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It’s actually a gun I bought new several years ago. I’ve just recently pulled it out of the safe to try it out.

Well for those interested, today I loaded the same load 80 gr OE 1.5f with lube cookie and .442” dia. patched to .450”

Only change was after cleaning the chamber with alcohol and drying I dusted...

Rdf,
I agree. What’s puzzling to me is occasionally after firing 5 rnds 2 cases will only stretch .001-002”. As Don mentioned, the chamber is long. If there is a chance it would stop after reaching...

Well maybe you can afford to replace brass after it separates in the center after 2-4 firings but I can’t. So it is a worry to me. But on the other hand if this is the norm for everyone shooting bpc...

You know, I was actually wondering about that. I wondered since most I assume are using Swiss powder maybe I should try that.

JD

It separates on the third or forth firing after stretching .004-.008” per firing. What’s also puzzling is occasionally a case will only stretch .001-.002”!

I was using a squirt of Ballistol in my...

I have made a chamber cast and the length of the chamber is 2.129”. As for the throat there is no freebore as the rifling starts at the end of the chamber. That’s not to say that there’s not a...

I’m thinking now that I’m not building enough chamber pressure to get the case to grip the chamber walls in this factory chamber. Maybe due to the patched to bore bullet and the 16:1 alloy. Maybe...

Actually I hadn’t been annealing them. I just thought since everything seemed to be working backwards I’d try that too! Lol

I appreciate all the input I’ve received from you guys. I’m just going...

No my primers are not backing out.

I remembered that I had a device with dial indicator that was for determining headspace for contenders and that it would work perfectly for determining how much...

BTW, if I have excessive headspace it going to be due to the rim recess being cut too deep as the breach is touching the barrel extension when closed.

The breach block closes against the the barrel. I have tried aluminum discs on the case but it’s difficult to handle and measure. I’ll try tape and see if I can get consistent measurements. As for...

Chris,
That’s interesting. I’m looking into how to measure the headspace now.

Thanks
JD

Another question is what’s considered excessive headspace in a rolling block.

If the rim recess is cut 0.070” it’s going to have 0.004” right off the bat because the rim thickness on the brass...

Kurt,
I’ll try that but it’s going to be difficult as to the firing pin and holding the breac closed without having the hammer down. Wouldn’t a case without a spent primer work with the hammer down?

In a nut shell, at this point I’m trying different things to see what may be causing the case stretching. As for FL sizing I just tried it to see what would happen and found little difference.

I...

Thanks for the input.

Just needed to know what to expect. My cases are stretching around .005” first first and second firing (second being fire formed unsized. This is a factory Pedersoli chamber...

I’d like to know what’s considered to be normal case stretching for the 45/70 with factory chambers using paper patched to bore bullets.

I know there are many variables in reference to FL sized...

I have a Pedersoli RB 45/70 which doesn’t have a freebore but has a gradual leade angle/throat. So far using a .442 diameter patched to .451” it gas cuts and gives blow back except when using a .125”...

I know this post is old but what was the advice?

rfd,
In ref to the bore gophers, are you wetting just the front felt or both?

I checked to see if I could use a 30/06 FL die tomclose down the mouth but the case wont quite go in. I also tried a Dillon 45acp taper crimp die. It will just begin to enter the die but I haven’t...

rfd,
I took the delrin oring ends off the baco wipes and put them on the gophers before I found neoprene washers and nylon nuts and other that adding a little extra length they worked fine.

Rfd,
I’m familiar with what some call the pp chamber and understand how much easier that would be. I actually shot this rifle with gg bullets and I can’t remember having any stretching problems.
...

BTW
It appears after two firings with lube cookies the stretching stops or is only a thousandth or two.

Where did you get the modified taper crimp die?