15 bore shotgun

roadrocket · March 10, 2010, 01:10 PM

hi i have a 15 bore muzzle loader shotgun can anyone tell me what powder charge to use it is a percussion gun.

arcticap · March 10, 2010, 01:46 PM

The general rule of thumb is that the starting load is equal to the caliber of the bore in volumetric grains of powder.
Since 15 gauge has a .677 bore then it's safe to begin with a minimum charge of 68 grains of powder with an equal amount of shot.
In reality you can go up quite a bit in shot and powder load.

POWDER MEASURE SETTINGS TO
MEASURE OUT OUNCES OF BIRD SHOT
50 grain setting = 3/4 ounce of shot
60 grain setting = 7/8 ounce of shot
70 grain setting = 1 once of shot
80 grain setting = 1 1/8 ounce of shot
90 grain setting = 1 1/4 ounce of shot
100 grain setting = 1 3/8 ounce of shot
110 grain setting = 1 1/2 ounce of shot
120 grain setting = 1 5/8 ounce of shot

Here are some equal volume type loads:
oz. shot-----Dr. powder-------Grains
3/4-------------2--------------55
7/8-------------2 1/4----------62
1---------------2 1/2----------68
1 1/8-----------2 3/4----------75
1 1/4-----------3--------------82
1 3/8-----------3 1/4----------89
1 1/2-----------3 1/2----------96
1 5/8-----------3 3/4----------102
1 3/4-----------4--------------109
1 7/8-----------4 1/4----------116
2---------------4 1/2----------123
2 1/8-----------4 3/4----------130
2 1/4-----------5--------------137

More info. about shotgun loads:

http://www.circlefly.com/html/muzzleloaders.html

http://members.aye.net/~bspen/starr.html

darkgael · March 10, 2010, 04:59 PM

Arctic: Thanks. That is a very nice compilation of data. Very useful.
Pete

roadrocket · March 11, 2010, 12:30 PM

thank for the info i have been using 60 gr and it seemed quite happy with it i think i wont go any higher as it is dammascuus barreled.

March 10, 2010, 01:10 PM	#1
roadrocket Member Join Date: September 17, 2007 Posts: 72	15 bore shotgun hi i have a 15 bore muzzle loader shotgun can anyone tell me what powder charge to use it is a percussion gun.

March 10, 2010, 01:46 PM	#2
arcticap Senior Member Join Date: March 15, 2005 Location: Central Connecticut Posts: 3,166	The general rule of thumb is that the starting load is equal to the caliber of the bore in volumetric grains of powder. Since 15 gauge has a .677 bore then it's safe to begin with a minimum charge of 68 grains of powder with an equal amount of shot. In reality you can go up quite a bit in shot and powder load. POWDER MEASURE SETTINGS TO MEASURE OUT OUNCES OF BIRD SHOT 50 grain setting = 3/4 ounce of shot 60 grain setting = 7/8 ounce of shot 70 grain setting = 1 once of shot 80 grain setting = 1 1/8 ounce of shot 90 grain setting = 1 1/4 ounce of shot 100 grain setting = 1 3/8 ounce of shot 110 grain setting = 1 1/2 ounce of shot 120 grain setting = 1 5/8 ounce of shot Here are some equal volume type loads: oz. shot-----Dr. powder-------Grains 3/4-------------2--------------55 7/8-------------2 1/4----------62 1---------------2 1/2----------68 1 1/8-----------2 3/4----------75 1 1/4-----------3--------------82 1 3/8-----------3 1/4----------89 1 1/2-----------3 1/2----------96 1 5/8-----------3 3/4----------102 1 3/4-----------4--------------109 1 7/8-----------4 1/4----------116 2---------------4 1/2----------123 2 1/8-----------4 3/4----------130 2 1/4-----------5--------------137 More info. about shotgun loads: http://www.circlefly.com/html/muzzleloaders.html http://members.aye.net/~bspen/starr.html Last edited by arcticap; March 10, 2010 at 01:54 PM.

March 10, 2010, 04:59 PM	#3
darkgael Senior Member Join Date: February 9, 2006 Location: Homes in Brooklyn, NY and in Pennsylvania. Posts: 5,473	Thanks Arctic: Thanks. That is a very nice compilation of data. Very useful. Pete __________________ “Auto racing, bull fighting, and mountain climbing are the only real sports ... all others are games.” Ernest Hemingway ... NRA Life Member

March 11, 2010, 12:30 PM	#4
roadrocket Member Join Date: September 17, 2007 Posts: 72	15 bore thank for the info i have been using 60 gr and it seemed quite happy with it i think i wont go any higher as it is dammascuus barreled.