Well, I got the darn Barnes 115 gr JBoos all patched up. Here's what is special about this batch:
Unlike the soft-core JBoos from last week, I did not roll them between files prior to putting on the PPatch;
I did a few with a 2X16# (white paper, shows pink below) patch, bringing them to 0.266". This may not provide enough "bite" for the lands; so
I did the rest with a 2X24# (green paper) patch, bringing them to 0.271", then ran them through a 0.269" lubrisizer die, just to be sure that they do not exceed the throating's 0.270" entry diameter.
The size-down proved easy, and there is still plenty of air left in the patch, so the pneumatic effect should not be harmed. The plan is to take them out to the range tomorrow and introduce them to the backstop. I'll stick with the sort of stout load that worked okay on the soft-core-PPJBoos last weekend, so should be at around 2800 fps.
IF the greenies will shoot at least okay, then I'll use the best load and run a group with the whities (thin patch) to see if a thinner patch works. Neither load will give full compression of the patch in the grooves. For full compression in the grooves, the whities will be 0.007" short of it, and the greenies 0.005" short. I know that air cannot travel far in the PPatch in the short time available in-barrel, but I am hoping the the greenies, and perhaps the whities also, will move enough gas sideways (both directions) from each landtop (which zone is subject to a MAAAAJOR cruching) to "pump up the tire" in the portion of the PPatch in the adjacent grooves. If so, then it will seal fine, as indicated by good grouping. If not, then not, in which patch blow-thru is likely and that may ruin accuracy. There's only one way to find out whether the raw liver will stick to the wall.
Zeek