DoneNOut
Well-Known Member
Sent a barrel in to have chambered for 7mm-08AI. They said I could send them a 7mm-08AI go gauge, or they would just use a 7-08 go gauge + .004. What do you think?
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7mm-08 Go Gauge for 7mm-08AI?
- Thread starter DoneNOut
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59FLH
Well-Known Member
If you have the AI go gauge in you possession send it,....why not. If not, flip a coin.
The Go gauge actually becomes the NO GO gauge.....better clarify that. The AI is actually Shorter than the parent case so it would be Go minus .004. I like Minus .006 to minus .010, and on the minus .010 I run new brass through the full length sizer and bump back. New brass will vary a little on the headspace length.
DoneNOut
Well-Known Member
Ok, That is what I was thinking. I will just buy a gauge and send it. My 243AI gauge from Forster worked great in my rifle.
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Would not the 243AI go gauge work?
DoneNOut
Well-Known Member
I'll be daggum. The bodies are the same aren't they. BALD moment here! LOL Thanks
Elk Hunter 338
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EASY BUTTON!! Use your desired NEW brass and set a .004".005" "crush" on full bolt close .. DONE!
PO set the chambers up to be able to be done exactly this way..
PO set the chambers up to be able to be done exactly this way..
DoneNOut
Well-Known Member
I'm not doing it. A shop is. I'll send them the gauges. LOL
std7mag
Well-Known Member
If my smith didn't already have a 308, 243, 260, 7mm-08 headspace gauges, I'd be finding another smith!
scpaul
Well-Known Member
Seems to me that a set of gauges would be easy enough for gunsmith/engineer to whip up. If you do use the P.O. Ackley brass method I'd probably pack it with epoxy to ensure that over the years it doesn't get changed through use.
JGS makes my "GO" gauge -004 for an AI Cartridge "GO Gauge".
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shortgrass
Well-Known Member
Seems like only the new age guys and hobbyists need an Ackley Improved "GO" gage. Using the "GO" for the 'parent cartridge' as the "NO-GO", and then double checking with a virgin piece of brass (of the parent cartridge) to verify 'crush' is all I've needed for the past 31yrs. In this thread I have read .004-.005, .004-.006, and as much as .010 less than "GO" gage of the parent cartridge. 004-.006 as P.O.Ackley said is plenty, and makes up for variations in cartridge case manufacture. The goal is to have the cartridge case supported between the bolt face and the neck/shoulder junction of the chamber. .001 crush would be enough, as the support at the bolt face and neck/shoulder junction is present. That is all that's required, support for fireforming so the case stretches at the front end, and NOT at the head end. I'm in the camp that says more than .001 or .002 because of possible variation in brass. I am a gunsmith school graduate (Montgomery Community College class of '93) and that was what we were taught. The reamer/gage makers hadn't caught on that they could make more money selling a gage that hadn't been needed since Ackley came up with his Improved line of chamberings. Insert the 7mm/08 "GO", and if the bolt handle starts down its path to "closed", remove the gage and insert a virgin piece of 7mm/08 brass and feel the crush. Strip the bolt of its firing pin assembly and plunger ejector (if it has one) before any gaging. Slip the brass/gage under the extractor so it won't give a false 'feel'.
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scpaul
Well-Known Member
When I built my Valkyrie Mag. Dave Kiff educated me about that. I appreciated it very much.
