bladeracer wrote:northdude wrote:see if you can feel how many flash holes it has the mil stuff over here has 2
Surely not the modern stuff?
northdude wrote:bladeracer wrote:northdude wrote:see if you can feel how many flash holes it has the mil stuff over here has 2
Surely not the modern stuff?
seems to pop up from time to time here don't know where it comes from or how old. I'm in nz not aussie
Downunder wrote:How far you go down the rabbit hole depends on why you’re handloading X your personality.
SCJ429 wrote:.....
I notice case head expansion when sizing my brass. More force is required. I seldom see the beginnings of case head separation when using high pressure. If you want to push it, use a reamer that gives you a tight chamber and don't push your brass around a lot when resizing.
SCJ429 wrote:The most obvious signs are a bolt that is harder to open and the shiney mark on the head stamp of your case where the brass is trying to migrate into the extractor. Keep aware and you won't miss these signs.
northdude wrote:It can also be dangerous under loading as well cant remember exactly why. I tend to load somewhere around the middle of min and max book loads.
disco stu wrote:I was reading that is not an issue in fast powders, but where is the line between slow and fast in this regard?
I gather the safe method is dropping 10% from max load or full case for minimum load, is that correct?
disco stu wrote:Cheers. I read with interest in one book about turkey loads, summed up exactly what I was hoping to eventually do in the 308. Used small loads of fast powder with light projectiles. It just left me uncomfortable even though he said that it's not an issue with fast powders
disco stu wrote:Thanks OB. 75% leaves a bit more leeway.
Yeah BR, trail boss is what I have in mind, but I've heard it's not available in Australia at the moment, or something to that effect. I was intending to use 2206h on the advice of Old Bloke so I can reduce loads to 60%.
disco stu wrote:Downunder wrote:How far you go down the rabbit hole depends on why you’re handloading X your personality.
My personality means I need to avoid rabbit holes at all costs Perfectionist tendencies and inquisitive mindset combined with science background makes me want to try all possibilities, which often sees me spending months testing and trying a heap of different things, before realising that what I got on day 2 was more than good enough for my intended purposes. I've at least been around long enough to know myself well enough in this regard!
Should have seen me building a bow press. Spent over a month on it coming up with crazy ideas and missing different bits that just ended up to complicated. I wound it right back to something simple with minor tweaks that works perfectly. I even modified it further by making it even more simple, while slapping myself in the face
My goal for this at least is a load that isn't stupid slow and is accurate for hunting. It appears that the difference between fast and slow in the loads I've looked at is only a few hundred fps, which isn't going to matter much at the ranges I hunt at-I'm not at the stage of taking 300m shots yet at animals, that's if I even had anywhere I could see them at that range. So it's really under 200m max.
bladeracer wrote:
Yep, unfortunately ADI has put production of all pistol/shotgun powders and some less-popular rifle powders on hold for a couple years.
AR2206H is incredibly versatile, great in virtually anything.
Downunder wrote:[
My 2c....
Basic reloading set up I’ll assume you’ll have a set of vernier callipers good to .000”, whilst not the highest precision tool it will give you an idea of any growth. Measure a factory unfired round, compare it to SAAMI and file the info, then down the track when you feel the need to measure a resized xx fired case and compare you can.
To be honest its very rare I measure the head or even see any expansion or excessive brass flow from the head in my loading and I load beyond manuals for 2 cartridges with brass life still well in the teens and even into the 2’s.
Exclusively it’s primer pockets with some shoulder and neck Issues that eventually takes brass out of service for me.
Unless your brass cycle is hyper quick ie you’re hunting for woolies or a tribe or have only 3 pc’s of brass then following the data of respected loading manuals I doubt very much that you’ll see any issues at the head.
My comment assumes you’re using quality components in a modern maintained quality firearm.
Downunder wrote:[
My 2c....
Basic reloading set up I’ll assume you’ll have a set of vernier callipers good to .000”, whilst not the highest precision tool it will give you an idea of any growth. Measure a factory unfired round, compare it to SAAMI and file the info, then down the track when you feel the need to measure a resized xx fired case and compare you can.
To be honest its very rare I measure the head or even see any expansion or excessive brass flow from the head in my loading and I load beyond manuals for 2 cartridges with brass life still well in the teens and even into the 2’s.
Exclusively it’s primer pockets with some shoulder and neck Issues that eventually takes brass out of service for me.
Unless your brass cycle is hyper quick ie you’re hunting for woolies or a tribe or have only 3 pc’s of brass then following the data of respected loading manuals I doubt very much that you’ll see any issues at the head.
My comment assumes you’re using quality components in a modern maintained quality firearm.
straightshooter wrote:For those that are interested, the only reliable way to evaluate excessive pressure in a 'high pressure' cartridge is to eliminate as many measurement variables as possible.
That is done by using a blade micrometer scaled in 0.0001 inch graduations or better still 0.001mm and measure in the extractor groove. (see picture)
The method is to make 3 measurements of diameter around the groove at 1/3rd of a rotation each and calculate the average before firing. Then do the same after firing. If there is as much as 0.0005 inch increase in average diameter then the pressure of the load recipe being employed is excessive for the case head hardness and temper in the brass being used.
Ideally for reliability this measurement procedure would be repeated over a number of samples for a reliable evaluation.
Also this method is only really useful in cartridges that operate in the 50 000 CUP or 60 000 PSI range which is approaching the ultimate tensile strength of brass.
straightshooter wrote:That is precisely the point of measuring where the brass is solid.
The purpose is to know whether the ultimate tensile strength of the hardest part of the brass case is being exceeded and not whether you are measuring the deformation of a thin section of softer brass that is intended to deform.
Or a tapered section of brass that can't be easily reliably measured.
bladeracer wrote:straightshooter wrote:That is precisely the point of measuring where the brass is solid.
The purpose is to know whether the ultimate tensile strength of the hardest part of the brass case is being exceeded and not whether you are measuring the deformation of a thin section of softer brass that is intended to deform.
Or a tapered section of brass that can't be easily reliably measured.
I understand that, but it requires immense pressure to expand the solid brass. By monitoring any expansion up higher, closer to the walls I would avoid ever getting near those sorts of pressures. Basically, I think the pressures that lead to expansion within the groove are far above where any of us should be shooting.