Wildcat ?s

[dellet]

Possibly or turned out to be a turd.

This step I'm just curious about trim lengths. Working with gunsmith on load development. Also have been given some suggestions from Accurate and Hodgdon on powders to start with.

We're taking slow steps. Last thing we wanna do is blow up this expensive venture. That would suck.

I don't think a short neck ever killed anyone or blew anyone up.

Too long of neck has certainly caused some problems.

No one can advise you of a safe margin of length needed for the neck to stretch when firing. Unless they know how tight the neck is and an idea of operating pressures. Sounds like in this instance that would only be your gunsmith and the guy who made the reamer.

As an example, I had a reamer made that the only change was to tighten the neck diameter .003". I had to shorten the neck .005" from the original case length to get a clean release of the bullet.

Starting short and carefully allowing longer lengths would not be a bad idea. If you truly are doing something "no one has ever tried" a larger margin of error would be my way of doing it.

 

[dkhunt14]

I don't think a short neck ever killed anyone or blew anyone up.

Too long of neck has certainly caused some problems.

No one can advise you of a safe margin of length needed for the neck to stretch when firing. Unless they know how tight the neck is and an idea of operating pressures. Sounds like in this instance that would only be your gunsmith and the guy who made the reamer.

As an example, I had a reamer made that the only change was to tighten the neck diameter .003". I had to shorten the neck .005" from the original case length to get a clean release of the bullet.

Starting short and carefully allowing longer lengths would not be a bad idea. If you truly are doing something "no one has ever tried" a larger margin of error would be my way of doing it.

No case that I know of never gets longer with firing. When they are fired it now expands to fill the chamber and that makes it get shorter. It only gets longer after sizing. But you need to know the chamber length to make sure it is not to long to start with. Matt

 

[dellet]

No case that I know of never gets longer with firing. When they are fired it now expands to fill the chamber and that makes it get shorter. It only gets longer after sizing. But you need to know the chamber length to make sure it is not to long to start with. Matt

Is that a typo?

The whole reason for having room between the end of the neck and the transition step into the freebore is to keep the neck from stretching into that step and pinching the bullet.

No case measures the same on the bench, Than it would under pressure in the chamber, it's almost always shorter and smaller diameter.

How much room needed in front of the case to stretch, will partly be determined by how much room there is to expand and how much pressure the brass is under.

So a trim length safe for fire forming, may no longer be safe for full pressure loads in fully formed cases.

 

[dkhunt14]

Is that a typo?

The whole reason for having room between the end of the neck and the transition step into the freebore is to keep the neck from stretching into that step and pinching the bullet.

No case measures the same on the bench, Than it would under pressure in the chamber, it's almost always shorter and smaller diameter.

How much room needed in front of the case to stretch, will partly be determined by how much room there is to expand and how much pressure the brass is under.

So a trim length safe for fire forming, may no longer be safe for full pressure loads in fully formed cases.

Like I said, I know of no case that gets longer from firing. If you fireform they always get shorter. The only time i ever saw them grow is after sizing. I measure them after firing and after sizing. I could be wrong, but with the cartridges I played with they got shorter especialky if foreformimg. I believe the reason they recommend. 010 shorter trim length is for room for error and if carbon buildup is in chamber. Once the bullets gone, it doesn't matter. The pressure buildup is from the case getting jammed agaimst the end of the chamber and crimping and holding unto the bullet. Matt

 

[deadduck357]

I'm sorry fellows for wasting ya'lls time. I should have called reamer mfr first. However y'alls replies have also been very informative and helpful for a novice reloaded.

The chamber reamer was designed already to allow for expansion base off my cartridge print. He said to trim to my cartridge dimensions. I mentioned that based off similar cartridges that I had trimmed the first batch 0.010 less than cartridge specs and he said like some of y'all that it would cause carbon build-up but would be safe for initial load development. He said these will be .015 off chamber. A bit much but hate to chunk them.

So I'll use these to get started and hopefully will grow some after firing and FL sizing.

 

[deadduck357]

How I do it but you will obviously need a piece off brass that will fit your wildcat chamber

http://bulletin.accurateshooter.com/2018/03/how-to-craft-your-own-chamber-length-gauge/

Much thanks for that, ingenious!

