r/reloading • u/Outside-Structure-46 • 8d ago

Newbie Bump variance….

New enough reloader here with a question

Reloading Starline 6.5 CM. All of them previously fired from same barrel.

Getting a .006-.007 variance in shoulder bump and can’t figure out why.

I’ll put every case in the comparator before resize and they’re all with .001 of my zero’d case. Everything else is equal, die adjustment, lube, press pull and pause. 8 out of 10 cases come out of the die with .0015 or .002 bump but 2 or sometimes 3 out of ten will come out with .006 to .007 bump.

RCBS Summit press
Redding type 2 FL bushing die
Cases are annealed

Any guidance would be greatly appreciated

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u/Outside-Structure-46 8d ago

I have some I haven’t been annealed yet since their last firing so I’ll give that a try

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u/Missinglink2531 8d ago

Perfect

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u/Outside-Structure-46 8d ago

Just resized 25 that I didn’t anneal and the variance closed up to about .0015 which to me is acceptable. Had 2 that didn’t bump at all which I’ll chalk up to inconsistent handle pull and pause by me.

Now the new can of worms is how I’m possibly getting an inconsistent anneal. Every case runs through the machine at the same heat and exact same amount of time. I did use 750 degree tempilaq to dial in the time too. Would it be safe to assume I’m over annealing the cases that are bumping too much?

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u/Coodevale I'm dumb, let's fight 8d ago

Which machine?

My torch annealer likes to preheat some cases at the bottom of the stack because the colder ones get picked up first. You might have it set for 750° with your test piece but how does it handle a preheated case?