Hello shooters I have a question I hope I can get answered here.  I always used IMR 4227 powder with my Barrnet bullet in my 32-40 breach seated.  Velocity about 1450 app.  Using paraffin Vaseline and STP for lube.   
    Never had much leading before maybe a few flakes at the end of the day.  Started using 300 MP powder with Mag primers about the same vel. range and now noticed a lot more lead in the barrel.  Cleaned barrel after 10 shots and getting streaks of lead on the patch.  Using 25 to 1 alloy like I have always used.
    Besides going back to 4227 anybody have some good suggestions?
Charlie

you may want to try 4227  again and see if it still leads. If it does look at what else may have changed like new batch of alloy, new mix of lube, etc. I do have to agree with John Javalina works for me. LStuff (white label) has there version of it as well, also good folks to deal with.

Last two years I've been pre-lubing the bore in one of my 38-55s. Fired sixty rounds at the last match without cleaning. Not a speck of lead. Rifle leads without pre-lube. Badger barrel.

bnice  Could you share which of lsStuffs lube is their version of javelina lube. I have been using their Xlox 2500 plus lube with success, but am always open to trying something new, and they are good people to deal with. Thanks for a reply.  Krag

4060may   Thanks for the reply, you saved me a lot of trouble trying to find Alox 350 to approximate Javalina lube, and I appreciate it. I have used Darr lube for more years than I like to admit to, and It has always worked well enough for me and thought to try adding microcrystaline wax to up the melt temp as Darr lube gets a bit messy as the temp goes up. I have used an ice chest to keep the bullets cool until use, but a bit of a pita. LsStuff 2500 does solve the problem for me, but having more Vaseline on hand(not literally)Would like to make use of it, same goes for parafin, STP, and bees wax. Again thanks for the info.

Rick,
I'm guessing Joe does the same as I do.  Clean the barrel as normal - but just before you shoot, coat a patch with the same lube as your bullets and run through the barrel a few times...?  A simple method I use for coating the patches, pack 50 or a 100 patches in a small rubbermaid container.  Put a Tbs or two of lube in the container and set it on the dash of your vehicle, (in the sunshine) and about an hour or two of this and the patches are well soaked in your lube. 
CC, when I started making my own lube I had issues with leading using some powders and I was using the same lube recipe as you.  I think it was somebody here told me to drop the paraffin and use bees wax instead, most of my problems vanished.  I added one more ingredient for hot weather, about a teaspoon of Walmart brand Caster oil in my mix. .  After 50 shots I rarely see more than a slight trace of lead in my cleanings.

My nickle's worth
Greg

Follow up on lube question.  Received Javalina Schutzen lube from CPA this week and pan lubed some bullets.  I shot 50 and friend shot 50 in his rifle.  Both were amazed at how easy it was to clean the bores and no leading.  I was shooting 300MP and he was using H4227.  Now have to order more to last my life time before it becomes unattainable.
Thanks Mr. Louis

I do the same as GT and Joe. I keep a jag with a soaked patch already to go in a small lidded can with more patches and some lube if needed. My can is one of the big cans of Shinola polish that must be fifty years old. I don't know if I can still get one when it wears out- but, it's better than Joe's baggy.