I've been loading up the Extreme 124 gr RN at 1.125 COAL, using both 4.2 gr HP-38 and 4.3 gr, with WSPP. Have shot a couple of hundred of each, and went ahead and loaded up the remainder of the 1,000 extreme bullets I purchased, 400 using 4.3 gr, and 300 with 4.2 gr:
extreme_124gr_stockpile by
baldrage, on Flickr
extreme 124 gr by
baldrage, on Flickr
My plan is to finish shooting off this batch, then go back and look at my targets to see if one load was more accurate than the other. Based on the results, I'll pick either 4.2 gr HP-38 or 4.3 gr as my "standard" Extreme load.
Going by the empty WSPP boxes, I've now loaded 1,600 rounds in my short career as a reloader. Still a newb, but at least my technique is improving (getting only about 1 primer not fully seated every two hundred rounds or so, and my QC process catches it when I do). I'm able to crank out 200 rounds in 90 minutes on my SDB, working at a methodical, steady pace, and that includes getting all the components out of storage, getting everything set up, loading the rounds, then putting everything away again.
It will take me a while to use up the Extreme rounds I have loaded, so thought I would try out the sample packs of Blue Bullets 125 gr LRN (250 rounds) and Rocky Mountain Reloading 124 gr plated RN (500 rounds). Appreciate a sanity check from the tribal elders before I make up my initial test ladders ...
Plunk testing with dummy rounds and my empty SP01 Shadow barrel revealed that 1.128 COAL for the Blue Bullets would plunk, but not spin or fall out of the barrel without a little assistance. 1.125 COAL would plunk, spin, and fall out with no issues. So, subtracting standard .015 off-set gives me a nominal COAL for my barrel of 1.110. Looking at Hodgdon's load data for HP-38, they show starting load of 3.9 gr and max load of 4.4 gr for 125 gr LCN (no brand listed). Since I don't know which brand of bullet they used, I can't hazard a guess as to bullet length compared to my Blue Bullets. Therefore, because my COAL is shorter, I should shift the load window down, correct? Starting load of 3.8 gr HP-38 and max load of 4.3 gr make sense?
Similarly, plunk testing the RMR 124 gr plated RN revealed 1.141 COAL would plunk, spin, and fall out, so I subtract .015 off-set, and get a nominal COAL of 1.125, same as I have been using for the Extreme 124 gr plated RN. These RMR bullets are .584 in length (based on average of 5 randomly-selected bullets), compared to .583 for the Extreme, so .001 longer (is "smidge" or "skosh" the correct terminology for measurements of one one-thousandth of an inch). Hodgdon data has 1.150 COAL for Berry's 124 gr HBRN TP, with starting load of 3.9 gr and max load of 4.4 gr HP-38. Per previous discussion in this thread, I understand that both Extreme 124 gr RN and these RMR 124 gr RN are shorter than the Berry's HBRN, so I do not need to move the load window even though I will be using a shorter COAL, correct?