54 problems

[kiph]

I have a Thompson Center 54 ca. black powder rifle. It does not have the word Renegade on the barrel. No matter what powder charge I use, round ball or maxi ball, rear sight adjustment up or down, it will shoot all consistently high 12 inches or better from a sand bagged rest using a six oclock hold at 50 yards. Pyrodex 2fg powder
from 50 gr to 90 gr. I am ready to use this as a boat anchor considering I have 2 other T/C rifles in 45 and 50 who print consistent 2 inch groups at 50 yards all day long. Someone please give me a solution.

 

[Celt5494]

Oh, I thought you had "54" problems so I came in to see all of them. Glad it's just narrowed down to one!

 

[Loyalist Dave]

I have a Thompson Center 54 ca. black powder rifle. It does not have the word Renegade on the barrel. No matter what powder charge I use, round ball or maxi ball, rear sight adjustment up or down, it will shoot all consistently high 12 inches or better from a sand bagged rest using a six oclock hold at 50 yards. Pyrodex 2fg powder
from 50 gr to 90 gr. I am ready to use this as a boat anchor considering I have 2 other T/C rifles in 45 and 50 who print consistent 2 inch groups at 50 yards all day long. Someone please give me a solution.

Lots of questions then
Does it group, and it's just that the group is 12" high, or does it scatter shots and they all are 12" high?
Are you using round ball?
If you are using round ball, have you recovered and examined any of the patches? Can we see photos of them please?
Did the rifle start doing this behavior over time, OR did you obtain this rifle and found it shoots this way?
Has this rifle been coned?
Have you examined the crown at the muzzle?

LD

 

[Newly O’Brian]

A thought, are you placing the sand bag under the forearm or under the barrel and forcing it up?

 

[Indy Durtdigger]

To go with the barrel stuff Loyalist Dave brought up, how does it fit the stock? I.E. the hooked breach, is it hitting the lock, does it take any pressure to seat it? Usually, TC stuff is drop in and go but sometimes a stinker shows up or one someone else messed one up before passing their handiwork along.

 

[Newly O’Brian]

80 grs is a common pet load for prb 54s

 

[Eric Krewson]

I had an un-shot TC Tree Hawk that I bought at a flea market for $90 that shot high like that but grouped well, I ordered a taller sight for it from Midway USA and brough it back into line, the TALL sight looked odd but gave me a full adjustment range on the rear sight.