breech seating bore diameter pp

[bruce moulds]

the opportunity arose today to shoot 300 metres at the fullbore club.
we shoot the same range twice, and I elected to shoot once with swiss 1f, and once with swiss 1.5f.
the 1f needed about 1 more moa on the staff than 1.5f, 85 gns of each.
both powders held similar vert, which was approx. 1 1/2 moa, shooting off cross sticks in the rain sometimes, and sun the rest of the time.
dropped 3 points the first range using 1.5, all being bad windcalls.
dropped 9 points using 1f, but this was in part not winding the sight up in order to compare elevation of the two powders.
both loads were capable of shooting a perfect score with a reasonable v count. (v is equivalent to the American x)
can we continue this as we go to longer ranges.
it was obvious that shooting on the open range makes accuracy harder to achieve than off a bench with sandbags.
part of the learning curve involved discovering logistical issues.
getting patched bullets to the firing line needs attention, as does protecting them from rain.
also getting charged cases to the line is an issue if the wads are not tight in the case mouths. I lost 2 wads and some powder from those cases, and it was lucky I had a few spares.
and it could be easy to forget to seat a projectile if you are more used to loading fixed ammo.
I have heard of this. it might be like crossfiring - there are those who have done it and those who will do it.
all in all the best vert I have shot, and a pbe score in one range.
adjustments of 1/2 moa are worthwhile for elevation to centre the group.
keep safe,
bruce.