20Gauge shotgun slug - The Firearms Forum

gerard488 · 11-04-2011, 08:43 PM

Can anyone tell me the actual diameter of a 20 gauge slug and also the the inside diameter at the muzzle of a 20 gauge with a full choke?
I have a H&R 24 gauge that was drilled/resized at the breech about 60 years ago to fire a 20 gauge shell.It has a 24 inch barrel so I guess that was cut back to eliminate the full choke. This gun has seen lots of use and it`s a deadly little rabbit gun. It has a little extra kick because of the smaller barrel. It measures .567 inches internal diameter at the muzzle, I`m just wondering if there is a slug I could use in it.

Old Grump · 11-05-2011, 10:40 AM

.615 is the nominal size but it varies among manufacturers. If it's a Foster or Brenneke rifled slug don't worry about it, the only choke you have to worry about is super full choke, ie. turkey choke. If it's a little over size it will swage down harmlessly in your choke and if its a little undersize the full choke will help you shoot it more accurately. I have one on my desk in front of me and it only measures .610. I don't think my gun notices the difference.

11-04-2011, 08:43 PM	#1
gerard488 V.I.P. Member Join Date: Mar 2011 Posts: 70	20Gauge shotgun slug Can anyone tell me the actual diameter of a 20 gauge slug and also the the inside diameter at the muzzle of a 20 gauge with a full choke? I have a H&R 24 gauge that was drilled/resized at the breech about 60 years ago to fire a 20 gauge shell.It has a 24 inch barrel so I guess that was cut back to eliminate the full choke. This gun has seen lots of use and it`s a deadly little rabbit gun. It has a little extra kick because of the smaller barrel. It measures .567 inches internal diameter at the muzzle, I`m just wondering if there is a slug I could use in it. --> Last edited by gerard488; 11-04-2011 at 08:44 PM.. Reason: spelling

11-05-2011, 10:40 AM	#2
Old Grump Advanced Senior Member Join Date: Feb 2010 Location: Little hut in the woods near Blue River Wisconsin Posts: 2,289	Re: 20Gauge shotgun slug .615 is the nominal size but it varies among manufacturers. If it's a Foster or Brenneke rifled slug don't worry about it, the only choke you have to worry about is super full choke, ie. turkey choke. If it's a little over size it will swage down harmlessly in your choke and if its a little undersize the full choke will help you shoot it more accurately. I have one on my desk in front of me and it only measures .610. I don't think my gun notices the difference. __________________ "When once a republic is corrupted, there is no possibility of remedying any of the growing evils but by removing the corruption and restoring its lost principles; every other correction is either useless or a new evil."~~- Thomas Jefferson Roman Catholic, Life Member of American Legion, VFW, Wisconsin Libertarian party, Wi-FORCE, WGO, NRA, JPFO, GOA, SAFand CCRKBA