Here is an update on my progress with the Whitworth. It’s been a fortnight until I could get back to the range because I have to coordinate a day off work with a day the range is open for practicing.
I’m having to aim about 5-6 inches low at 50 meters and I‘m only using the standard ladder sight as I’m still saving up for good target peep sights. I’m also using ordinary #11 caps which is a relief to me as musket caps are damn hard to find but #11 caps are plentiful. I never had any ignition problems and could perceive no difference between them and musket caps.
I weighed out 20 vials of Wano PP (more consistent granules size of ffg) in 65gr, 70gr, 75gr and 80gr.
I weighed 40 projectiles within one grain of each other and patched 20 with onion skin 9lb paper and the other 20 in a tissue like tracing paper I had laying around. I used saturated greased felt wad between powder and bullet and wiped between shots. I set up a target at 50 metres and tried to get the best group size from each powder charge using a stable rest. I was very mindful of doing everything just the same way every time I loaded. The only variable was the different powder charges.
First 5 shots with 65 grains scored 9/7/9/9/8
Next 5 shots were with 70gr and scored a bit worse 8/6/8/7/6
I kept the same point of aim for those two strings, a 6’oclock hold with the front sight post just under the black ‘7’ ring.
My next string was with 75gr using a dead centre hold on the bullseye. Remember I’m going for group size and not a score. 2/3/2/0/2
I got a similar grouping to what I got with 65gr but the 75gr charge raised the impact over 8 inches high from the point of aim.
I was about to try the 80gr charge when out of nowhere a rainstorm hit. And I mean a storm! Wow! It was a lovely warm calm early spring morning so I was lightly dressed. I got soaked in freezing rain and decided I would stop for the day.
I didn’t get a chance to try the 80gr powder charge. I want to set up a target at 100 metres next range day but I will likely be another fortnight before I can go.
Anyway, those of you with more experience than I, please advise me how to proceed from here. I think my main learning experience is that the 65gr charge is worth further exploration and that the onion skin paper has given the best results so far.