Round bottom needs more patch to fill grooves with same ball dimension for me ,have a Kibler SMR and my TC Hawkens all use different patch thickness . The one thing they all have in common is each one is different !
Well stated.
There are, however some 'rules of thumb' we have found in over 40years of playing this game.
A ball .005" under bore size and a 10oz.(.022") denim patch, lubed with water-based or mink Oil or Neetsfoot oil shoots very well indeed, in square rifling.
With deep rounded rifling, you might find an 11oz. to 14oz. denim patch (Joanne's Fabrics) & a dead soft lead ball .010" under bore size will work better for you.
that is 11oz. to 14 oz. cloth, not .011" to .014".
Here are two separate barrels (actually the same barrel, but shortened 6" or so, for the second test), shooting loads we guessed at, simply knowing they would shoot decently
at the 50 yard range we used. This rifle was new to me & I've never shot it before. I do not like square notches with blade sights, but managed a couple good groups.
Sorry for the flyers. I usually manage to do that when shooting 5-shot groups. Incidentally, the length of pull for the first set of targets, was 17". YES. Taylor did a re-build thread
on this rifle in the building forum, some time back- March or April 2018(I think).
Even though there was some cutting and burning, the thin patch worked fairly well, accuracy wise.
The second test,(bottom 3 targets) were shot with reclaimed patches from my .69 rifle & were .034" thick. There was zero cutting or burning on them and they were reusable again. I used
them at Hefley this year, but probably should have used new patches. I only got a second place with them.