if he was only having tight brass I'd agree with you, but seems hes also getting ejector marks, Personally I'd wager he's making pressure for what ever reason, I'd back the load offBINGO!!! WE HAVE A Winner!
if he was only having tight brass I'd agree with you, but seems hes also getting ejector marks, Personally I'd wager he's making pressure for what ever reason, I'd back the load offBINGO!!! WE HAVE A Winner!
I had the same thing happeing on my brass. My assumption, which is why I honed the chamber after speaking to Dave Manson, is that the brass didn't have enough space to expand in diameter in the tight chamber and so it grew more so in length and was not able to spring back as it would in a more optimally sized chamber. Once I expanded my chamber diameter, per Dave Manson's recommendation, the brass expanded and sprang back as it should. The brass goes plastic during the ignition/expansion process. I can now use higher pressure loads in that chamber without the issues observed previsouly - all within reason of course. That short barreld 30-06 shoots .5 MOA with brass FL and neck sized with any and all of my 3 sets of dies. I have lightly honed all of my chambers to ensure they are less likely to cause problems, and I always run Brake Cleaner on an oversized cotton swab (bought a bunch at the autoparts store) through the chamber to clean the gunk out - they get crusty.if he was only having tight brass I'd agree with you, but seems hes also getting ejector marks, Personally I'd wager he's making pressure for what ever reason, I'd back the load off
My measurements noted it at one and a half thousandths (.0015) but might come out a bit more based on fired cases. My calipers aren't very high quality.AckleyFan, how much did you open up the chamber?
I didn't document all this before I gifted the rifle to my hunting buddy for his retirement. Dave was giving me min/max specs on chamber/cartridge measurements. If I recall correctly he was suggesting .003 - .004 clearance. I was working with him on a few items. Factory 280AI brass is about minimum SAAMI spec where chambers and reamers tend to be at maximum spec - so I'm getting bulging cases after firing @ the start of the web. I have to live with this until I decide to rebarrel and use my custom ground reamer, then start all over. I want .466" at the .200 line for my 280AI's and 257AI, not .471" due to the small brass diameters. Living and learning...So, if you took a new case, subtracted the new web dia, what would the new clearance be?
After doing more research, yes, there is an Alex Wheeler (AW) reamer for the 7PRC. JGS sells them. charliehorse27 on this forum has a reamer kit that he'll rent. I'm just waiting for the kit to be available then I'll get on with fixing my rifle.I do know there was a mismatch at the 200 line of the 6.5 and 300 PRC cases. I know @Alex Wheeler had reamers to correct these issues, maybe there's one for the 7 PRC also?