Help with my muzzleloader
 

I got a TC Prohunter FX. I am using 245 grain powerbelt with 100 grains Triple 7 powder.

It shoots 4" high at 50 yards with good groups and over the target (at least 8") high at 100 yards.

The rear sight won't go any lower.

Do I need a heavier load or less powder?

So let me get this right, your 4 inches high at 50, assuming your target is 8.5x11 and you are approximately 8 inches OVER the target that means you are approximately 12 inches high at 100. Something there aint adding up in my math brain. Unless you are shooting up or down hill at a pretty good angle at one and vertical on the other that is pretty near impossible to accomplish given that you are sighting properly in your sites and you are seating your bullet the same with the same powder.

Not impossible with a T/C. The bore is probably not cut in the center of the barrel (many aren't), so it doesn't go the direction it should to start with.

Your load is not the problem. Something about your sights is.

First of all, with any open sight system, I use the "6 o'clock" hold. In other words, I put the top of the target on the bottom of the bullseye. That lowers your point of impact (POI) a little.

Secondly, you have two other choices to lower your POI: Lower the rear sight or raise the front.

So if the rear sight is as low as it will go, they you have to raise the front sight. In other words, order a taller one.

First thing I'd do, would be to make sinkers out of the powerbelts and shoot a higher quality bullet.

The simple answer if you are using iron sights is that your front sight is too tall. If it were me I would shave of the sight [front] a bit at a time until the trajectory matched the sights. This is what we do if we build one.
Also BA is right about losing the PB. That particular PB cost me a buck by blowing up and not penetrating, The only PB I would use if I could not get anything else are the 350 grain and heavier.

If I am reading this correctly, you gun is grouping to your satisfaction. Therefore, you are consistent and it is simply a matter of bring the group on target and therefore accurate. I will not get into a Powerbelt discussion here as that was not your question.

I think we need to get on the same page as a forum. TXHUNTER says raise the front sight, while LEMOYNE says shave it down. My thought process is that the bullets travel in a parabolic path crossing your line of sight twice. In this case, the bullt has already crossed the line of sight prior to 50 yards (4" high) and continues upward at 100 yards. It obviously has to decend and re-cross the sight plane at some distance, which is unknown at this time. The solution to me would be to bring the line of sight more inline with the bullets parabolic path. In a crude sketch, it would seem that raising the front sight would bring your line of sight more inline with the trajectory.

All of my rifles are scoped, so I could be off base. The iron sight experts here will offer great advice.

Move the rear sight whichever direction you want the bullet to go. Do the opposite with the front sight.

if you are shooting on somewhat flat land at both 50 and 100 yards and already checked for tightness of your front and rear sights.....
......You need to contact T/C, if and when it's determined that you are seating the bullet firmly and the exact same way every time you load the powder and bullet.

You need to contact T/C, if and when it's determined that a 2nd choice sabot/bullet of roughly 240 grains is doing approx the same thing. T/C will want this additional proof that the ML could be at fault and not the powder choice or bullet choice.

Also, try the 50 and 100 yard testing using 90 grains. See how much the compensation on target paper is in inches. Then document that and use both 100 grain and 90 grain evaluations in discussion with the T/C rep over the phone.

It may just be a matter of getting a higher front sight.

Give this a try. http://www.huntingnet.com/forum/blac...-how-high.html

Assuming your groups are good, this seems like the best advice. It may mean you need a new front or rear site (I had to with my Omega, got it free from TC) but that's better IMO, than messing with the amount of powder.