480 ruger leading.

[flyfrod]

I worked up some loads for SRH 480 using 400 gr. boolits, tumble lubed with 21 gr. of H110. I'm getting great groups but their leading. Would pan lubing help or a gas check or maybe both? Also the boolits are sized as big as I can go and still get them to chamber.

[Lefty SRH]

What size are the cylinder throats? How smooth is the bore? Is there a constriction where the barrel in in the frame? What alloy?

[warf73]

Maybe your alloy is to soft?
Whats your chamber sizes?
Whats the barrel slug at?

If your chambers are smaller than the bore you will have a hard time getting it not to lead.

[M4bushy]

I'm pushing a lee 405gr with 19.5 gr of H110. I water drop straight wheel weights with no leading in my SRH with 9.5" barrel

[44man]

Use LUBE, dump the TL.
Boolits might be too soft.
The .480 is at home with PB boolits.

[white eagle]

are you shooting a checked boolit with out a check
I would also recommend dumping the tumble lube
mix your alox 50/50 with bees wax and make a great lube
pan lubing will probably hep some as long as you have size issue rite

[flyfrod]

I'm using air cooled WW for alloy, not sure what hardness is on them though. My barrel slugged at .476 so I sized at .477. I can't remember or find my cylinder sizes but I know that I couldn't go bigger than .477 with my boolits. I'm using the lee 400 gr. mold which is dropping around 405gr boolits.

[flyfrod]

I slugged the cylinder throats again and got .477 - .478. I couldnt size to .478 because I would be able to get the shells seat completely in the cylinder, it's tight at .477. There isn't any restriction at the threads either, as for the rest of the barrel I'm not sure..

[44man]

There is not much reason to keep going bigger. .476" should shoot.
I am confused with your sizing questions because most Lee molds do not cast so large to allow making them larger. I don't know if you can get .477" unless you have an exceptional mold. If it casts so large you can get a .478" boolit you might be wiping out GG's when you size.
I shoot that boolit by water dropping WW metal. I lube with Felix and push through a .476" Lee die.
Try water dropping and let them age a week.

[paul h]

I've shot air cooled and water quenched ww in both plainbase and gas checked 400gr cast over 21gr of H-110 in the 480. I've never had an issue with significant leading, though have had some mild leading. My throats are 0.479", I size .476" and I'm not sure what my bore slugs out to. I've used LBT blue, lithi-bee and appache blue lubes, all work well. I've never used tl for the full patch loads and would guess that's your issue.

I don't believe a gas check is needed for the 480, and I've found bullets from the lee 400gr mold are just as accurate as those I've cast from an LBT 400gr LFN mold, and my balisticast 400gr lfn mold.

[flyfrod]

My mold actually drops at .479 and I size to .477. The lube grooves seem to be fine after sizing. I'm not getting a lot of leading I just didn't know if pan lubing might help compared to tumble lubing. I have a scoped 7.5 SRH and can cover 3 shot groups with a half dollar so im happy with the load just not with the annoying leading.

[44man]

Change lube, everything else sounds fine.

[paul h]

A scoped 480 srh should be able to put 5 shots into a 1" ctc group at 50yds, and if you get everything absolutely right, doing so at 100yds is not unreasonable.

Try a quality conventional lube, your load really is beyond where most people find tl fails as a lube.