is this actually a collet die? if so and its actually a lee,setup is absolutly critical.IT WILL NOT work if you set shoulder back even .001 too far or its the least amount long.since it uses the shoulder of the case to work the collet.in fact they are very hard too use correctly but when you do get them setup they work very well.two things i would check,first make sure crimping die is absolutly clean and i do mean spotlessly clean.collet simply will not close far enough with one speck of dirt or crud in grooves. next make absolutely certain you have the decapping resizing die set up absolutely perfect.ANY variation in the shoulder spacing will cause bullets to be crimped less.if your absolutly POSITIVE you have dies set right,you may have to buy a collet for a 307 size bullet.the idea behind a collet die is simply it crimps the case to the bullet,theoreticaly keeping it more centered in the bore.if your checking bullet fit just after youve ran case through the sizing die ,bullet wont be as tight as on other dies.its only tight when collet crimps case on bullet itself.the sizing dies only resizes the case enough to hold bullet until collet crimps case neck. personally,i dont really care for their collet dies,just too hard to setup and use if you load for various calibers.if you were reloading simply for one rifle and had your loader setup for that they work good.years ago when i was target shooting i had two presses setup one held the sizing die,one held the other.i neck sized only and the collet bullet crimp die was setup and never moved. what you may try is simply turning die down in press about 1/4 turn at a time. bullet doesnt HAVE to be crimped real tight,in fact it raises pressures to do so.idealy you would have bullet just held tight enough it would stay in place during recoil,while giving consistant ignition with your chosen powder.really slow burning powders generally require more bullet friction than a faster burning powder for consistant ignition and pressures.
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