 

[deadduck357]

As Dusty said, there is nothing new under the sun - P.O, Newton, somebody has done before. If it's something you are going to try and market I can understand keeping it on the DL but with your lack of experience and reluctance to give much info you are in some real hairy territory.
Your question reads like - "I plan on traveling to the moon, how much 02 do I need to bring with me? "
Can your at least give the volume of the case and weight of projectile you plan to use?

I know and apologize.

 

[Dusty Stevens]

Be sure before you use longer brass to clean that carbon out of the front of the chamber

 

[deadduck357]

https://www.sinclairintl.com/reload...s/sinclair-chamber-length-gage-prod32925.aspx

........ for whatever calibre (as in bore size, not cartridge form) your wildcat is in. You need to sacrifice one case by trimming it down by a tenth of an inch or so.

Very good also, thank you.

I'm sure I'll be coming back to this thread as this progresses.

 

[deadduck357]

I don't think a short neck ever killed anyone or blew anyone up.

Too long of neck has certainly caused some problems.

No one can advise you of a safe margin of length needed for the neck to stretch when firing. Unless they know how tight the neck is and an idea of operating pressures. Sounds like in this instance that would only be your gunsmith and the guy who made the reamer.

As an example, I had a reamer made that the only change was to tighten the neck diameter .003". I had to shorten the neck .005" from the original case length to get a clean release of the bullet.

Starting short and carefully allowing longer lengths would not be a bad idea. If you truly are doing something "no one has ever tried" a larger margin of error would be my way of doing it.

Thank you for that, confirms almost exactly what reamer mfr said.

 

[deadduck357]

Is that a typo?

The whole reason for having room between the end of the neck and the transition step into the freebore is to keep the neck from stretching into that step and pinching the bullet.

No case measures the same on the bench, Than it would under pressure in the chamber, it's almost always shorter and smaller diameter.

How much room needed in front of the case to stretch, will partly be determined by how much room there is to expand and how much pressure the brass is under.

So a trim length safe for fire forming, may no longer be safe for full pressure loads in fully formed cases.

Much thanks for that. I can see the difference between the formed and FL sized case and the three proof load cases - more defined. Will keep this in mind. Will measure these short cases after fire-formed.

 

[deadduck357]

Like I said, I know of no case that gets longer from firing. If you fireform they always get shorter. The only time i ever saw them grow is after sizing. I measure them after firing and after sizing. I could be wrong, but with the cartridges I played with they got shorter especialky if foreformimg. I believe the reason they recommend. 010 shorter trim length is for room for error and if carbon buildup is in chamber. Once the bullets gone, it doesn't matter. The pressure buildup is from the case getting jammed agaimst the end of the chamber and crimping and holding unto the bullet. Matt

So you're saying I can expect them to be even shorter after fire-forming? Then grow after FL?

They have been through forming die and FL die and trimmed.

 

[deadduck357]

Be sure before you use longer brass to clean that carbon out of the front of the chamber

Approx how many rounds would be a concern of carbon build-up before going to longer cases? And best process to clean out that ring?

 

[dkhunt14]

So you're saying I can expect them to be even shorter after fire-forming? Then grow after FL?

They have been through forming die and FL die and trimmed.

In most cases that is what I see. It may not be alot. Matt

 

[Dusty Stevens]

Approx how many rounds would be a concern of carbon build-up before going to longer cases? And best process to clean out that ring?

Iosso on a plastic brush spun around in there will keep it at bay

 

[deadduck357]

Iosso on a plastic brush spun around in there will keep it at bay

Iosso??

 

[deadduck357]

In most cases that is what I see. It may not be alot. Matt

Much thanks, will keep measurements.

 

[rebel]

Iosso??

It's a slight abrasive that removes tough carbon and copper fouling.

 

[deadduck357]

It's a slight abrasive that removes tough carbon and copper fouling.

Y'all are very helpful, will be ordering a tube. Thanks

 

[Dusty Stevens]

Y'all are very helpful, will be ordering a tube. Thanks

You can use flitz metal polish available at most hardware stores too.