You don't tell us what cartridge but I'll guess 45/70. Goex generally likes some compression. Up to .30" is not considered too much in this case. You must use  a compression die. Do not try to compress the powder with the bullet. I would go to .200 compression and try that. Then go up and down 2 grains. That should tell you which direction to proceed. Then go in 1 grain increments to find the best accuracy. Others may have different procedures.

What sights do you have one the rifle.  With a vernier & globe foresight, should be doing better than 5" @ 200.  If stock sights, just raise the charge up to 68 or 70grs

I'd add powder in 2gr increments until the groups stop tightening up.  Then try different primer types. Sometimes a primer can make a substantial difference with BP.

Edit:  fouling control (blow tube or wiping technique ) can really make a big difference too. Consistency is key with respect to bore condition and all else.

Chris.

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Believe, it's your reloads - again the powder charge.  Also, what is the neck tension on the bullet in the case and for best accuracy - slip fingered, not crimped.

As for the Pedersoli rifles, all their barrels are match grade bored at the factory.  I have 2, a 45-70 and a 45-90.  Here's one of the Pedersoli targets I kept.  That's 14 out of 25 bullets in the ragged hole:
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And here's what a Pedersoli will do at 1000 yds (10" center)
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Chris= Thanks for the vote of confidence...Maybe I am putting too much cheek presure on the stock as Boats mentioned...Gotta work on that...The crimp I put on is very slight..The bullet will still spin freely by hand..
I just need to get more range time in...I do not cast any more and all my bullets are from Chey and of 1 in20 alloy and ,458 diameter...I wonder if they aren't bumping up enough when fireing?
I slugged the barrel and got a measurement of .4585..Does this sound right?  John

If I had a .4585 I would want to be using .459.

I am a streaky shooter. I always say that. But my pedersoli was quite capable of 10's at 600 yds using the very same loading I told you in a different thread when you asked. the gun and that load out perform my abilities. I also won an over .40 bench match at a Schuetzen match with the same combo. ( admit there were only a handful of guys shooting that match but I still had to beat them.)
I was using swiss powder. 1.5f.  But I have never gone that thick on the over powder wad. .60 was the most I used. Keep at it. You seem close!!

Dogman said, "I aint gonna tell ya it is a Pedersoli sharps rifle..If I do you will say it aint no good."

Don't sell that Pedersoli short. It's quite capable of remarkable accuracy. Mine is their John Bodine Rolling Block with the 30" barrel. 69 grains of Goex Express 3F, a .030 Walters Wad and a Lyman Postell sized .459" in stretched Starline brass sized to give .002" neck tension will keep 'em all real close together at 100 meters. My best five shot 100 meter group with that load is .823". I suggest making or having made a chamber cast. Pedersoli 45-70 chambers are longer than the SAMMI specs and have a freebore. Matching case length to chamber length will enhance its performance. At this point though looking for the optimal powder charge will likely be your most productive option. Increase the powder charge in two grain increments as recommended without changing any other components of the load. Good luck.