Back story........ I'm trying to find the right boolit for a Uberti 1885 rifle. I've slugged the bore and it looks like the groove diameter is roughly .378 to .379 depending on where I measure.
I just shot a series of lubed cast with a variety of powders and the boolits measure .379 or .3795 depending on where on the boolit I measure. But these ain't doing the job. At 50 yards the BEST I can get is a roughly 3" circle even from bench resting. I was expecting/hoping for more like 1" since I'm getting a really nice sight picture.
So I'm looking at some boolits I cast earlier for my rolling block which drop at .377 and thinking about PP'ing and then running through a custom push thru sizer to .380 (I've got the shop and tools for this).
Question....... Now the thing with .38-55 is that it's not a fast round. I'm going to guess that it'll be happiest even with PP rounds at around 1300 to maybe 1500 FPS. Is that going to be an issue for PP'ing?
I'm going to give it a try regardless and will report back with the findings. But I thought some of you might have some hints to avoid any slower speed pitfalls.
I've also been reading the sticky threads on papers and procedures on what to use and how to use it. Mostly I'm just wondering if there's any tricks I'll need to deal with the lower muzzle speed.