M1917 firing risk

[Chuckindenver]

Attachment 40003Attachment 40004oh,,,cam pressure is the amount of pressure that the locking lugs of the bolt, put on the locking ways inside the receiver ring.
the 1917 pictured has worn locking ways, and had bolt set back, the 1903 pictured little wear and no bolt set back.

[Chuckindenver]

this is case that was fired in a 1917 with bad headspace, said rifle was a =n early Winchester with over sized chamber, and bolt set back.
factory round, case head failed, blew the bottom of the stock off, fractured the trigger guard, and stuck the bolt in the rifle. shooter got away with a few stiches, and was lucky he was wearing glasses.
i repaired the rifle, and repaired the broken stock.

[flygrimm]

Chuck,

To repair that rifle's bolt setback did you just replace the bolt or is there some way to repair the locking ways? Just curious as I will be sending you my P14 for barrel replacement sometime in the future.

Stuart

[Chuckindenver]

no real way to fix that, the rifle in question was a grandpas gun deal, so, i turned the shoulder and breach face back, recut the extractor, with the agreement that it wasnt going to be shot on a regular basis anymore,
the bolt set back wasnt as bad as the the one i have pictured, the worse issue was the over sized chamber, that combined with bolt set back, and alot of hard use.
you can see the case, just how far back it was set.
i normally wouldnt have repaired it, some have tried to weld on the ways, and mill them back to spec, with mixed results, with the amounts of 17s and 14s available...its best to just retire the ones that are worn out.
worse part about it, the only real way to see how bad the set back is, is to remove the barrel, and look, i feel it with my finger nail to see if i can feel a ridge, and take it from that point.

[Promo]

Is this one of the Winchester M1917 with a serial below 5000? Didn't know they had quality problems.

[Chuckindenver]

yes, iv seen more then a few with over sized chambers.. im guessing, but i belive the reamer was out of spec, that they used.

[fguffey]

" If he then just sticks in a no-go gauge and closes the bolt on it, then he has failed the test - not the rifle! The M1917 has a huge camming action, and can quite simply squeeze a no-go gauge down to fit the chamber without requiring much force on the bolt handle. This topic has been covered more than once before, hence the advice you will have found to only go to a gunsmith who knows how to check M1917s. "





"The M1917 has a huge camming action, and can quite simply squeeze a no-go gauge down to fit the chamber without requiring much force on the bolt handle"



The part that no one seems to understand is the part where the no go-gage is squeezed down, the no go-gage is .004" longer than the go-gage, the field reject gage is .005" longer than the than the no go-gage.



Back to the tacky behavior at the Utah arsenal, one smith did not use three different gages, he used one, he measured the length of the chamber in thousandths. the petty little smiths at the arsenal accuse the the one gage smith of stretching receivers (they did not accuse him squeeze-ing the gage down, because they knew the gage was 'tuffer' and had more resistance to compressing than the actions ability to resist stretch/flex) meaning the rifle would flex before the gage would compressed?



A no go-gage is not necessary, a field reject gage is not necessary, camming as in heavy camming of the bolt because it is cock on close is not necessary, back to the smith at the Utah arsenal, he knew it was not necessary to cam the bolt closed, he understood abuse of tools and guns, he was a smith he understood shop practices, he was accused of stretching receivers, he was accused of stretching all the M1917s that went through the Utah Arsenal, he had class, he did not argue with the petty little people he worked with, he was not in a contest for MR. (most) Popular person.



Closing the M1917 bolt and camming, I have never found it necessary to close the bolt with the lugs engaged, I close the bolt with the heel of my hand compressing the spring does not require bolt lug engagement, unless! someone is closing the bolt on something/anything that is longer than the chamber from the bolt face to the shoulder of the chamber, the one gage smith, understood the length of the chamber, he understood the relationship between the length of the chamber and the length of the case.



Back to bolt advance, has anyone measured the difference in bolt advance between engagement and closed on the M1917, Springfield 03 and Mauser, small ring Mauser, again, the lugs on the cock on close small ring Mauser do not contact anything because I applying pressure on the bolt handle with the heel of my hand.



Set-back is caused by a bad habit, then there is the assumption all the problems with perceived bolt set back started after the rifle left the Arsenals, I have M1917s that do not have ware on anything, I have like new M1917s, with long chambers, I off set the length of the chamber with the length of the case. Again, one has .016" added between the bolt face and and shoulder of the chamber, I add .016" to the length of the case from the head of the case to the shoulder of the chamber. One more time, I could order a bucket of bolts, I have 14 bolts, none of the bolts in the bucket or other bolts I have in other M1917s would change and or improve the length of the chamber.



Then there is the other overlooked thing about M1917s, without a barrel how far will a bolt move forward and or backward. The bolt handle is the third lug, it should be easy for someone that is familiar with the M1917 to measure the forward thrust of the bolt without a barrel, or with a barrel if they understand the question. meaning with 'a lot' of ware between the mating surfaces between the receiver and back of the lugs I would think the bolt handle would be worn also, I have no visible indication there is ware between the bolt handle and receiver.



F. Guffey

[Chuckindenver]

maybe your Utah Gunsmith,...will chime in... no one ever said it would squeeze down any gauge..what i said was, felt resistance on the gauge, even if it closed,
the U.S. Military is the ones who have listed how to check headspace on a 1917.
the 1917 has 22 pounds of spring loaded cam pressure, the 1903 has less then 5 pounds. and thats when the bolt is lifted to reset the rifle.
its ok...if you dont agree.. i work on these rifles daily, and these are this Colorado gunsmiths observations.
im one of the few left that will work on them.
the readers can read the posts, look at my pictures see it themselves.
its my opinion.
that any milsurps weapon be checked by a gunsmith for over all safety and headspace, before its fired. these rifles are almost 100 years old, and saw hard service, and who knows what type of use and abuse over the years..
some collectors are able to do these things them self, others are not..
use your best judgement what shooting any weapon..

[fguffey]

"maybe your Utah Gunsmith,..."



He was not my gunsmith. He worked at the Utah Arsenal.



Patrick Chadwick
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Avoid all risk and give it to me.

Oh dear, that is geographically impractical, so I'll have to give you some advice after all...

1) By all means take it to a gunsmith. If he then just sticks in a no-go gauge and closes the bolt on it, then he has failed the test - not the rifle! The M1917 has a huge camming action, and can quite simply squeeze a no-go gauge down to fit the chamber without requiring much force on the bolt handle. This topic has been covered more than once before, hence the advice you will have found to only go to a gunsmith who knows how to check M1917s.
M1917 has a huge camming action, and can quite simply squeeze a no-go gauge down to fit the chamber without requiring much force on the bolt handle




Patrick Chadwick said "M1917 has a huge camming action, and can quite simply squeeze a no-go gauge down to fit the chamber without requiring much force on the bolt handle". You said nothing, I will assume/assumed you agreed.



I did not agree, I do not agree, with all the lofty terms and descriptions about the M1917 being used I wanted to know just how much bolt advance there is on the M1917, I doubted anyone on this forum has ever measured bolt advanced on the M1917, and I doubted anyone on this forum has ever compared the bolt advance on the Springfield with the M1917 or compared the advance of the M1917 with the bolt advance with the Mauser. Patrick took the liberty to refer to the advance as "HUGE!" so much 'huge' closing the bolt can crush/shorten/squeeze the no go-gage.



and, I thought someone would explain the bolt third safety lugs effect on the bolts ability to move forward or back, all of this without upsetting someone or anyone.



F. Guffey