Has anyone slugged their stock G20SF barrel?

nickE10mm · April 10 2014 06:06:56 PM MDT

My reloading stuff (mic, calipers, push thru slugs, etc) are all in storage but I'll be slugging my G20 barrel for use with cast bullets soon.

Just curious.... if anyone here on the forum has slugged THEIR **STOCK** G20SF barrels... what have the chamber and muzzle end of your barrel diameters measured?

Taking a survey of sorts....

The_Shadow · April 10 2014 07:55:53 PM MDT

I haven't done mine but someone mentioned theirs was 0.401", it can be difficult to measure if the groove is across from the land. ${$default_embarrassed_smiley}$

nickE10mm · April 10 2014 07:57:48 PM MDT

Quote from: The_Shadow on April 10 2014 07:55:53 PM MDT
I haven't done mine but someone mentioned theirs was 0.401", it can be difficult to measure if the groove is across from the land. ${$default_embarrassed_smiley}$

Yep, it can be.... Also works much better with a MIC vs a CALIPER but I'll take either. Just dumb curiosity as I'll know my barrel's dimensions one of these days or weeks....

EdMc · April 15 2014 12:19:30 PM MDT

Nick,
I slugged the barrel in my G20SF a year or so back. It was 0.401
I believe that's common along with the 'generous' chamber.

nickE10mm · April 15 2014 12:24:00 PM MDT

Thanks EdMc.... Was there any difference between muzzle and chamber diameters?

EdMc · April 15 2014 12:41:11 PM MDT

If you mean 'throat' it was ~0.402-0.403 with a taper as near as I could tell due to the poly rifling. By chamber I've compared the ones on the G20SF, my 1006 and Delta.........both the Smith and Colt chambers are tighter than the Glock. Chambers were measured with pin gages. A little trade off for Glock 'reliability'. ${$default_wink_smiley}$

nickE10mm · April 15 2014 01:33:19 PM MDT

Yes, throat is what I meant. Sorry about that. I should have used the correct term. :-)

So, a ~.4025" throat tapering to .401" at the muzzle / crown?

Very nice. I'll have to use at least a .402" boolits ... That's okay I guess. I'll prob eventually go with a KKM anyways.

Thanks a lot for the info sir!!

Yondering · April 15 2014 08:52:07 PM MDT

Nick - if you're loading for only the stock Glock barrel, or can keep the loads separate, you'll get best results with the fattest bullet that will still chamber easily. Stock Glock barrels like cast bullets a little more oversized than others, and a little harder too.

Or powder coat them, size at .402, and run the same bullets in all your 10mm's with no worries.

nickE10mm · April 15 2014 09:14:41 PM MDT

Sounds good, thanks guys!