Some may know about the modified 405 in Ruger #1 i've been working loads for and I have come accross a problem and thought I'd bounce it of you all.
I'm shooting a 405 Caliber Cartridge however its been modified to take 3.25" brass with a COL of 4.050. The modification results in significant pressure increases over a standard 405 and I believe the increased pressure has something to do with my problem. Problem is that every 4th or 5th fired cartridge, the case sticks in the reciever and I need to run a rod down the barrel to clear it. Ive noticed that the problem only starts after the reciever and barrel have heated up and expanded. (thus maybe another component to the problem)
Ive gotten a few stories as to what may fix this.
1. The Smith that modified the barrel said he used a finishing reamer and thus no additional polishing is required and the stuck cases are solely due to excessive pressure.
2. A friend with extensive knowlege said that in firearms that consistantly fire higher pressure rounds, it is helpful to polish the breach and that will eliminate stuck cases in most instances. He tells me he has had two rifles that he had sticking cases in and solved the problem by polishing.
3. Back off a gn or two to reduce pressure. (I have tried this method and it is true that it decreased the frequency of stuck cases but did not eliminate them) Thus, I believe heat is involved somewhat.
I have also closely checked the fired cases with a glass for any signs of damage from the breach itself and they look very smooth so I dont believe I have a burr anywhere.
If polishing is the way to go, I concidered rigging a fired case to a rod that I could put in a slow turning drill with some valve polishing compound. Any thoughts on that brainstorm?
I could use some Ideas guys. I cant be out hunting Brown Bear or Moose with a firearm that gets a case stuck randomly.