Thompson Center Triumph Bone Collector Problem
#1
Spike
Thread Starter
Join Date: Jan 2015
Posts: 34
Thompson Center Triumph Bone Collector Problem
Hey guys, I'm shooting a T/c Bone collector with Barnes t ez 250 grain and harvester crush rib sabots(black), 100 grain of Pyrodex pellets and a Leupold ultimate slam scope.I'm having a hell of a time getting this thing sighted in. At 50 yards I'm dead center (3 shots) at 100 yards I'm all over the place high, low, left, right, everywhere! And I'm not talking by 2 or 3 inches I'm talking 6 or more! I'm using a lead sled so I know it's not me. Any suggestions what is going on? Scope and mounts are tight.
#2
Hey guys, I'm shooting a T/c Bone collector with Barnes t ez 250 grain and harvester crush rib sabots(black), 100 grain of Pyrodex pellets and a Leupold ultimate slam scope.I'm having a hell of a time getting this thing sighted in. At 50 yards I'm dead center (3 shots) at 100 yards I'm all over the place high, low, left, right, everywhere! And I'm not talking by 2 or 3 inches I'm talking 6 or more! I'm using a lead sled so I know it's not me. Any suggestions what is going on? Scope and mounts are tight.
Many shooters have moved completely away from pyrodex in T/C rifles and instead are shooting BH209, a much better propellant.
#5
What can happen........ if you have a sabot that may be too loose, the bullet and sabot spin at different rates or, the bullet may hardly spin at all. The sabot spins with the rifling, yet the bullet doesn't spin equally with the sabot, and that will certainly create a loss in your groups the further the distance. Bullets must be stabilized, which is what will give you the better groups. If the bullet is losing stabilization, you'll experience exactly what you're mentioning. In some instances, some target shooters will actually knurl bullets, which causes the bullet to grip inside the sabot, giving it stability.
Your TC will shoot BH209 very well with no modifications necessary. Learn about BH209 BEFORE you start shooting it. It has a MAXIMUM CHARGE OF 120GRS VOLUME AND NOT 150 as with other propellants. Most shooters find that 105 to 110grs by volume is the perfect charge in most rifles and manufacturers. http://www.blackhorn209.com/
I have a feeling, that if everything is correct with your rifle and scope, you're shooting it from a sled with proper shooting techniques, its most likely your sabot. Try shooting your bullets with the supplied sabots next round.
#6
Giant Nontypical
Join Date: Nov 2005
Posts: 6,585
Mine will do the same thing with crush -rib sabots I use the short black Harvester.
What I believe is that when the bullet is not gripped tight enough it does not spin fast enough and you get the same results as a smooth bore.
What I believe is that when the bullet is not gripped tight enough it does not spin fast enough and you get the same results as a smooth bore.
#8
Typical Buck
Join Date: Sep 2009
Location: Kansas
Posts: 921
I strongly suspect a loose sabot. Crushed Ribs are a great solution for a tight barrel and TC's do have a reputation for tight barrels. However, something is not right.
Are you swabbing between shots?
How much loading pressure do you have? You should have to give it a good push on a clean barrel.
Finally, clean that Pyro well. It shoots fine but is very corrosive and must be meticulously cleaned.
Are you swabbing between shots?
How much loading pressure do you have? You should have to give it a good push on a clean barrel.
Finally, clean that Pyro well. It shoots fine but is very corrosive and must be meticulously cleaned.
#9
Giant Nontypical
Join Date: Nov 2005
Posts: 6,585