TR,
I don't know what the pressure boost will be either. I think it will be inconsequential, unless you are shooting a Walker with 60 grs BP or a Rem with over 40. DON'T think you are gonna blow up your pistol's cylinder.
That said, I still don't think I, personally, need them. If you can sell a box or 2 to some of them with chronys, I'll wait to hear their reports, and STILL have little use for them.
Y'know, one of my s'in laws loads 300 gr balls in his 44 mag, his OWN dad thinks he is foolish, and he (the dad) shoots bowling pins every week in competition. He loads as hot as the 300 ball will allow, WAY too much kick for me, and for the old guy.
As far as the new bullets being pure lead, I don't know of any swaged balls made by anyone, that are not pure lead. The same s'in law has a 38 swaging setup for pistol bullets, requires pure lead, and it is a 'C' or 'O' type press. You ain't gonna squeeze alloyed lead by hand press.
That is not to say you cannot use an alloy in a BP revolver. Many say no, but others say yes, and some of those who say yes have better credentials than some of the posters here.
Cheers,
George
BTW, Manyirons, here's the number, no PM, 724 640 5021, my cell, the old guy wants to convince me that you guys are legit, tell him to give me a call.
If I can get a word in edgewise, I might ask him if he can do anything to my pistols, or ask him what he would want to reblue one or two of my modern firearms. He's only a hundred or so miles from me, with no Gunsmiths, to speak of, in my home territory, I might just drive over to see him.
Got a Browning O/U over 50 years old needs reblued, hesitant to send it to Browning, think it would cost too much there, got a 6 m/m-284 Varmint needs to be bright polished, my gunsmith, dead, now, made a kinda matte finish on it, built on a 98 action, would prefer it to be a nice shiny deep black-blue, even got a Rem pump 22, 582, had a bent barrel from the day I bought it, shoots a foot to the left ( I think, mebbe the right). Was gonna press it straight, if the Smith can do it better, easier, might get him to do it.
Cheers,
George