Thompson Center Impact Sighting Issue

K

KRASHED

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Not sure if this is the correct forum so move if I'm wrong.

Took my brand new thompson center impact muzzleloader (modern) out to our range to make sure it was sighted in properly. To my amazement, and my dads, it was shooting way too high at 30yrds and off the charts at 50yrds. Now we're pretty sure we understand the concept of iron sights and our back sight was as low as it could possibly go. (if we are wrong with this then this is our problem)

We also tried differing load combinations between 1-2 pucks of pyrodex. There was nothing wrong with our groupings so it isn't a loading improperly issue as far as I know.

Any help would be appreciated. Need to know whether this sucker needs to go back. I have no interest in mounted a scope also.
 
Faster loads often shoot to a lower point on the target. It's counter intuiative but I just went thru this with my TC in 45-70. Loose powder is more flexible and you may have to change both your bullet and charge weights.

If that doesn't work for you, this formula can be used to figure out how much more or less front sight height is needed.

sight radius x distance up or down needed on the target
distance to the target
 
Light loads = lower velocity = more barrel time = shooting higher.

One pellet of pyrodex seems way too little, but two pellets should not print that high. Lots of good hunting loads use two pellets. If your rear sight is all the way down, you may have to replace your front sight with a higher one to lower your point of impact.
 
If your rear sight is all the way down, you may have to replace your front sight with a higher one to lower your point of impact.
Click to expand...
That's what the formula I gave above is for - to know how much higher a front sight is needed. It works.
 
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