thought I should screw in the collet neck sizer an extra turn , as per instructions , giving it that extra push after it stopped , as per instructions . OOPS , there was a nasty crunch , thought I had buckled the case shoulder ... but the case was ok , so I dismantled the die and discovered that I had stripped the thread on the ally screw cap ! Said "oh bother" or something to that effect , then lubed all and full length sized . Can anyone tell me where I'm going wrong with my neck sizing ?
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