Chamber size increase with use?

[ronas]

I am reffering to 9mm chamber.

I ask because I recently purchased a Smith and Wesson M&P Compact 9. The chamber is clearly smaller than my Beretta 92FS chamber. The S&W chamber is so much smaller that some rounds that will feed, fire and eject perfectly in the Beretta will not chamber in the S&W.

The rounds that I will fire in the S&W I have put in my Dillon case check gauge. All rounds that easily go and and fall out of the Dillon gauge function perfectly in the S&W.

Is this normal?

[mif_slim]

diffrent maker, diffrent chamber spec. some a little larger then others.

[Sideline Shooter]

Also the angle of the feed ramp can play a role especially with different bullet shapes and lengths. That's why you should shoot different ammo in different guns to she what shoots reliably and accurately.

sideline shooter

[Ninja45]

So, they are reloads...

As chambers vary from pistol to pistol, here's what I do with any reloaded rounds I use in any of my pistols. Say I reloaded some 9mm rounds, and I intend to use them in my Glock 17, Sig 226, and CZ75. I will disassemble all pistols, use the diffrent barrels as case gauge check, and then group the different gauged rounds in plastic baggies, labelling the bags with "CZ75 only" or "Glock 17 and Sig 226 only", or "Glock 17 only", etc depending on what particular chamber(s) they fit.

This is the only way I can be assured that my rounds will chamber in my pistol.

Hope this helps.

[ronas]

So, they are reloads...

As chambers vary from pistol to pistol, here's what I do with any reloaded rounds I use in any of my pistols. Say I reloaded some 9mm rounds, and I intend to use them in my Glock 17, Sig 226, and CZ75. I will disassemble all pistols, use the diffrent barrels as case gauge check, and then group the different gauged rounds in plastic baggies, labelling the bags with "CZ75 only" or "Glock 17 and Sig 226 only", or "Glock 17 only", etc depending on what particular chamber(s) they fit.

This is the only way I can be assured that my rounds will chamber in my pistol.

Hope this helps.

Yes, all reloads.

The method you describe would definately work.

I've determined that any loaded round that will easily go into Dillon case gauge and fall out when I turn it upside down will chamber without problem. Your method however would be foolproof.

I only reload two 9mmpistols, the M&P compact 9 and the Beretta 92FS. I have never had problem with a round chambering in Beretta, and I've had it at least 15 years.

[J-cat]

I am reffering to 9mm chamber.

I ask because I recently purchased a Smith and Wesson M&P Compact 9. The chamber is clearly smaller than my Beretta 92FS chamber. The S&W chamber is so much smaller that some rounds that will feed, fire and eject perfectly in the Beretta will not chamber in the S&W.

The rounds that I will fire in the S&W I have put in my Dillon case check gauge. All rounds that easily go and and fall out of the Dillon gauge function perfectly in the S&W.

Is this normal?

What bullet, what OAL? Where is it binding? At the base?

[spencerhut]

[QUOTE=Ninja45;4626895]As chambers vary from pistol to pistol, here's what I do with any reloaded rounds I use in any of my pistols. Say I reloaded some 9mm rounds, and I intend to use them in my Glock 17, Sig 226, and CZ75. I will disassemble all pistols, use the diffrent barrels as case gauge check, and then group the different gauged rounds in plastic baggies, labelling the bags with "CZ75 only" or "Glock 17 and Sig 226 only", or "Glock 17 only", etc depending on what particular chamber(s) they fit./QUOTE]

This is not necessary for general purpose rounds.

If you are loading for a match gun then fitting per chamber, per gun would be fine. If you are loading general purpose rounds, then adjust your resize/crimp/seating depth until the rounds fit in all the guns chambered for the round.

Get a case gauge (optional but they are inexpensive) to make sure you are getting them sized correctly. Then load the bullets a little long and try them in each gun barrel. Shorten the setting depth until the rounds will chamber in all your guns. This is for general purpose ammo. Match ammo needs to be tuned for each gun for best results.

[ronas]

What bullet, what OAL? Where is it binding? At the base?

Rainier 115 grain electroplated bullets with OAL of 1.090.

The brass is once or twice fired Winchester.

And yes they are clearly binding at the base. I reload on Dillon XL650 with no lube with Dillon carbide dies. The sizing die is as far down as it can go, nearly touching the shellplate.

I've tried to measure the difference in size of brass, at the base, that will not chamber but measurement is so close to brass that will chamber I can not get accurate enough measurements.

It seems that at least the Winchester brass may be thicker at the bottom than other brass I use, like GFL, WCC, FC, Blazer, PMC.

I need to try some other brass and see if I have the same problem in the Compact 9.

[BSlacker]

The sizing die is as far down as it can go, nearly touching the shellplate.

There you go right there. Adjust the sizing die to touch the shellplate and then about a 1/8 turn more CW. You want the handle to cam over when it touches the shellplate. The shellplate should be snug on the case not to loose.

[J-cat]

Rainier 115 grain electroplated bullets with OAL of 1.090.

The brass is once or twice fired Winchester.

And yes they are clearly binding at the base. I reload on Dillon XL650 with no lube with Dillon carbide dies. The sizing die is as far down as it can go, nearly touching the shellplate.

I've tried to measure the difference in size of brass, at the base, that will not chamber but measurement is so close to brass that will chamber I can not get accurate enough measurements.

It seems that at least the Winchester brass may be thicker at the bottom than other brass I use, like GFL, WCC, FC, Blazer, PMC.

I need to try some other brass and see if I have the same problem in the Compact 9.

Winchester brass isn't any thicker. Your sizing die is too big. Lots of people have issues with these dies in a progressive contraption because the shellplates are thicker than a typical shell holder and the die cannot come down far enough on the case to size it completely. I suggest you get a Lee "U" die which is undersized and sizes the case more.

What I have done with my setup is shaved .010" off the top of the shell holder and this allows the die to come down far enough to size the whole case. I don't have any binding issues.

Or, you can take the shellplate to a machine shop and have it ground down some.

[ronas]

There you go right there. Adjust the sizing die to touch the shellplate and then about a 1/8 turn more CW. You want the handle to cam over when it touches the shellplate. The shellplate should be snug on the case not to loose.

It's quite possible that my sizer die is not far enough down.

Called Dillon and was told to have die touching shellplate. I know I was not that close I was even thinking the manual said to touch shellplate with die then back up 1/8 of a turn. Not sure about that either.