Possible to throat a barrel too long?

[Underwhere]

I bought a Manson throating reamer. Too many of my barrels need short OAL rounds.

So I fashioned up the longest round I think I could use with the widest ogive to use as the test round.

A few turns and my mid length round easily fits. But a few more turns and my longest one still doesn't.

I'm hesitant to continue reaming until this test round fits.

Can you throat a barrel too long? I haven't found much to say it affects accuracy.

• My longest dummy round is 1.15
• My midlength dummy round is 1.12 and works more often (but not always because of the ogive)
• Winchester White Box is 1.185

The bullet in question is a coated 115gr Bayou Bullet

[Scarlett Pistol]

Max OAL for 9mm is 1.169

When I reamed the throat on one of mine I used a 147 grn conical flat point. It was the deepest I would need to throat for in my reloading. I set it to 1.175 or so and used it as my round for checking the depth I wanted my throat. You can go further and use different rounds but that was what I went with for the bullets I run.

Since I have been shooting 115 gr I haven?t throated any more, but that little OG 75 Compact still shoots more accurately than me and eats everything.

[Underwhere]

Max OAL for 9mm is 1.169

When I reamed the throat on one of mine I used a 147 grn conical flat point. It was the deepest I would need to throat for in my reloading. I set it to 1.175 or so and used it as my round for checking the depth I wanted my throat. You can go further and use different rounds but that was what I went with for the bullets I run.

Since I have been shooting 115 gr I haven?t throated any more, but that little OG 75 Compact still shoots more accurately than me and eats everything.

Thanks for the info.
Strange. My WWB is so long.

Also. Strange was the reamer worked fine on a pre-b and a Tristar barrel but when I tried it on a shadow 2 barrel it didn't cut at all. I wonder if it's coated or treated.

I also wonder if I dulled my reamer on it.

[Scarlett Pistol]

Max OAL for 9mm is 1.169

When I reamed the throat on one of mine I used a 147 grn conical flat point. It was the deepest I would need to throat for in my reloading. I set it to 1.175 or so and used it as my round for checking the depth I wanted my throat. You can go further and use different rounds but that was what I went with for the bullets I run.

Since I have been shooting 115 gr I haven?t throated any more, but that little OG 75 Compact still shoots more accurately than me and eats everything.

Thanks for the info.
Strange. My WWB is so long.

Also. Strange was the reamer worked fine on a pre-b and a Tristar barrel but when I tried it on a shadow 2 barrel it didn't cut at all. I wonder if it's coated or treated.

I also wonder if I dulled my reamer on it.

Ahhh yeah.... the P-07 P-09 and S2 have nitride treated barrels. Your reamer will not cut those. You need a special reamer or just send it to a shop that has one. Real PITA... sorry

And I realized I didn?t really answer your question. You could go far enough that I would impact accuracy, so I?d recommend going just as deep as you need and nothing crazy.

[copemech]

think I would stick with a conical bullet like the XTP for testing as the straight part is the most limiting factor and most round nose bullets with an ogive will load long enough from that point and if not, well find a better bullet because there are plenty enough around,

[Underwhere]

Max OAL for 9mm is 1.169

When I reamed the throat on one of mine I used a 147 grn conical flat point. It was the deepest I would need to throat for in my reloading. I set it to 1.175 or so and used it as my round for checking the depth I wanted my throat. You can go further and use different rounds but that was what I went with for the bullets I run.

Since I have been shooting 115 gr I haven?t throated any more, but that little OG 75 Compact still shoots more accurately than me and eats everything.

Thanks for the info.
Strange. My WWB is so long.

Also. Strange was the reamer worked fine on a pre-b and a Tristar barrel but when I tried it on a shadow 2 barrel it didn't cut at all. I wonder if it's coated or treated.

I also wonder if I dulled my reamer on it.

Ahhh yeah.... the P-07 P-09 and S2 have nitride treated barrels. Your reamer will not cut those. You need a special reamer or just send it to a shop that has one. Real PITA... sorry

And I realized I didn?t really answer your question. You could go far enough that I would impact accuracy, so I?d recommend going just as deep as you need and nothing crazy.

Thanks for the info on the barrels. I wish I knew that before attempting the S2. Oh well.

[Underwhere]

think I would stick with a conical bullet like the XTP for testing as the straight part is the most limiting factor and most round most bullets with an ogive will load long enough from that point and if not, well find a better bullet because there are plenty enough around,

Yea the Bayou has been problematic for me. I loaded 3k long before I realized it wouldn't chamber in some of my CZ's.

Lesson learned.

[SI VIS PACEM PARRABELLUM]

think I would stick with a conical bullet like the XTP for testing as the straight part is the most limiting factor and most round most bullets with an ogive will load long enough from that point and if not, well find a better bullet because there are plenty enough around,

Yea the Bayou has been problematic for me. I loaded 3k long before I realized it wouldn't chamber in some of my CZ's.

Lesson learned.

Been down this road before. Couple years ago I had to disassemble about a thousand rounds that I loaded for my 3rd gen S&W's many years ago. Those guns are gone now and the rounds were too long for my CZ's.

[Underwhere]

Other than the S2, P07 and P09 do you know of any other CZ's that have nitrided, chromed, melonited barrels to avoid. I think I need to send my reamer in for sharpening.

 I had it for 4 hours before screwing it up

[Underwhere]

Yep. I had to buy a new reamer.

The cost to ship and re-cut my reamer just wasn't worth it so I ordered a new one after talking to Manson Reamers today. They were very nice about it and didn't laugh too hard.

So nitrided and hard chromed barrels are a no-go with reamers.
FYI: Carbide crowning tools are ok to use on hard chrome. Not so much with nitride.


Here I think you can see the rounded edge of the reamer.

[Scarlett Pistol]

I think the P-10 C as well. Not totally sure though.

[Underwhere]

I know this is a CZ forum but there are some times I just gotta love Glock. I've never had an issue with long rounds or strange ogives. My longest round drops into every single Glock barrel I could find.

They just aren't as fun nor as pretty. I guess there's a give and take.

[Scarlett Pistol]

I know this is a CZ forum but there are some times I just gotta love Glock. I've never had an issue with long rounds or strange ogives. My longest round drops into every single Glock barrel I could find.

They just aren't as fun nor as pretty. I guess there's a give and take.

This is true. No pistol is perfect. The Glocks have tons of aftermarket barrels to increase accuracy. They get longer throats, but less accuracy.... Amongst other things. Not saying the longer throats cause less accuracy.

[Earl Keese]

I can see wanting to load one bullet profile for all of my 9's. However, it isn't that difficult to find a profile that works w/o extensive throating.

[rhart]

Yep. I had to buy a new reamer.

The cost to ship and re-cut my reamer just wasn't worth it so I ordered a new one after talking to Manson Reamers today. They were very nice about it and didn't laugh too hard.

So nitrided and hard chromed barrels are a no-go with reamers.
FYI: Carbide crowning tools are ok to use on hard chrome. Not so much with nitride.


Here I think you can see the rounded edge of the reamer.

Did you buy the same reamer or the special one for nitrided barrels?