swiss  1.5 powder   42 grains.  lyman postel bullet  .380 diam.  compress  .125  and set overall length to have bullet just touch rifling.  art ruggiero  an italian american

Art, what kind of accuracy do you get with that 335 grain bullet with the Uberti's relatively slow twist?

Valerio,

I suggest that you slug your barrel (drive a soft lead ball, slightly larger than the groove diameter a couple of cm into the barrel with a wooden or plastic hammer and a short piece of dowel, then drive it back out and measure the biggest diameter across the groove impressions that stand up larger than the rifling land impressions. You can also slug the chamber end of the rifling to see if the bore is uniform from back to front.) to determine the groove diameter.  Use a bullet that is .001 to .002 inch ( .025 to .060 mm) larger in diameter than the groove diameter of your barrel.

If you are only shooting out to 200 meters, you could get away with a lighter bullet, say 250 grains, with a flat nose. One with a rounded nose will hold its velocity better, though.

the pedersolis are 12 twist,  it shoots 1.5 min o a at 200 yds  art

Quote:

Accurate Mold, 38-320E, clone of the Ideal 375166, in a 1:18 twist bore shooting black powder - 42gr 1.5Fg or FFg is accurate to 600 meters ...
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This is my Go-To bullet, 1:16 alloy in my Uberti HiWall
Paper target accuracy with vernier rear sight & globe front: 100and200yds ... both less than MOA
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valerio - It is my understanding that Accurate Molds will ship internationally.  Send them an email - 
tom@accuratemolds.com 
And yes the 375166 bullet is accurate at 100 - 200 - 300 - 400 and 500 meters using 42gr of black powder.  If you for some reason don't want this mold, go to the website and pick a 38-55 mold that you would desire.  There are many designs and weights
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My first foray into single-shot ASSRA shooting was a .38-55 Remington Rolling Block with an 18" twist barrel. I learned many things with this rifle. The rifle was built up from the military action with straight grip stock and Unertl mounts for an external adjustment scope. The trigger pull was 3.5 pounds, but crisp.

The first lesson was the tiring effects of recoil. I had access to molds up to 325 grains and these heavier bullets would belt you and tire you after a full day's match or practice session at the range. Shooting only to 200 yards, I went down the weight scale and settled on the 250 grain range of bullets. 

The SAECO #738 and a modified RCBS 375-250-FN mold with the gas-check shank removed shot the best. This was with both smokeless and black powder. Softer alloy and lubricant for black powder with wheel-weight alloy and Javelina NRA lubricant for smokeless were the choices. This rifle was a true learning experience and sharpened my interest in Schuetzen, but it was never competitive. (I now have a ..32-20 Stevens 44 1/2 which has far more potential.) 

I recommend you start in this weight range and then work the bullet weight up once you have gained knowledge and confidence in the rifle.   These rifles have the potential to be very accurate,but like all rifles, need time and experimenting with loads to find their true potential. 

The problem with the Rolling Block was the rifle would shoot well one day and "improved cylinder" the next day. The rifle was turned into a.45-70 Sporter and the .38-55 barrel was put on a Marlin 93 for elk hunting. The Marlin 93 was dependably accurate and accounted for several Idaho elk.