I am shooting a 300 gr gas checked semi wad cutter. at around 1900fps lubed with ls stuff 50/50 lube which is rated to 2200 fps with a gas check. I am noticing some leading and the bullets are a BHN between 16.6 and 17.9 Which should stand up to 21196-22852 psi with out a gas check. What I am wondering is should I go much harder with my lead? I am thinking of adding linotype and quenching to get a hardness of at least 22 but I thought the gas check would be the solution to leading. I am sizing to .452 by the way. I have shot this hardness and lube with a gas check on 30-30 bullets at similar velocities and never get leading. My other option is to use my carnuba red from LS stuff which should get me protection up to 2700 fps but I would have to empty out the lubrisizer which is a chore.

What hardness do you recommend for gash checked bullets in this caliber at full velocities? I honestly think my biggest issue is not getting enough lube to the muzzle even though there is lube ending up in the muzzle break ports. I am wondering if tumble lubing them after I run them through the lubrisizer might help.

Please let me know what you think.

I am not a caster but do shoot a 460 SW and have stayed in a Holiday Inn Express.

Gas check should elevate your leading but from your link to lubes I would suggest using one of their higher speed magnum lubes rather than the 50:50.

You are dealing with the highest velocity handgun cartridge so perhaps the Carnuba Red or the BAC???

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Still Running Against the Wind

Before you start chasing your tail, do some measuring. What does the bore slug? What does each cyl throat measure? Where is the leading, early all thru or at the muzzle? You are sizing to 0452" but pull a loaded bullet & measure that. Crimping may be under sizing the bullet a Bit. Lots of things besides lube & alloy to consider. Bullet fit is king, everything else is negotiable.

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NRA Cert. Inst. IDPA CSO

In general leading near the forcing cone is a fit issue, leading near the muzzle is a running out of lube issue. You say lube is reaching the ports so I assume some start of a lube star at the muzzle? Reread Freds post, you know what you are sizing to but do you know why you are sizing to that? I shoot bullets of 13-14 bhn to 32,000 cup so hardness would be the last area I would check.

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Front sight and squeeze

My bullets are being sized in a .452 sizer but are coming out .453. The chamber mouths are .452 and the goove dia .451. Five groove barrels are difficult to measure and so are the slugs that come from them.

Here is the funny thing about that. There is grease in the ports on the break but not much inside the break itself and none in the end of the bore much less a grease ring on the muzzle. I have no idea where this grease or what ever it is is even coming from if there wasn't enough for the bore.

So those dims are solid. Pull a seated/crimped bullet & measure that. Where exactly is the leading? If it is at the muzzle brake, I would expect that. Brakes & lead bullets don't always play well together. If all the dims are coming out right, try switch lubes before alloy. The gc makes the alloy almost the last issue.
Fwiw, if you tinker with the alloy, either add Lino or water drop, not both. My range scrap comes in about 11bhn. Water dropped, it is 20-21bhn. IMO, water dropping & adding Lino is just a waste of Lino.

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NRA Cert. Inst. IDPA CSO

This is water dropped WW alloy which yields an initial BHN of around 16. I imagine if I checked again in a month it would be in the 20's. I'll have to do that. I coated the bullets in the lee lube alox in addition to running them through the lubrisizer. we will see what happens tomorrow.