Bent case??? |
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Shamu
Admin Group Logo Designer / Donating Member Joined: April 25 2007 Location: MD, USA. Status: Offline Points: 17603 |
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Look at how much the shoulder & neck junction have moved forward in that case thats bent. Can you check unfired against fired from the same lot to see if they were made short?
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Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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Goosic
Senior Member Joined: September 12 2017 Location: Phoenix Arizona Status: Offline Points: 8792 |
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The unfired case is 2.205. The fired case is 2.217.
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Shamu
Admin Group Logo Designer / Donating Member Joined: April 25 2007 Location: MD, USA. Status: Offline Points: 17603 |
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That is a lot of movement! This is about right: I think you might well benefit from the "O" ring trick mentioned earlier!
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Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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britrifles
Senior Member Joined: February 03 2018 Location: Atlanta, GA Status: Offline Points: 6539 |
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I measured some of my DI 43 brass. Here are the case body diameters:
New unfired case just above rim 0.452 Case fired in Savage just above rim 0.452 Case fired in Savage at largest diameter 0.454, this is approx 0.15 inches above rim. So there is a slight outwards taper above the rim as a result of firing. A case that is FL sized after firing, the max diameter of the case is not changed, it is still 0.454. There is no noticeable change in the position of the shoulder after firing a FL sized case in the Savage with the F51 barrel (I’ve confirmed this with a case gage), but the diameter at the shoulder (1.790 inches from case head) increases from 0.397 to 0.404 upon firing. Fired case on left, FL sized case on right. |
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Goosic
Senior Member Joined: September 12 2017 Location: Phoenix Arizona Status: Offline Points: 8792 |
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I'll post some pictures if I can get a good chamber shot. It still has the reamer marks. I was told ,"from the previous owner "that,the barrel was bought in bulk form unissued. There were no marks indicating that it was ever removed or installed, until I screwed it into its new home. The fired case has reversed reamer marks on it. The cases I used are Hornady and I had some issues in the past with them. I am going to try three separate batches of PPU, Herters,and S&B next time out to see if I can reproduce the original results...
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Zed
Special Member Donating Member Joined: May 01 2012 Location: France Status: Offline Points: 5585 |
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Interesting figures Britrifles. I was loading some rounds this morning and have measured the diameter of the brass just above the rim where my fired brass also measures 0.454" on the fired cases, and my full length resize reduces that to 0.450"; which is the same as new Remington brass that I checked.
The fired brass (from the No1MkIII*) at 0.454" will not chamber in my No4 Mk1 1944 Maltby. |
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It's nice to be important, but it's more important to be nice!
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britrifles
Senior Member Joined: February 03 2018 Location: Atlanta, GA Status: Offline Points: 6539 |
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Zed, I’m using an old RCBS F/L sizing die, it’s backed out of the press a bit from where it would be contacting the she!! holder. I had this set to just bump the shoulder back for FL sizing cases fired in my Long Branch No. 4 Mk 1/3. Fired cases in my LB would not chamber in the Savage. By FL sizing these cases, they would “just” chamber in the Savage, very slightest feel of resistance as the bolt reached the fully closed position.
The LB chamber (BSA barrel) must be a bit longer than the Savage (F51 barrel).
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Zed
Special Member Donating Member Joined: May 01 2012 Location: France Status: Offline Points: 5585 |
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I have set my rig to the Maltby fired cases; then it will load in all three rifles. Surprisingly it's my Fulton's No4Mk1/2 that has the biggest chamber. Fired cases from this rifle will not fit the No1MkIII* or the Maltby No4 Mk1. It would be nice to load for each specific chamber; but when you've got pot's of fired dirty brass; cleaned brass, trimmed and sized; then add how many times fired for each case to keep them apart. Any more than 2 rifles it get's complicated! Reseting the rig for each load etc. Anyway I'm not shooting bench rest and I'm not a good enough shot to really see the difference with a military rifle.
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It's nice to be important, but it's more important to be nice!
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Shamu
Admin Group Logo Designer / Donating Member Joined: April 25 2007 Location: MD, USA. Status: Offline Points: 17603 |
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What "britrifles" is describing is the "Partial full length resize" technique I use . I smoke smudge the case when setting it up & slowly work the backed off die down till I just get a lull circumference ring around the shoulder, indicating a minimal setback. (The "wet" look is from resizing lube over the smoke smudge.) |
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Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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englishman_ca
Senior Member Joined: September 08 2009 Location: Almaguin Status: Offline Points: 1089 |
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A picture is worth a thousand words.
Thanks Shamu
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. Look to your front, mark your target when it comes! |
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britrifles
Senior Member Joined: February 03 2018 Location: Atlanta, GA Status: Offline Points: 6539 |
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I measured the bottom of my RCBS FL sizing die at 0.452 inches. The brass will have a bit of spring back which probably accounts for the 0.454 max diameter of a sized case.
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Zed
Special Member Donating Member Joined: May 01 2012 Location: France Status: Offline Points: 5585 |
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We will be shooting the Fulton's No4Mk1/2 and the 1944 Maltby No4Mk1 this weekend. I will have to compare the fired cases afterwards. As the Maltby is my latest aquisition, I've not had much chance to try it out properly. Only used factory PPU in it so far. This weekend we'll be using 174 grain SMK's with 39.4 grains of Vectan SP7. It will be interesting to see which rifle comes out on top! The Fulton's is in good condition; but has had quite a few rounds through it over the years. The Maltby lay dorment after the war; properly stored (Resistance parachute drop) and was brought out a couple of years ago. It is like new mechanically.
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It's nice to be important, but it's more important to be nice!
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teenahlake
Newbie Joined: November 10 2019 Location: Alberta Status: Offline Points: 7 |
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10x1mm
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