I need advice from the pros here.. I bought a Pedersoli Sharpes "Boss" gun from a distributor in Alberta last December and I have diligently been working on a load for my rifle. Here is my conundrum. The barrel is 34" in length and the twist rate is 1/18".
When I bought this rifle, I asked what bullet would be best for this barrel and twist rate? The gent who sold me this rifle also sold me what I think is a Lyman 500 gn boolit mold and told me that this would be the most accurate with this barrel. Ok, so I dished out the cash and now I'm casting 500 gn Lyman spitzer type boolets for my rifle.
When I bought the rifle, I asked for a Soule long range tang site so that I might at some future time, compete at long ranges with the big boys.
The rifle has a mid barrel site that is graduated in 100 yard increments starting at 200 and going to 800. When I use this site, my groups are tight 1-1/2" using 53 gns of pyrodex RS but with this site at 100, my groups are 12" low!!
What am I doing wrong here? Shouldn't my Mean point of impact be high?? Am I supposed to use a lighter boolet?
What, I wonder, would this mid range barrel site be calibrated for?
Today I read in Paul A. Matthiews book, " Loading the Black Powder Cartridge" that he says that 56 gns of Pyrodex RS is equivalent to 70 gns of black powder, so I loaded up 20 rounds for testing at the range next time I go out.
I'm wondering if the Boolit weight is too heavy for the rifle in that it should be close to what the site is set for and not 12" low at 100 yards. Can anyone help a newbee out??
cheers mates..
Guy