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30-40 case. What gives. #9371946 11/27/14
Joined: Nov 2011 Posts: 478 Western, WA P Paulh OP Campfire Member
OP Paulh Campfire Member P Joined: Nov 2011 Posts: 478 Western, WA	Better to show a pic. L to R #1 New RP case #2 Fired RP case (Ruger #3) #3 Factory Remington cartridge #4 Inert once fired ( fired in the Krag) #5 Inert w/ new RP case As you see both fired cases from two different rifles match the SAAMI spec for the 30-40. I have new Winchester cases and they measure the same as the Remingtons. New Winchester cases are the same as the new Remington's Difference from new case to fire formed cases. Temp: 65 degrees Chrony: Magneto Speed. Rifle: Ruger #3 22" barrel New 30-40 RP brass CCI200 Primer 150 grain Sierra BT COAL 3.08 Load 1- 2531fps Load 2- 2598fps Fired/FL Sized 30-40 RP brass CCI200 Primer 150 grain Sierra BT COAL 3.08 Load 1- 2686 Load 2- 2717 Why are the new 30-40 case not to SAAMI specs? But the fired cases from the Ruger and Krag rifles are. Last edited by Paulh; 11/27/14. https://sites.google.com/site/8mmmauserreloading/home

GB1

Re: 30-40 case. What gives. Paulh #9372043 11/27/14
Joined: Jun 2007 Posts: 21,955 H HawkI Campfire Ranger
HawkI Campfire Ranger H Joined: Jun 2007 Posts: 21,955	Brass that head spaces off of a rim is often short at the shoulder to fit, fire and function in a multitude of guns. New belted mag and other rimmed cases suffer the same "fit all" symptom. Rimless cases can also exhibit enough variance except they misfire

Re: 30-40 case. What gives. HawkI #9372137 11/27/14
Joined: May 2002 Posts: 9,528 Vic_in_Va Campfire Outfitter
Vic_in_Va Campfire Outfitter Joined: May 2002 Posts: 9,528	Yep. My .30-30 moves the shoulder forward .026" when first fired. I just bump it back .002" when I size.

Re: 30-40 case. What gives. Paulh #9373768 11/28/14
Joined: Sep 2004 Posts: 1,800 The U.P.'s U.P. BullShooter Campfire Regular
BullShooter Campfire Regular Joined: Sep 2004 Posts: 1,800 The U.P.'s U.P.	Originally Posted by Paulh ... As you see both fired cases from two different rifles match the SAAMI spec for the 30-40. ... Paulh- Actually, I cannot see whether any of these cases match SAAMI specs. My eyeball isn't sufficiently calibrated to find, for example, whether your case body diameters fall within the SAAMI spec of 0.4142" min to 0.4222" max at a distance of 1.600" from the case head. What technique did you use to measure the dimensions of the fired and unfired cases? Are you perhaps assuming that a case fire-formed in your rifle's chamber will conform to SAAMI specs? At least in the case of your Krag rifle (if it still has the original chamber from Springfield Armory) that may not be true. SAAMI standards were not established until about 30 years after they stopped making Krag rifles. What do your fired cases look like after they have been full-length resized? Do they still conform to SAAMI specs? Just curious. --Bob

Re: 30-40 case. What gives. BullShooter #9373789 11/28/14
Joined: Nov 2011 Posts: 478 Western, WA P Paulh OP Campfire Member
OP Paulh Campfire Member P Joined: Nov 2011 Posts: 478 Western, WA	Originally Posted by BullShooter Originally Posted by Paulh ... As you see both fired cases from two different rifles match the SAAMI spec for the 30-40. ... Paulh- Actually, I cannot see whether any of these cases match SAAMI specs. My eyeball isn't sufficiently calibrated to find, for example, whether your case body diameters fall within the SAAMI spec of 0.4142" min to 0.4222" max at a distance of 1.600" from the case head. What technique did you use to measure the dimensions of the fired and unfired cases? Are you perhaps assuming that a case fire-formed in your rifle's chamber will conform to SAAMI specs? At least in the case of your Krag rifle (if it still has the original chamber from Springfield Armory) that may not be true. SAAMI standards were not established until about 30 years after they stopped making Krag rifles. What do your fired cases look like after they have been full-length resized? Do they still conform to SAAMI specs? Just curious. --Bob Fired and FL resized cases are SAAMI. I used a caliper to measure. The new RP and WW cases are not as in the pic. The shoulder difference doesn't make a difference in the krag, but the Ruger is loaded heavier. Therefore I will fire form them before working up loads in the ruger. Last edited by Paulh; 11/28/14. https://sites.google.com/site/8mmmauserreloading/home

IC B2

Re: 30-40 case. What gives. Paulh #9374501 11/28/14
Joined: Jul 2012 Posts: 2,586 D dan_oz Campfire Regular
dan_oz Campfire Regular D Joined: Jul 2012 Posts: 2,586	FWIW I've found much the same thing with rimmed cases from .22 Hornet to 9.3x74R: they all start out a bit smaller than the chamber, and fireform to fit after the first time they're used. Perhaps the most extreme examples are my .303s, especially the wartime-production No. 4 I have. I have never worried about it. I work up loads in fireformed cases and neck-size only, to save excessive working of the brass. I'd suggest keeping the brass for each rifle of the same calibre separate though, which is what I do.

Re: 30-40 case. What gives. HawkI #9375109 11/29/14
Joined: Jul 2006 Posts: 5,279 Northwest Pennsylvania Everyday Hunter Campfire Tracker
Everyday Hunter Campfire Tracker Joined: Jul 2006 Posts: 5,279 Northwest Pennsylvania	Originally Posted by HawkI Brass that head spaces off of a rim is often short at the shoulder to fit, fire and function in a multitude of guns. New belted mag and other rimmed cases suffer the same "fit all" symptom. Rimless cases can also exhibit enough variance except they misfire Does this mean misfires are more likely with rimmed cartridges? Steve. "I was a deerhunter long before I was a man." ~Gene Wensel's Come November (2000) "A vote is like a rifle; its usefulness depends upon the character of the user." ~Theodore Roosevelt

Re: 30-40 case. What gives. Everyday Hunter #9375352 11/29/14
Joined: Sep 2012 Posts: 8,736 San Joaquin Valley, Kalifornis... calikooknic Campfire Outfitter
calikooknic Campfire Outfitter Joined: Sep 2012 Posts: 8,736 San Joaquin Valley, Kalifornis...	Originally Posted by Everyday Hunter Originally Posted by HawkI Brass that head spaces off of a rim is often short at the shoulder to fit, fire and function in a multitude of guns. New belted mag and other rimmed cases suffer the same "fit all" symptom. Rimless cases can also exhibit enough variance except they misfire Does this mean misfires are more likely with rimmed cartridges? Steve. No. Sean

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