Leading near the muzzle?

[Beaverhunter2]

I was shooting my .30-30 24F today testing loads with the Lee 113gr Soupcan and the RCBS 180gr FN. The bore is a very consistent .308" G-G and is 24" long. The boolits were sized at .309". The first set of groups were all around an inch at 50 yards. :-D Then things went downhill. :-( I checked the barrel and found leading building up in the last 4-5" of the barrel. I saw a post some time ago that suggested that this was due to the lube "running out".

Can anyone shed more light on this situation and how to deal with it? I can't make the lube grooves any bigger so I hope a different lube might help. The boolits were lubed with homemade SAECO green (recipe from the "lubes"thread).

Thanks for any help!

John

[mooman76]

Thats what it usually means. You need a better lube. If it's home made you prabubly just need to add something to the lube to make it last a little longer. I don't make my own and don't use speed green so I'm not much help there.

[waksupi]

I believe I would try adding some lanolin to the mix.

[rmb721]

Try Carnauba Red high speed lube from "lar45" on this forum.

I use the RCBS 180-FN in my Marlin 336 with 24 inch barrel with 19 grains of IMR-4227.
Absolutely no leading at all. My alloy is eight pounds of WW and one pound of linotype.

[Shiloh]

Your running out of lube.

I use the BAC from lar45 http://www.lsstuff.com/lube/

I have shot at 2100 with no leading in .30 cal. Better accuracy at 1600-1650.
I get a nice lube star on the muzzle and no leading at all.

Great Lube, Great Price!!

Shiloh