Need a load for 539gr. cast bullets in 45/70

Lead Man · June 17, 2012, 04:42 PM

I am attempting to work up a load for a Cimmarron Quigley 45/70. I have already slugged the bore to stop the Key Holing. Now I want to load some heavies for hog hunting this fall. A couple of suggestions have been to go with he Lyman cast book for the 500gr. trapdoor for safety sake. Anybody got a better idea or proven load for he 539gr. cast?

mehavey · June 18, 2012, 06:43 PM

- Who makes the 539gr bullet (or whose mould is it)

FWIW:

My Marlin Guide Gun takes the following:
1895MarlinGBL 45-70
RCBS 45-500FNGC Cast(Lyman#2-ish) (510.5gr actual)
Size 459" (we can hope)
IMR3031/38.5**
BR2 primer
StarLine Brass*
OAL:2.530" (crimp groove)
QuickLoad PREDICTS 21,553psi/1,371fps (18.5" barrel)
ACTUAL Velocity (Oehler35) = 1,374fps±10 (yes, ...ten)

*(QuickLoad equiv-CaseVol=85.5gr H20)
**Full Case/HvyCrimp (RCBS roll crimp ½-turn past first case mouth contact)

The handloader speaks and says: For an increase in bullet weight to 539gr, QL predicts pressure ~ 22,865psi and ~1,530fps out of a 34" Quigley-type barrel.

The Lawyer speaks to say: YMMV. Consider starting two grains lower.

The shoulder says: This is a stout load even out of a heavy Sharps. "Ouch"

PawPaw · June 18, 2012, 06:49 PM

For a bullet that size, I use 3.4cc of 777 , a wax cookie between the bullet and the powder and get 1" groups at 100 yards. I'm using a Lyman globe sight on the front.

That ought to lay down any hog in existence.

mehavey · June 18, 2012, 07:07 PM

Alternately, you can go to the 45-70 classic: Accurate 5744
A5744 is one powder that does not object to low fill ratios.

I suggest starting at 24.5gr under the 539 cast bullet you mentioned for a low 1,300-ish velocity (34" barrel again)
which will have very low velocity spread.

See: http://www.accuratepowder.com/wp-con...d_data_3.5.pdf

June 17, 2012, 04:42 PM	#1
Lead Man Junior Member Join Date: June 15, 2012 Location: Cattle Ranch Western Missouri Posts: 3	Need a load for 539gr. cast bullets in 45/70 I am attempting to work up a load for a Cimmarron Quigley 45/70. I have already slugged the bore to stop the Key Holing. Now I want to load some heavies for hog hunting this fall. A couple of suggestions have been to go with he Lyman cast book for the 500gr. trapdoor for safety sake. Anybody got a better idea or proven load for he 539gr. cast?

June 18, 2012, 06:49 PM	#3
PawPaw Senior Member Join Date: December 24, 2010 Location: Central Louisiana Posts: 3,137	For a bullet that size, I use 3.4cc of 777 , a wax cookie between the bullet and the powder and get 1" groups at 100 yards. I'm using a Lyman globe sight on the front. That ought to lay down any hog in existence. __________________ Dennis Dezendorf http://pawpawshouse.blogspot.com

June 18, 2012, 06:43 PM	#2
mehavey Senior Member Join Date: June 17, 2010 Location: Virginia Posts: 6,894	- Who makes the 539gr bullet (or whose mould is it) FWIW: My Marlin Guide Gun takes the following: 1895MarlinGBL 45-70 RCBS 45-500FNGC Cast(Lyman#2-ish) (510.5gr actual) Size 459" (we can hope) IMR3031/38.5** BR2 primer StarLine Brass* OAL:2.530" (crimp groove) QuickLoad PREDICTS 21,553psi/1,371fps (18.5" barrel) ACTUAL Velocity (Oehler35) = 1,374fps±10 (yes, ...ten) (QuickLoad equiv-CaseVol=85.5gr H20) Full Case/HvyCrimp (RCBS roll crimp ½-turn past first case mouth contact) The handloader speaks and says: For an increase in bullet weight to 539gr, QL predicts pressure ~ 22,865psi and ~1,530fps out of a 34" Quigley-type barrel. The Lawyer speaks to say: YMMV. Consider starting two grains lower. The shoulder says: This is a stout load even out of a heavy Sharps. "Ouch" Last edited by mehavey; June 18, 2012 at 06:51 PM.*

June 18, 2012, 07:07 PM	#4
mehavey Senior Member Join Date: June 17, 2010 Location: Virginia Posts: 6,894	Alternately, you can go to the 45-70 classic: Accurate 5744 A5744 is one powder that does not object to low fill ratios. I suggest starting at 24.5gr under the 539 cast bullet you mentioned for a low 1,300-ish velocity (34" barrel again) which will have very low velocity spread. See: http://www.accuratepowder.com/wp-con...d_data_3.5.pdf