Does groove distance of barrel vary among models, e.g. Sig P220 10mm?

[kmcdonou]

I am wanting to shoot cast bullets in my Sig P220 10mm. I have read you want to size the bullets .001-.002 above the groove diameter in your barrel.  I know I will need to slug my barrel to find this out, which I am a little concerned about screwing something up.  I know Meister's Bullets sells a kit for doing this:https://www.meisterbullets.com/slugyourbarrelsdetails.asp. 

However, I am wondering if anyone has found the groove diameter in Sig P220's varies much and has anyone slugged their barrel to find out the measurement? 

Thanks much

[The_Shadow]

Bullets sized to 0.401" should be just fine from the SIG P220   I size all of mine at 0.4015" on my STAR sizer lubricator!

[kmcdonou]

Yes, that is what I was hoping. However, I always hear people saying you need to slug to be sure. I was hoping the groove diameter would be fairly consistent in the Sigs and I wouldn't have to do that.  I still might, but rather avoid it if possible.

[CtYankee]

I don't have a SIG, but I have slugged a few barrels. Slugging a semi-auto pistol is easy: you remove the barrel, lube it well and drive the slug down from the chamber. Revolvers are a little more of a pain. I would make the assumption that a Sig will have a properly sized barrel and start with .401 bullets.

[sep]

I'm with CtYankee on this one or you could call or email Sig to ask them what their groove diameters run in size.   

[Kenk]

Shoot Michael Chandler from Sig an email. He has helped me several times with my P220 Elite 10mm, and is very knowledgeable
Michael.
Chandler@sigsauer.com

[gnappi]

When I wore a younger man's clothes I lubed the barrel, loaded a round with primer only and shot it in the pool at night. Most of the time it splashed harmlessly in the pool, if it stuck in the barrel it was very near the muzzle and easily driven out.

Nowadays I cast, size, and shoot at the range at varying distances and if I don't get keyholes with a known good powder and bullet combos, I'm done. Not very often have I had to buy another Star size die, and then only once for a .357 pistol did I have to spring for another die.