Do either of these tools fit my need?

[BigMacMI]

My problem is this: Cast boolits sized to not lead my barrel will not chamber properly. They are not hitting the lands, but rather, the boolit diameter (.3585) is just a bit too fat to chamber in the throat. If i size them to .356, I can load them plenty long for my needs, but they are not large enough.

I spoke with Brownells today, but was having a difficult time explaining exactly what I needed... I had initially thought i needed a finisher style throater: https://www.brownells.com/gunsmith-...--sku184053380-17633-11648.aspx?sku=184053380

But he then pointed me to a different tool: https://www.brownells.com/gunsmith-...r-sku513051901-40866-19478.aspx?sku=513051901

It may be that I had my terminology wrong.

I need the 'free bore' area shown below a larger diameter... not necessarily longer. But if it must go longer to get wider, I am OK with that.

I am having an experienced machinist do the work for me. I just need to come up with the tools

 

[edwardware]

1) No disrespect to Brownell's, but you should call David @ Manson and ask him; he's very helpful, and just the expert you need.

2) I can't tell, but if this is 9mm, be warned that you can't hardly scratch a melonited barrel without carbide, and many are. Disregard if this doesn't apply.

3) The easiest option is always to switch bullet profiles. Anything else is added difficulty and expense.

 

[BigMacMI]

1) No disrespect to Brownell's, but you should call David @ Manson and ask him; he's very helpful, and just the expert you need. noted! thanks

2) I can't tell, but if this is 9mm, be warned that you can't hardly scratch a melonited barrel without carbide, and many are. Disregard if this doesn't apply. Thank you. There was a guy doing throating on CB forum, but he doesn't currently have the parts i need apparently. it is 9mm. This may be a deal breaker...

3) The easiest option is always to switch bullet profiles. Anything else is added difficulty and expense. Problem is independent of profile, it's a diameter issue.

 

[drband]

What pistol is this for? Couldn’t you replace the barrel with one properly sized and come out less expensive, particularly considering custom tools and labor? Just a thought.

 

[BigMacMI]

M&P 2.0 9mm.

 

[edwardware]

If the barrel is nitrided (i.e. melonite, nitrocarburized, etc, everyone has their own name brand) you'll ruin the reamer trying to cut it. I learned this after I had the reamer in hand. . .

Edit: Ah, yes, the M&P barrels are nitrocarburized. Give up now; you won't ream it without carbide.

 

[BBBBill]

There's more to it than bullet diameter. Hardness, velocity, and diameter all matter. You may just have the wrong bullet for your gun. You might also try sizing to something less than .3585 and larger than .356.

 

[243winxb]

Throat/leade-Seat the bullet deeper into the case. A shorter COL. When measuring on the bullet, right in front of the case mouth, aim for a .355" diameter. This works with a ogive like in your photo.

Deeper seated bullets require less powder.

Chamber- if the loaded cartridge is to large in diameter to chamber, reduce cast bullet diameter till it does.

9mm cast need a 22 bhn hardness and correct alloy to not lead.

 

[boom boom]

Have you slugged your barrel? It will tell you the diameter of the bullets it needs. Easy enough to do on a pistol barrel if you have the appropriate pure lead ball.