Cast 45/70s in Micro-groove

Drm50 · December 7, 2014, 05:54 PM

I have several 458 moulds, one being 330 Gould express hp. I have shot a lot
of these out of various single shots including Ruger #1. All gave good results.
I was going to load up some for Marlin 1895, that is 1970s manf. My buddies tell
me micro- groove will not shot cast and will lead barrel. Anybody up on this?

bigarm · December 7, 2014, 09:18 PM

Go to cast boolits. There are plenty of people using cast bullets in Marlins with micro groove barrels.

flashhole · December 8, 2014, 07:58 AM

I want to follow your thread.

I see no reason for the assertions related to excessive leading. You need to get the proper alloy and bullet diameter.

Did you slug your bore?

What is the diameter of the bullets as they drop from your mold?

Have you looked into bullet uniformers/sizers from Lee Precision?

My thinking is you will likely be using a harder alloy bullet that is .001" larger than your bore for best accuracy and minimal leading. Just don't push them excessively fast. I shoot my own cast bullets in my Guide Gun with great success but I don't have microgroove rifling.

Bigarm is correct, a wealth of knowledge on Cast Boolits and the guys are always willing to help.

LivewireBlanco · December 8, 2014, 11:17 AM

There was an issue of Handloader Magazine a few months ago that touched on this subject. I can't remember all they said but I do remember that it could be done but they went .002" larger on the bullet than bore diameter. I can look it up for you if you'd like.

flashhole · December 8, 2014, 04:35 PM

DRM50 - Just curious, which is your favorite 45-70? I'm trying to convince myself I need another one so my lever gun won't feel lonely.

res45 · December 8, 2014, 06:43 PM

Shooting cast in Marlin Microgroove Barrels.

http://www.lasc.us/FryxellMarlin-MicroGroove.htm

Salmoneye · December 8, 2014, 06:51 PM

Quote:

I do remember that it could be done but they went .002" larger on the bullet than bore diameter.

Larger than groove diameter...

flashhole · December 10, 2014, 07:05 AM

res45 - that is a good article, thanks for sharing.

Drm50 · December 10, 2014, 08:16 PM

Remington rolling block. Action off a smokeless model, Douglas barrel 30"
hi-tang sight. Restocked. Shoot all cast 20/1 lead tin. 1350 fps. 405 gr
2nd. Favorite. Ruger #1. 300 gr. Jhp. IMR 3031. 58 gr. 2150 fps

Shoot old guns with softer bullets, at 1200-1350, sized .459"

December 8, 2014, 07:58 AM	#3
flashhole Senior Member Join Date: February 9, 2005 Location: Owego, NY Posts: 2,000	I want to follow your thread. I see no reason for the assertions related to excessive leading. You need to get the proper alloy and bullet diameter. Did you slug your bore? What is the diameter of the bullets as they drop from your mold? Have you looked into bullet uniformers/sizers from Lee Precision? My thinking is you will likely be using a harder alloy bullet that is .001" larger than your bore for best accuracy and minimal leading. Just don't push them excessively fast. I shoot my own cast bullets in my Guide Gun with great success but I don't have microgroove rifling. Bigarm is correct, a wealth of knowledge on Cast Boolits and the guys are always willing to help. __________________ ,,, stupidity comes to some people very easily. 8/22/2017 my wife in a discussion about Liberals. Are you ready for civil war?

December 8, 2014, 04:35 PM	#5
flashhole Senior Member Join Date: February 9, 2005 Location: Owego, NY Posts: 2,000	DRM50 - Just curious, which is your favorite 45-70? I'm trying to convince myself I need another one so my lever gun won't feel lonely. __________________ ,,, stupidity comes to some people very easily. 8/22/2017 my wife in a discussion about Liberals. Are you ready for civil war?

December 10, 2014, 07:05 AM	#8
flashhole Senior Member Join Date: February 9, 2005 Location: Owego, NY Posts: 2,000	res45 - that is a good article, thanks for sharing. __________________ ,,, stupidity comes to some people very easily. 8/22/2017 my wife in a discussion about Liberals. Are you ready for civil war?

December 10, 2014, 08:16 PM	#9
Drm50 Senior Member Join Date: November 10, 2014 Posts: 1,376	45/70 favorite Remington rolling block. Action off a smokeless model, Douglas barrel 30" hi-tang sight. Restocked. Shoot all cast 20/1 lead tin. 1350 fps. 405 gr 2nd. Favorite. Ruger #1. 300 gr. Jhp. IMR 3031. 58 gr. 2150 fps Shoot old guns with softer bullets, at 1200-1350, sized .459"

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December 7, 2014, 05:54 PM	#1
Drm50 Senior Member Join Date: November 10, 2014 Posts: 1,376	Cast 45/70s in Micro-groove I have several 458 moulds, one being 330 Gould express hp. I have shot a lot of these out of various single shots including Ruger #1. All gave good results. I was going to load up some for Marlin 1895, that is 1970s manf. My buddies tell me micro- groove will not shot cast and will lead barrel. Anybody up on this?

December 7, 2014, 09:18 PM	#2
bigarm Member Join Date: November 4, 2012 Posts: 65	Go to cast boolits. There are plenty of people using cast bullets in Marlins with micro groove barrels.

December 8, 2014, 11:17 AM	#4
LivewireBlanco Member Join Date: September 19, 2012 Location: West Texas Posts: 64	There was an issue of Handloader Magazine a few months ago that touched on this subject. I can't remember all they said but I do remember that it could be done but they went .002" larger on the bullet than bore diameter. I can look it up for you if you'd like.

December 8, 2014, 06:43 PM	#6
res45 Senior Member Join Date: September 15, 2007 Location: NC Posts: 753	Shooting cast in Marlin Microgroove Barrels. http://www.lasc.us/FryxellMarlin-MicroGroove.htm