cast sizing to chamber

[billnconnie]

Got a ruger super blackhawk in 44 mag, sluged the barrel and cylinders. Barrel was .4295 cylinders were .4305 to .431, I opened up my .429 sizer to .431 and the slugs are just a little tight in the cylinders. Will this be a problem? Or is this desirable?
Thanks Bill

[DLCTEX]

If they will chamber I would think they will be fine. Just make sure the case has a slight clearence in the chamber and work up the loads from starting loads.

[462]

You should be good to go. With revolvers, you size to the cylinders, just as you did.

I've had to enlarge two sizers by hand, and may have to do a third.

[runfiverun]

like dale said make sure there is room in there for the case to let go of the boolit.
but the bigger you can get away with is usually the way to go.

[243winxb]

All at Lymans website under FAQ http://www.lymanproducts.com/lyman/home/ Lymans methods have worked for me over 30 years.
Q: How do I determine the proper sizing die for my particular gun?
A: We recommend slugging the barrel. Select a sizing die that is .001" over your groove diameter. And another good one.
Q: I have run my bullets through the sizing die, however they do not come out at the expected diameter. These were cast in wheelweights, would that make a difference?
A: Yes, bullets cast in pure lead or wheelweights will come out smaller, bullets cast in linotype will come out larger. This is due to the spring-back of the bullets being sized. The sizing dies are made to produce the diameters using #2 alloy.

[billnconnie]

Loaded some of the .431 bullets (Lyman 429421) and they dropped in the cylinder just find.
The strange thing about this is I had some old bullets sized with the .429 sizer (20 grs. 2400) and they shot well 1.25" at 25 yards (5 shots). They were 100% lino.
The bullets I loaded (18 grs. 2400) tonight were 2 to 1 lead and lino.
Will shoot them tomorrow and see if there is any improvement.
They weighted 4.5 gr. more than the straight lino.
Thanks for all the replies.
Thanks Bill

[mtgrs737]

Let us know how they shoot. Please

[billnconnie]

Ok here the results;
The new bullets shot about the same (1.25" to 1.5" at 25 yds) as the lino bullets.
The lino bullets will have flyer at times the new bullets didn't.
The only difference the groups were about 3" higher than the lino groups.
The only difference was the lead mix and the new bullets were lubed with BAC the old lino were lubed with RCBS lube.
Any Idea why the difference in impact?
Thanks Bill

[Hayfield]

Feel free to ignore this question but I really don't understand this at all. I don't load for pistol and may never. But if A.)the cylinders measure .431 and B.) the bullet is sized .431 and C.) the brass wall is (and I've never measuured pistol brass) .010. How in the world can you get the cartridge, .451 (.431 bullet + 2 x .010 brass walls) into a .431 cylinder? Kinda like getting 11 gallons into a 10 gallon hat, isn't it?

[billnconnie]

It is actually the throat of the cylinder that measures 431.
Bill

[Hayfield]

Bill. So in 'revolverspeak' the cylinder has a loading section and a preforcing cone section? Learn something new everyday, thanks.

[243winxb]

Any Idea why the difference in impact? 2gr less powder, longer barrel time, shoots higher at 25yds.

[billnconnie]

Should have said that the 18gr. load didn't shoot that well, the 20gr. (2400) loads were the same for both bullets only the bullet lead recipes were different and the lube and the size.
Are you saying that the new load is slower and that the reason for the different impact?
Bill

[44man]

Should have said that the 18gr. load didn't shoot that well, the 20gr. (2400) loads were the same for both bullets only the bullet lead recipes were different and the lube and the size.
Are you saying that the new load is slower and that the reason for the different impact?
Bill
Yes, when you slow the boolit it is in the barrel longer and the barrel is higher before it leaves.
You are not near the accuracy point yet with 18 gr, work up some more and don't use magnum primers. You should get groups like that at 50 yards with the right load.
I never had much luck with 2400, I find 296 is more accurate.
But either way work up slowly and watch for groups to tighten, then start to open again, back down to the best.
You have a good fit on the boolit, go for it. :Fire:

[243winxb]

.Are you saying that the new load is slower and that the reason for the different impact? Yes if using less powder. what 44man said. Also if the alloy, diameter, and lube is change, it has to make a difference. You said
They weighted 4.5 gr. more than the straight lino With the same powder charge, the more heavy bullet may go slower as it leaves the barrel. It would shoot higher, barrel time is longer. My most accurate loads are with WW296 also.

[billnconnie]

Hate to bring this old post back to life but would like to post what I have discovered.
First my dial caliper were off by .001 which I discovered after shooting the .431 bullets they should have been .430, these would go through the throat with finger pressure behind them. The .431 had to be driven out with a punch.
At any rate, off to the range with the new .430 bullet setting on top of 21 gr. of 2400 Fed. 150 primer, next was 20 grs. 2400 with 150 Fed. primers.
Both groups were over 1.25" at 25 yds.
I then went back to my original load of 20 grs. 2400 with CCI large pistol primer and the .430 bullet with a little extra crimp. The result were much better Believe I will try 19.5 grs before I settle on this load.
I will try to post my target ( 25 yds.) never have try to before.
Sorry for the long post.