Larry wrote:The AMP is a very good machine. what I like about induction Annealing is that the amount of energy that you apply to the brass is nearly if not absolutely the same case after case after case.
I have made my own induction annealing machine you can adjust the case position in the coil and the length of time that the energy is applied for down to the hundredth of a second. It actually has one advantage over the base model AMP and that is that you place the case on a platform in a guide then start the pre programed time of annealing at the end a trap door is activated and the annealed case is drooped into an awaiting container. You simply place another case on the platform. The speed is greatly increased. Others have made automated case feeds for such machines so that they can operate completely unattended.
I cant say that I have seen an improvement on the target though due to annealing. Certainly I have had much more consistent case resizing however.
in2anity wrote:I honestly think tight, uniform neck tension is still of a concern for jumped pills, in magazine fed rifles where the mag length is the determining factor, or chambers with long throats unsuited to your short pill. Nonetheless I don’t want to start a discussion about this though, we been over and over it many times before - all I’m saying is annealing to achieve that tight, “new-brass-like” neck tension is still relevant to such guns.
Larry wrote:I'm not sure tight is the best word consistent but light is what I would be aiming for.
in2anity wrote:I honestly think tight, uniform neck tension is still of a concern for jumped pills, in magazine fed rifles where the mag length is the determining factor, or chambers with long throats unsuited to your short pill. Nonetheless I don’t want to start a discussion about this though, we been over and over it many times before - all I’m saying is annealing to achieve that tight, “new-brass-like” neck tension is still relevant to such guns.
in2anity wrote:Sure, if you're slow fire breech loading. But not for magazine-fed, fast fire details. I feel uncomfortable about very light neck tension when one is assertively feeding the rounds from a magazine, especially in some antiquated designs - I've seen bullet setback in the flesh, and it simply destroys your groups, not to mention being an elusive problem to diagnose. Moral of the story, you need to take it on a case-by-case basis... really depends on your application.
Larry wrote:True I am doing exactly that single loading for full bore shooting. Not necessarily slow but no mechanical operations. In the right conditions I can get rounds off every 5 seconds manually removing the empty cartridge, loading a new one and putting it on the target before the wind changes.
in2anity wrote:TT shoot as many rounds as possible in 1 minute. Usually a Service match, so scored on hits. Often incorporated into SMLE comps. https://www.youtube.com/watch?v=1DhjUrqH88s
in2anity wrote:Yeah nice BR, don't doubt that it's "good enough". You can also use a 2000w heat gun that produces temps up to 600 deg. The Ozito one will do it. Using a pair of pliers, hold the case by the base and shove the neck into the spout of the heat gun. Using a metronome app - for a .308 I hold it in there for 8 seconds, a .223 5 seconds and a 303 10 seconds - you should see the correct colour change.
on_one_wheel wrote:I still work in a dark room so I can see the very faint glow of the brass and use propane, a cordless drill, deep socket and a bucket of water.
I've got. 243 brass that's been reloaded 6 x with nothing but a neck size, yet to have a single crack in the 200 cases I'm using.
I love annealing, it definitely gives longevity to the brass and consistency to neck tension.
If I was consistently shooting 100 rounds or more a week I'd definitely get an automated annealer, but for now I'm happy enough with my method.
Larry wrote:Tassie good questions which I have never seen raised before and dont know the answers other than in a practical observed way. There are a couple of ways induction machines can work. I have made both. one is a copper coil with the case placed in the middle the other is a flux concentrator which is made from a ferite material and the copper coils are wound around this creating a current to flow. when a metal is placed in the gap.
Conductivity will have effect but I think it is more of an averaged thing of what is placed in the field. I think the same answer to this applies to your other question about uniform wall thickness. That at least in brass the thermal dissipation or conduction is so great that hot spots are not formed they propergate out into the brass so quickly. Heating the neck / shoulder junction of a 308 for 5 seconds can turn the neck cherry red too hot for annealing purposes but in less than 5 min the case has cooled enough to be handled. On the flip side the heat doesn't get too hot further down the case making the case too soft and dangerous to use.
The thinner walled brass certainly takes less time to heat I noticed that in the Winchester Vs Lapua settings that i had my unit set to and even then noticed some more inconsistency in the Winchester brass obtaining a different co lour in some case to others which translates to different temperatures reached. So given all that I think that you would be right if case necks were truly that inconsistent in neck wall thickness.
I use the thermal paint to set up the timer and a dark room as I dont want to see any colour change take place in the brass just on the thermal paint changing state.
TassieTiger wrote:Lol at BLR.
Now I’m thinking about it - you could utilise a lazy Susan type of set up or even a record turntable with slotted base and mini castors to hold cases and spin the cases - and opposite would be mounted Gas torch.
You’d have to find a small electric motor and arrange a belt / high gear to spin the castors, and a low gear to spin lazy Susan...put a timer on the low gear so after xx seconds it engages to move on to next case...
on_one_wheel wrote:I still work in a dark room so I can see the very faint glow of the brass and use propane, a cordless drill, deep socket and a bucket of water.
I've got. 243 brass that's been reloaded 6 x with nothing but a neck size, yet to have a single crack in the 200 cases I'm using.
I love annealing, it definitely gives longevity to the brass and consistency to neck tension.
If I was consistently shooting 100 rounds or more a week I'd definitely get an automated annealer, but for now I'm happy enough with my method.