So new challenge, would like some thoughts on this:
The bore is pitted a few spots, I'm guessing probably from use of corrosive ammunition back in the day, but the rifling looked good for the most part, so I took it with me to the range today. This is not the first time I've had a gun with a pitted bore, I've actually had a couple over the years, and most shot just fine with the fairly anemic lead wadcutters I load.
First, as much as I like the look of those magna stocks, they dont fit my hand very well, so after firing a couple rounds, I swapped them out for a Pachmayr grip I had in my range bag. With the bigger grips, I was able to produce around a 2" group at 10 yards easily, and shot a couple of those groups during my trip.
When I got home however, I noticed that the bore had pretty bad lead fouling in it, end to end, almost to the point where I could barely see the rifling. This surprised me a bit, as I shared the box of ammo with my no dash 686 without the fouling carrying over. Before taking the 38 M&P to the range, she got a full cleaning and lubricating with a combination of Lucas Oil CLP and Rennaisance Wax, something I do to the bore and chambers of all of my guns with good success, so pretty sure the bore was plenty lubricated. The bore also felt comparably tight to that on my 686 when running patches through it, leading me to believe it's within specification, though i haven't measured it for confirmation.
The loading for my wadcutters was Hornady 148gr lead HBWC over 4.0gr HP-38, which is on the high side of the spectrum, yes, but this is a standard load for me that works well in other revolvers. This, or 2.8gr of 700X which is a little more mild. Because it's on the high side, I don't suspect gas blow-by as a culprit, unless the pitting could be a cause?
Thoughts?
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