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Re: fireforming rimless cases

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06 October 2004, 04:30
dgkenned1
Re: fireforming rimless cases
Quote:

A very small amount of lube on the case will eliminate any of these worries. It will increase backthrust slightly, but creates no problems when using light/fireforming loads. I generally lube every other case, when fireforming. It pretty much eliminates case stretching.


this sounds reasonable and i'd like to give it a try. to be clear i have a few questions:
1.) what type of lube, forming/resizing? i use rcbs.
2.) how do you lube the case, roll it on a lube pad and lightly lube the neck with your fingertips (every other case) but none on the shoulder?
thanks,
dave.
05 October 2004, 13:11
dgkenned1
when fireforming rimless cases in a push feed rifle like a rem. 700 or model 7 by seating the bullet out and jamming it into the lands, doesn't the plunger on the bolt face prevent the case from being up against the bolt face? seems like a lot of spring tension to overcome.
thanks,
dave.
05 October 2004, 17:47
DuaneinND
Your brass will form better if you remove the ejector button spring. There will also be an increase in accuracy potential.


www.duanesguns.com
05 October 2004, 19:13
dgkenned1
Quote:

I have been fireforming for my .260ai in a M700. I very firmly seat the bullet into the lands & use a med. load/med. bullet weight (120gr). I've had no problums w/ 60rds so far.


correct me if i'm wrong but when you form new brass in an
a.i. chamber some part of the factory brass,s shoulder headspaces someplace on the ackley shoulder which locates the brass and keeps it from going to far forward. with a positive stop like this the plunger spring would have little choice but to compress. but on a cartridge that your trying to move the shoulder forward, the cartridge is basically headspaceing on the bullet against the lands and i was wondering if neck tension on the bullet will overcome the plunger spring and allow the case head to rest against the bolt.
dave.
06 October 2004, 01:45
Bug
A very small amount of lube on the case will eliminate any of these worries. It will increase backthrust slightly, but creates no problems when using light/fireforming loads. I generally lube every other case, when fireforming. It pretty much eliminates case stretching.
05 October 2004, 14:36
fredj338
I have been fireforming for my .260ai in a M700. I very firmly seat the bullet into the lands & use a med. load/med. bullet weight (120gr). I've had no problums w/ 60rds so far.