.480 chamber problem

[Lefty SRH]

I have a Ruger .480 SRH. I cast a 420gr boolit for the beast and so far she shows real promise for accuracy. One catch though, one cylinder chamber seems to be short by about .020" I can't get 6 rounds in the gun. I thought just opening the throats to .476 would fix the problem but that didn't work.
Who can cut/ream the chamber a little deeper?

I don't really want to send it back to Ruger because I feel like they will just replace the cylinder and I already have money spent on the throat honing.

[tek4260]

You can do it yourself for the cost of a reamer. Of course sending it to Ruger might be best since there is probably a 50% chance that the new cylinder will have better sized throats.

[44man]

Ruger will fix it.

[Lefty SRH]

You can do it yourself for the cost of a reamer. Of course sending it to Ruger might be best since there is probably a 50% chance that the new cylinder will have better sized throats.

I tried looking for reamers but no luck. Then again I don't really know EXACTLY what typr reamer I need. Hamilton Bowen said "unthroated reamer". I guess I'll shoot the 5 good chambers and see how it groups and go from there.

[subsonic]

Trim the brass?

[white eagle]

what sub said
make sense is all your brass the same manufacturer and the same length ?
If not your problem may be there
what type of dies are you using
and try bumping the o/a back on the loaded round

[Lefty SRH]

Trim the brass?

An empty case seats just fine. A factory Hornady 325gr XTP has to be push in to inorder to seat fully.

[subsonic]

If an empty goes in, it's not the chamber. It's the throat too tight or your crimp is too severe.

See if you can push an XTP through that throat. If it goes, you are crimping too much and buckling the case.

Let us know what you find.

[Lefty SRH]

If an empty goes in, it's not the chamber. It's the throat too tight or your crimp is too severe.

See if you can push an XTP through that throat. If it goes, you are crimping too much and buckling the case.

Let us know what you find.

I understand what you are saying but the throats .476 and an XTP passes thru. The chamber may not have as much lead to the throat as the other chambers. The other 5 chambers seat just fine with my .476 cast boolits. Just the one I have problems with. I've measured around the crimp area of the case and they are not buckled in any way.

[Lefty SRH]

I don't have another .480 to compare mine too. I looked at all my revolver cylinders, .357, .44spl, .44mag, .45 colts (both of them). ALL of them have lead from the chamber to the throat. My .480 looks more like a .45 ACP cylinder as if it were headspaced off the case mouth instead of the rim. It has more of a hard sharp shoulder from the chamber to the throat.

[subsonic]

If an empty case fits, and a boolit fits, what's left?

Are ALL of the throats.476"?

[Lefty SRH]

If an empty case fits, and a boolit fits, what's left?

Are ALL of the throats.476"?

I don't know, thats what I can't understand. Like I said, maybe its missing the lean-in....

[Lefty SRH]

I found this picture of what I'm trying to explain. Specifically the short angle just in front of the case mouth and just under the base of the bullet in the picture.



http://www.shootingtimes.com/2011/01/04/ammunition_st_lowdownleadfoul_201002/

[white eagle]

If you are having those kind of issues I would not hesitate to send it back to Ruger
for their analysis

[subsonic]

Try this.

Size a case and try it in all 6 chambers. Expand it, and seat a projectile that you have previously slid through all 6 throats. Now, when you go to crimp it, just roll the bell in strait, do not actually crimp it.

Now try that in all 6 chambers.

Tell us what happens.

[Lefty SRH]

Try this.

Size a case and try it in all 6 chambers. Expand it, and seat a projectile that you have previously slid through all 6 throats. Now, when you go to crimp it, just roll the bell in strait, do not actually crimp it.

Now try that in all 6 chambers.

Tell us what happens.

Its a little better. The cylinder will spin but the rimmed is still a little off the surface of the cylinder. I pulled the bullet out and and turn it 90 degrees in the same problem chamber and it went all the way down. I don't get that part either.
LOL, hahaha, whats with this thing?

[subsonic]

Look through the cylinder and see if the throat looks centered in the chamber?

[Lefty SRH]

Best I can tell it is....

[subsonic]

Send it back.

[Three44s]

I'd also check to see that all fouling is removed before you send to Ruger.

Use a snug patch and some USP or JB bore paste on the offending chamber with a non-swiveling cleaning rod and hand rotate the dickens out of it.

Second, I like the Lee factory crimp die in instances like yours. It post sizes the loaded round. I have a Dan Wesson in .41 mag that must have this treatment or it does exactly your experience but on most chambers.

Hang in there though, I just traded last fall for a SRH in .480 and I tell you .......... the "ride" is FINE!!

Best of luck

Three 44s

[Lefty SRH]

Ruger sent my .480 back about a week ago (replaced the cylinder) and I took it out and shot it yesterday. WOW, she's a shooter. A little finicky on powder charges but definately accurate. I had a pair of one hole groups til I got excited and tossed two shots which resulted in one group being about 1.250" and the other 1.8" at 25yds. this was with an Accurate mold thats drops a 420gr boolit.

[475/480]

That's great news.

Sean

[white eagle]

now you can get that mold and boolit to sing
best..........

[Lefty SRH]

now you can get that mold and boolit to sing
best..........

They sang yesterday and I'm putting more together as we speak for another range session.

[Lefty SRH]

Oh and no barrel leading either!