I finally have the scope adjusted for POI=POA at 100 yards for the .45-70 H&R 1871 Buffalo Classic I bought last summer.
But I have a new problem that popped up while I was getting the scope adjusted.
I cleaned the primer pockets on all 306 pieces of brass using an RCBS Primer Pocket Brush, chucked up in a drill clamped down to a platform, with the speed dialed back to a fairly slow speed. Plenty fast for what I was needing it to do, but nowhere near the several hundred RPM speed it was capable of. All of the primer pockets were nice and clean, no crud buildup in the bottoms.
I seated Winchester LR primers in a hundred or so cases using an old-style Lee hand priming tool (all the boolits I had available). Over the course of three outings, two to four weeks apart, I would load a round in the chamber, cock the hammer, sight and fire. Or rather, pull the trigger. Almost every single round would require two pulls of the trigger to ignite the primer. First trigger pull would "click". Second would "bang". Previously, shooting ammo that the friend that sold me the gun had loaded, every round went bang first time, every time.
I suppose it's possible the shellholder I bought for the Lee tool might have had enough slop in it (thinner than usual) that it would seat the primer below the head of the case but not actually to the bottom of the primer pocket. That would be inconvenient. But it's easy to measure the thickness of this new shellholder and compare it to others I have.
If that doesn't reveal anything (and even if it does), I will run a half-dozen or so through the RCBS single-stage and use the priming arm to confirm that the primers are fully seated, then take those and another six that are only Lee seated, shoot both groups, and see if it fixes the problem.
Any other ideas? Like, maybe, are Winchester primers hard to ignite?
Thanks in advance.