9mm bore diameter on the big size?

[tmd17]

...How would you slug this barrel?

A google search will likely produce specific step by step instructions, but the basic process is to drive a SOFT 'slug' of lead through the barrel and measure the diameter of the now rifled slug when it comes out. There is probably at least one thread detailing the process on this forum.

SOFT lead is key. Plumbers lead, pure lead, 'dead soft' lead.

 

[STORMINORMAN]

No surprises.
Not my pistol.

(fine print bottom left: Shooting times )

Then you were at a REALLY far distance from those targets, huh...?

Cheers!

 

[shocker]

I'm shooting 0.356 powder coated cast bullets in a Glock 19X which has the Gen 5 barrel. Seems to work fine.

BTW, if you are shooting one ragged hole at 15 yds with a duty pistol I would love to see a picture of your Olympic medal...j/k.

 

[mikld]

You won't know for sure if you don't slug the barrel. Even poly barrels can be slugged. I don't own any Glocks, but I have a Masada with poly rifling. I did slug and measure the barrel (.355") and it works quite well with jacketed .355"-.356" bullets and good with my cast .357" 125 gr. RNPF bullets, both PCed and lubed...

 

[rockquarry]

I seldom shoot anything but cast bullet handloads in three 9mm pistols, a Beretta 92(?), a Sig P226, and a Walther P4. A .3575" bullet (that's how they come out of a .358" bullet sizing die) works well in all of them. Some pistols may do better with a slighly smaller or slightly larger bullet, a .357" or .358". The bullets needn't be hard; wheelweight alloy of 13-14 BHN is fine and doesn't lead the bore. I'd say shoot the largest diameter bullet that will freely chamber. This applies to cast only as I've had little experience with jacketed bullets in the 9mm. However, diameter is not critical with jacketed bullets for best accuracy. A .355" or .356" bullet should be okay.

If the bullet doesn't chamber freely, it's probably too large or is seated out too far or both. The best cast bullet I've found is a Lyman design: #358212, an obsolete .38 Special mould that casts a 150 grain round nose bullet. It feeds perfectly in my guns and is accurate.

 

[Nevada Ed]

Then you were at a REALLY far distance from those targets, huh...?

Cheers!

Only if'n I try to be as good as I once, was.

My days of steady hands and good eye sight are a thing of the past. Most of my pistol test now, will probably be for just fps data, with a chrony.

By the way, that posted picture was at 25 yards, 30 rounds with a Ransom rest, for those loads.

I did not feel the need to ty the .38 special bullet in any of my 9mm pistols, when I read that rag.