[tahunua001]

the subject says it all guys. my paperwork is off to the CMP and I have questions.

what is the average throat/muzzle wear of a service grade M1 and how do those translate to inherent accuracy compared to a new bore?

I have a number of 1947-73 30-06 ammo, mostly lake city of varying types, is all of this stuff M1 safe or was there hotter stuff to look out for?

also, I got it loose in ammo cans, how can i tell if it's lake city or reloads?

I know some of my ammo is corrosive. do I have to pay any special attention to the gas tube/piston system when shooting corrosive ammo or is it a necessity to clean it regardless of ammo shot through it?

[1911Jeeper]

I suggest you visit some of the M1 specific forums and read some of the threads for more info. Be sure to see the FAQ and technical stickies at the top of the Forum pages.

The CMP Forum has tons of M1 info and FAQ pages.

A clean weapon is a happy weapon. If you shoot corrosive ammo, or suspect corrosive ammo, clean immediately.

http://forums.thecmp.org/index.php
http://www.milsurps.com/index.php

[SilentScream]

As far as throat erosion goes, it won't be as big of a deal as a lot of Garand guys make it out be, like a lot of the gun voodoo that drives gunsmiths like myself crazy sometimes it comes from the match shooting community. That being said, yes excessive throat erosion will be detrimental to MATCH accuracy, however for 90% of M1(or just gun owners in general) throat erosion will not effect practical accuracy of the rifle.
As for your ammo, depending on how old it is, there may not be a way to tell whether they are factory or hand loads. And yes you'll need to monitor the gas system after corrosive ammo is fired through the rifle, clean it as you'd clean the bore and keep an eye on it for a week or so after you put it away to make sure no rust/corrosion develops.

[tahunua001]

like a lot of the gun voodoo that drives gunsmiths like myself crazy sometimes it comes from the match shooting community. That being said, yes excessive throat erosion will be detrimental to MATCH accuracy, however for 90% of M1(or just gun owners in general) throat erosion will not effect practical accuracy of the rifle.
key phrases in that paragraph "match accuracy" and "practical Accuracy" this is exactly what I am looking for. I am looking for a good shooter, I intend to shoot the cheapest junk i can find and reasonable hunting ranges(hence corrosive ammo of dubious origins).

I have no problem picking up a C&R rifle that is only capable of 2 moa, that was considered more than satisfactory to kill a nazi and it's more than satisfactory to kill a deer. I am just curious about the actual level of accuracy drop between say a 1 and a 3? quarter MOA? half? if it is something trivial like that then I'm not worried in the least but if the difference between a 1 and a 2 is an entire inch then I'd be a little unhappy if CMP ships a gun to my door that measured out to be a 4.

[cfullgraf]

the subject says it all guys. my paperwork is off to the CMP and I have questions.

what is the average throat/muzzle wear of a service grade M1 and how do those translate to inherent accuracy compared to a new bore?

Your M1 will meet or be better than what CMP states in their description of of the condition for a service grade.

have a number of 1947-73 30-06 ammo, mostly lake city of varying types, is all of this stuff M1 safe or was there hotter stuff to look out for?

also, I got it loose in ammo cans, how can i tell if it's lake city or reloads?

I know some of my ammo is corrosive. do I have to pay any special attention to the gas tube/piston system when shooting corrosive ammo or is it a necessity to clean it regardless of ammo shot through it?

If you inspect the primers and and they are crimped in place, then it should be new. I do not think any US arsenal loaded military ammunition that would be unsafe for the M1 but I could be wrong. Factory commercial ammunition can damage the operating rod without a gas relieving gas plug. The port pressure is too high with commercial ammunition.

If the crimp has been removed, it will be reloads. If it is reloads and you do not know the origin, i would disassemble the rounds and reload them with non-corrosive primers and a known powder.

Lots of folks shoot corrosive ammunition and clean the firearm appropriately afterwards. I do not and only shoot non-corrosive ammunition in my M1s. Your choice. Clean your M1 properly after shooting corrosive ammunition.

Yes, i would clean the gas tube after shooting corrosive ammunition as well.

The forums that cater to the M1 would be an excellent place to gather information. Check out the CMP forum.

Hope this helps.

[SilentScream]

You can expect practical accuracy of about 4moa out of just about any modern U.S. martial arm. Most will obviously shoot much better than that, some worse. I have a 1954 dated M1 I hand picked from the Anniston CMP depot a couple years ago, it will sustain roughly 3moa all day with a pitted bore, and old Korean surplus ammo.