Marlin Firearms Forum banner
1 - 12 of 12 Posts

·
Premium Member
Joined
·
3,536 Posts
Mine slugged at .431. Now it is a rather long paperweight as I swapped it out for a 45 Colt..
 

·
Registered
Joined
·
24 Posts
got it slugged when i bought it. two slugs one at .429 the other at .430 so i guess it is right around where it is supposed to be?
 

·
Premium Member
Joined
·
8,169 Posts
Mine slugged out at 0.430" nominally. I shoot 0.432" sized cast bullets and am quite happy with that arrangement.
 

·
Registered
Joined
·
26 Posts
I bought my Marlin 24'' Cowboy secondhand and it was shooting terrible groups, slugged the barrel.433 must have been made on a Monday morning at Marlin.(very disappointing that they let them out with such an over bore)
Imported a Green mountain 27'' octagon .430 groove with a 1 in 36'' twist and now it shoots like a benchrest rifle.
My Cowboy now sports a 26'' octagon barrel without the rear sight dovetail cut, as I only like to use peep sights.
The Green Mountain barrel is very well made. I put about a 150 lead bullets through it and about thirty jacketed and no sign of copper fouling.I wish Green Mountain would make a .308 octagon barrel blank.
regards Dallas
 

·
Registered
Joined
·
206 Posts
I'm not familular with this slugging. Could someone explan it and how do you go about doing it. Are there special tools required too.

Also, Nicknack i love what you've done with that cowboy. Whom did you get that Green mountain barrel from? It's been hard finding one of those 24" cowboy models i thought of getting a barrel and slapping on an action just like you. Could you send info in a PM
 

·
Premium Member
Joined
·
2,295 Posts
Slugging is a procedure wherein you drive a soft lead egg sinker or muzzle loader ball down the bore to obtain a groove diameter measurement. Groove diameter and whether or not there are tight points in the bore (under the roll marks for instance) is important information for cast bullet shooters. Doesn't matter much for jacketed bullets...

ETA: Run a patch with light oil down the bore. Start the slug into the muzzle with a non marring hammer. Then push the slug through the bore with an aluminum or brass rod as close to bore diameter as possible. Short blows with a heavy hammer are better than fast blows with a light hammer. While driving the slug, note areas of tightness along the bore.

Many folks recommend using a hardwood dowel to drive the slug through the bore, but you don't have to look very hard to find horror stories of broken dowels wedged hopelessly in the barrel. If you do use a dowel be careful. If it breaks STOP! You cannot hit a broken dowel a little harder and get it out.
 

·
Premium Member
Joined
·
3,536 Posts
I went over to the steel yard and bought a 3' piece of 3/8 aluminum rod for a couple bucks. Works great for slugging...
As for egg sinkers and why they are better, supposedly the hole down the center gives the lead that gets squeezed a place to expand into which helps eliminate any potential spring back of the slug once it exits the barrel. Whether that is true or not is arguable but they do work great and are easy to find in the fishing section. If you see any new Marlins on the racks as you walk by try not to look!
Here is a link that shows what size sinkers you will need...
Also make sure you can dent the lead with your fingernail before you buy, supposedly there is one brand that has zink or some such in it and wont work at all.
http://www.marlinowners.com/forums/index.php/topic,69736.msg687223.html#new
 

·
Registered
Joined
·
206 Posts
Thanks for the explanation. I will get me some of those sinkers and slug my barrels and report my findings.
 

·
Registered
Joined
·
26 Posts
JEB308 don't know if you got my email on octagon barrels.
You can get Green mountain barrels from Track of the Wolf
http://www.trackofthewolf.com/Categ...yleID=1239&AspxAutoDetectCookieSupport=1&as=1
they are very good at sending overseas to Australia,so you will have no worries getting them to yourself in the states.

Or you can get barrels direct from Green Mountain but they seem to be cheaper from Track of the Wolf

http://www.gmriflebarrel.com/catalog.aspx?catid=pistolcalibercenterfirebarrels

http://www.gmriflebarrel.com/catalog.aspx?catid=classictaperedoctagon

They are listed as 44-40 but the twist rate 1 in 26'' is faster than Marlins 1 in 28'' I don't know why they list it as a 44-40 as the bore size for a 44-40 is usually .427 and they have made there's .430 even .429 would have been better.
These barrels shoot the Hornady .430 240 grain XTP very well. I haven't tried a .429 bullet yet but they will probably squeeze up a thousand of a inch bigger.
Or you can get a .357 octagon barrel but the twist rate is a little slow at 1 in 20'' but i don't think it will worry bullets up to 158 grain
They used to make a 25-20 in octagon but is now only available in round.
regards Dallas
 
1 - 12 of 12 Posts
Top