Looking for bolt ID help

[togor]

would like to see that chart, could you post it?

It's just for my own motley of bolts & actions! Not a general reference. Just which bolts show what when mated to which actions. I store the bolts in one place and the actions in another since things are a bit of a tight squeeze. So for example the BF9 fails a field gauge in the 1.37M action but won't close on a nogo in the 900K, and the NS bolt fails a go gauge in the 900K, and won't close on a nogo in the 1.37M. The rest of them are right in the middle somewhere, so I agree that random bolt swaps weren't a hazard to the troops. FWIW, both the BF9 and NS bolts were NOS when I got them, not hammered down from heavy usage.

[lyman]

It's just for my own motley of bolts & actions! Not a general reference. Just which bolts show what when mated to which actions. I store the bolts in one place and the actions in another since things are a bit of a tight squeeze. So for example the BF9 fails a field gauge in the 1.37M action but won't close on a nogo in the 900K, and the NS bolt fails a go gauge in the 900K, and won't close on a nogo in the 1.37M. The rest of them are right in the middle somewhere, so I agree that random bolt swaps weren't a hazard to the troops. FWIW, both the BF9 and NS bolts were NOS when I got them, not hammered down from heavy usage.

that variation was not likely from the bolts, but likely from the person reaming the barrel when it was installed,

[togor]

that variation was not likely from the bolts, but likely from the person reaming the barrel when it was installed,

Of course. I've mounted & headspaced barrels myself. The procedure is executed with a specific combination of receiver, barrel, bolt, reamer, and gauges. But obviously the bolts I mentioned in my post above are dimensionally different. If I can do an A/B comparison with the same set of gauges and get an internally consistent result, and the only thing changing is the bolt, then that is where the difference is. A difference of 0.010" is all it takes, and that can be had any number of ways.

[fguffey]

If I can do an A/B comparison with the same set of gauges and get an internally consistent result, and the only thing changing is the bolt, then that is where the difference is. A difference of 0.010" is all it takes, and that can be had any number of ways.

I have one 30/06 chamber that is .016" longer than a minimum length/full length sized case. I form 280 Remington cases to 30/06 cases and add .011" to the length of the case from the datum to the case head to get the magical .002" clearance.

.005" added to .011" is .002" longer than a field reject length gage.

F. Guffey

[fguffey]

if you gonna quote, quote the entire post, not take things out of perspective,

I have always though the saying "you need to purchases a bucket of bolts in case the first one does not fit' was cute. A resource person on military rifles has at least 100 03 bolts, I have 35 03A3 replacement bolts. If I needed a bolt to off set the length of the chamber by .004" I could tell him how to determine which bolt I needed; if he needed a bolt I would have to drove over and check the length of the chamber he was working on.

This stuff is not for everyone.

F. Guffey

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and he has at least 20 30/06 head space gage: all I need is one and I showed him a head space gage is not necessary.

F. Guffey

[togor]

I have one 30/06 chamber that is .016" longer than a minimum length/full length sized case. I form 280 Remington cases to 30/06 cases and add .011" to the length of the case from the datum to the case head to get the magical .002" clearance.

.005" added to .011" is .002" longer than a field reject length gage.

F. Guffey

I have a G43 which easily closes on a 8mm field gauge. Its brass is resized .30-06 (Garand once fired is great since the G43 extraction cycle is really tough on brass), that I let run long. Those rounds still easily chamber in the G43 but in the bolt guns they would be very hard. So yeah us reloaders have alternatives for long headspace.

[fguffey]

I have a G43 which easily closes on a 8mm field gauge. Its brass is resized .30-06 (Garand once fired is great since the G43 extraction cycle is really tough on brass), that I let run long.

I have 16 forming dies; included in that bunch is a 8MM57 forming die. The nice feature of the forming die allows the die to be adjusted off the shell holder to increase the length of the case from the shoulder to the case head.

I could never figure how a reloader could miss when forming 30/06 to 8MM57 because the difference in length between the two chambers/cases is .127".

F. Guffey