Originally Posted by nugentfan
Hey I have a Gibbs and am having bad luck with brass and fireforming. My dad built it about 15 years ago and we started with 30-06 put in a .270 die then in the .25 Gibbs die. We had problems with the neck splitting so I bought a box of 25-06 and loaded out to the lands. The primer strike seats the bullet deeper and leaves only a light dent on the primer. Should I try the Unique and filler or different bullets? Anneal the necks? How about the lee crimp die? Am using this gun on a desert sheep hunt but running low on brass and time. Do have 30 rounds loaded for the hunt, 10 practice rounds and 6 more to load. Wish I could get the extra 100 ready though. Very accurate and nice shooting round. Dad killed his 2 biggest mule deer with it. Load is 59.0 H4831 with a Sierra 117 BT. Want to get a load for TSX's , Ballistictips, ACCU-BONDS or Swifts shooting for this gun. Seems like fireforming/wildcat help is hard to come by.Thanks for any help. Gene
I am not familiar with the gibbs. If it is an "improved" it should headspace properly when formig brass. With what you are discribing, it sounds like a true "wildcat" and will need to have specal attention to take care of the headspace issue.
(1) Put a small amount of "very fast" powder and top it off with cream-O-wheat and cotton, point the gun up, and fire form. I have never tried it, and my advice is talk to a gibbs shooter who has used this method before you try it. Use 25-06 brass
(2) Just seat the bullet long with lots of neck tension and just shoot. This sounds like what you have tried, and it didn't work. Use more neck tension and be sure to "jam" the bullets. Some of the guys out there don't believe in this method. Use 25-06 brass
(3) Buy an expander die and expand the neck up to .264, and then size them back down to .257 just far enough so that the case will just fit. Buy a true expander die with the propper expander button. I have wrecked more brass just using a regular expander button that is one size bigger. (ie..using a 264 die to expand your 25 cal.) Use GOOD LUBE. I like to feel a good amount of resistance on the bolt when closing it on the brass. Now you have created a "false" sholder in which to headspace off of. I would still jam the bullet for extra resistance. I would use max loads for the 25-06 to do the fire forming. You should get nice sharp sholders. Some of the guys out there actualy compete while FF brass. AND THEY WIN!!ge(
You might be able to use 270 brass and skip the expander step. You just size enough of the brass so that it fits snugly into the gun. You just need to form a faulse sholder in which to headspace off of. If you have a bushing die (and you should) you could buy a bushing around .260 and take it down it two steps.