Thread: RCBS Dies... Problem?

I would say your new dies have a smaller body and base dimension than your old ones, this will cause tight sizing that last few mm as it is squeezin the whole body and base in smaller, this should make em chamber more easy but that brass has to go somewhere and it goes forward and pushes the shoulder forward, this should show as easy to chamber but hard or impossible to close bolt, check with vivid or some marker where the empty sized case is binding on the mouth/neck/shoulder and body.
Necks generally can be quite a bit longer than SAAMI spec in a SAAMI spec chamber but if that is the cause trim, if not then most likely the shoulder has moved forward, on the same case wind down an 1/8th of a turn until it will chamber with the slightest resistance on bolt closing=Zero headspace go down max 1/8th turn more and test another couple of brass and if all good you should be all set up, recheck for any sign of excesses case length.

Originally Posted by veitnamcam

I would say your new dies have a smaller body and base dimension than your old ones, this will cause tight sizing that last few mm as it is squeezin the whole body and base in smaller, this should make em chamber more easy but that brass has to go somewhere and it goes forward and pushes the shoulder forward, this should show as easy to chamber but hard or impossible to close bolt, check with vivid or some marker where the empty sized case is binding on the mouth/neck/shoulder and body.
Necks generally can be quite a bit longer than SAAMI spec in a SAAMI spec chamber but if that is the cause trim, if not then most likely the shoulder has moved forward, on the same case wind down an 1/8th of a turn until it will chamber with the slightest resistance on bolt closing=Zero headspace go down max 1/8th turn more and test another couple of brass and if all good you should be all set up, recheck for any sign of excesses case length.

What do you man by wind down VC? Wind the die down further? I have it setup so that shellholder stops on bottom of the die as per instructions with the dies... They seem to be sizing to spec well I just cant understand why I nearly have to rip my press off the bench especially when they are not stretching much during firing so the die isnt actually doing much sizing really.

Originally Posted by Ryan_Songhurst

What do you man by wind down VC? Wind the die down further? I have it setup so that shellholder stops on bottom of the die as per instructions with the dies... They seem to be sizing to spec well I just cant understand why I nearly have to rip my press off the bench especially when they are not stretching much during firing so the die isnt actually doing much sizing really.

You are hitting the case holder while on the sizing stroke with a case being sized?!?

First ascertain where the case is stopping you chambering it, if it is at the mouth all good trim, if it is at the shoulder your die needs to go down, die setting instructions are shit....dont set to touch the case holder set to match your rifles chamber lenght/headspace.

If it is tight on the shoulder the die needs to go down, if it is kissing the shell holder WHILE SIZING the case you need to remove some of the die from the bottom.
presses stretch and kissing the holder with no case can be miles of with a case.

Originally Posted by veitnamcam

You are hitting the case holder while on the sizing stroke with a case being sized?!?

First ascertain where the case is stopping you chambering it, if it is at the mouth all good trim, if it is at the shoulder your die needs to go down, die setting instructions are shit....dont set to touch the case holder set to match your rifles chamber lenght/headspace.

If it is tight on the shoulder the die needs to go down, if it is kissing the shell holder WHILE SIZING the case you need to remove some of the die from the bottom.
presses stretch and kissing the holder with no case can be miles of with a case.

I think he can chamber it and the measurements stack up its just tight as on the way out of the die

Originally Posted by Gibo

I think he can chamber it and the measurements stack up its just tight as on the way out of the die

He said excessive resistance closing the bolt.

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He did, my bad As you were mate ha ha ha