Measuring and experimentation - Reloading Methodology https://systemz.online/reloading-methodology/measuring-and-experimentation/ AllGunStuff Discussion Board en-US Fri, 08 May 2026 11:50:36 +0000 wpForo 60 Re: Measuring and experimentation https://systemz.online/reloading-methodology/measuring-and-experimentation/#post-2444 Sun, 07 May 2023 10:08:55 +0000
When your die and chamber do not match, your chamber is off spec, then you need only think .303 Lee to see the results of stretching and work hardening.

Do a careful accurate cast of your chamber
Take it to a CNC tool and die maker ( guru ) and get him to make you a "body-die"
Then just use a LEE universal decap die and a collet neck size die - and once in awhile FL size with the body die]]> Reloading Methodology Newton https://systemz.online/reloading-methodology/measuring-and-experimentation/#post-2444 Re: Measuring and experimentation https://systemz.online/reloading-methodology/measuring-and-experimentation/#post-2440 Sun, 07 May 2023 01:54:33 +0000 Reloading Methodology Treeman https://systemz.online/reloading-methodology/measuring-and-experimentation/#post-2440 Re: Measuring and experimentation https://systemz.online/reloading-methodology/measuring-and-experimentation/#post-2434 Sat, 06 May 2023 08:18:57 +0000
Can you please let me know which world class enthusiast actually uses neck-sizing in competition?

What those who have actually done neck-sizing found out. At the third use of your cases, the bolt closes with some resistance.

This is caused by the base-to-shoulder measurement of the case increasing with every shot.


Thanks
What I was asking about in my post about measurement

Yes moving the shoulder affects the head-spacing on a center-fire rimless bottle nose cartridge

Something everyone worries about and why they do - stress-relief ( annealing ) on the shoulder and neck

However
One wonders about what happens with the rest of the body of the case and the web ?
This has to be sized to fit in the chamber but also expands upon firing ( and then "springs back")
One wonders if this part of the cartridge also "work-hardens" ?
Obviously if the web and area near the web is oversize the case will also not chamber - OR eject when fired !

Have you measured this portion of your cartridge - factory cartridge , and once fire cartridge ,and multiple fired cartridge
How much do these dimensions change ?

Have you measured your FL resizing die in the head / web area ?
In non-belted cartridges the case is sized all the way down to touching the shell holder
What are the differences between a factory round - and the fired rounds ?

Does this area "work-harden" ?  IF so why is this not important ?

BTW;
Does HOWA use SAAMI or CIP specifications / dimensions ?

]]> Reloading Methodology Newton https://systemz.online/reloading-methodology/measuring-and-experimentation/#post-2434 Re: Measuring and experimentation https://systemz.online/reloading-methodology/measuring-and-experimentation/#post-2430 Thu, 04 May 2023 06:32:54 +0000 The keeping track and then loading back to full length sizing just got too much.]]> Reloading Methodology Treeman https://systemz.online/reloading-methodology/measuring-and-experimentation/#post-2430 Re: Measuring and experimentation https://systemz.online/reloading-methodology/measuring-and-experimentation/#post-2414 Tue, 02 May 2023 23:35:56 +0000

Newton, how much reloading have you done?

Not enough
I try and learn from others more knowledgeable and experienced than I am
Those World class enthusiasts who are happy to share their knowledge.
Who are humble enough to state that they are still learning.
...


Can you please let me know which world class enthusiast actually uses neck-sizing in competition?

What those who have actually done neck-sizing found out. At the third use of your cases, the bolt closes with some resistance. By the 4th use you have to use quite a bit more force to get the bolt closed. 5th and up you basically need to travel with a hammer. A Palma shooter once broke the bolt handle off his Barnard P action during the WP open. He had to use a allen bolt and dishrag to keep shooting.

This is caused by the base-to-shoulder measurement of the case increasing with every shot. To avoid this, when neck-sizing, you should then use a body-die or full-length sizing die to bump the shoulder back 0.001"-0.003". That is when you realise that using a neck die then a body die, you might as well save a step and use the FL die from the start.

Unlike Mr Cortina, I won't say don't do neck-sizing. There are some cases where neck-sizing is preferred. Most notable if you have to load for an old battle rifle with oversize chamber. Like a Lee-Enfield circa 1920.]]> Reloading Methodology janfred https://systemz.online/reloading-methodology/measuring-and-experimentation/#post-2414 Re: Measuring and experimentation https://systemz.online/reloading-methodology/measuring-and-experimentation/#post-2412 Tue, 02 May 2023 12:19:19 +0000
BTW ;
What is the news on the availability of SOMCHEM propellant ?


*********************
I waS  sent a photo yesterday of MP 200 on some shelf somewhere, with S365. The post implied that it was available again ?
]]> Reloading Methodology Treeman https://systemz.online/reloading-methodology/measuring-and-experimentation/#post-2412 Re: Measuring and experimentation https://systemz.online/reloading-methodology/measuring-and-experimentation/#post-2404 Tue, 02 May 2023 06:34:46 +0000
Newton, how much reloading have you done?

Not enough
I try and learn from others more knowledgeable and experienced than I am
Those World class enthusiasts who are happy to share their knowledge.
Who are humble enough to state that they are still learning.

BTW ;
What is the news on the availability of SOMCHEM propellant ?
]]> Reloading Methodology Newton https://systemz.online/reloading-methodology/measuring-and-experimentation/#post-2404 Re: Measuring and experimentation https://systemz.online/reloading-methodology/measuring-and-experimentation/#post-2395 Mon, 01 May 2023 12:59:39 +0000 Reloading Methodology janfred https://systemz.online/reloading-methodology/measuring-and-experimentation/#post-2395 Re: Measuring and experimentation https://systemz.online/reloading-methodology/measuring-and-experimentation/#post-2392 Mon, 01 May 2023 11:46:27 +0000
R1000 experiment ? Would be interesting, but the answers are out there on the web already.

Reference please
]]> Reloading Methodology Newton https://systemz.online/reloading-methodology/measuring-and-experimentation/#post-2392 Re: Measuring and experimentation https://systemz.online/reloading-methodology/measuring-and-experimentation/#post-2385 Mon, 01 May 2023 07:53:05 +0000 ]]> Reloading Methodology Treeman https://systemz.online/reloading-methodology/measuring-and-experimentation/#post-2385