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Coin style head guage

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Shamu View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: January 10 2020 at 11:31am
Right the space is "headspace" the rim is occupying most of it but theres always a minute gap (to allow for dirt & out of spec rims & so on.) Its sometimes referred to as "free, or clear headspace". It in the order of less than a thou & so hard to make a gauge that slim.
The gauge just fills the desired specification exactly, giving a dimension otherwise hard to measure.
Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Honkytonk Quote  Post ReplyReply Direct Link To This Post Posted: January 10 2020 at 11:48am
I just measured the rim thickness of a PPU empty cartridge. It is .06". Help me out here, as I think it's finally sunk in. If I wanted to use a "coin" on top of a cartridge, to make a .074" Gage, the math would be:
.074" (Field Gage)
- Minus .06" (rim width)
- equals a coin of .014"
Does my calculation make sense? The Peek coin would have to be used by itself. I honestly don't know where I went South in my math/ measurements. It was never one of my strong suits in school. In fact, Grade 9 was the hardest five years of my life! Thanks for being so patient, guys!

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: January 10 2020 at 1:20pm
'Fraid not 'mang.
You're over complicating it.
What you've done is to mix 2 techniques together, its either/or not and.
No case! Its done this way in case a case rim is uneven or distorted in some way, far more common than you'd think.
0.074" "coin". That's IT.

Now if you MUST use a case for some reason your math is correct its headspace- rim thickness= washer thickness.

Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Honkytonk Quote  Post ReplyReply Direct Link To This Post Posted: January 10 2020 at 1:29pm
Finally! I get it! After all this, I think I'm gonna tell him to go to Canadian Tire, buy a box of Federal ammo, and forget reloading! His main hunting rifle is a Thompson Icon in .308. We went elk hunting last winter and he had a Parker-Hale .300 Win Mag and I had my No4 Sporter with 180's. He felt I was under gunned.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Zed Quote  Post ReplyReply Direct Link To This Post Posted: January 11 2020 at 2:40am
No one is under gunned carrying a No4 Lee Enfield unless maybe you want to shoot a Rhino.
It's nice to be important, but it's more important to be nice!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Goosic Quote  Post ReplyReply Direct Link To This Post Posted: January 11 2020 at 5:40am
Many moons ago. A family friend dropped a Cape Buffalo with a No4 Enfield using a 215grn bullet.
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