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Just out of curiosity, I was wondering if there is a specific code or guide for deciphering the dies?
For example:
G-5.522/SBT/18/2.5/11.5/0.8
G-5.551/FV3-ELRS/18/2.5/12/0.8
The first half is self-explanatory; the second half covers the Ogive data?
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Just wondering the difference in the two?
What's the difference in the RBT punch and ELR punch? Im looking for one a little shorter and less pronounced thank the typical.
Thanks!
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Here is a comparison between GMI Freedom Press ELR boat tail slugs .22 at 40.1gr agains a well known other slug.
The GMI slugs was made by novice(me) still tuning the Press for the best results.
Anaway the results are pretty impressive thus far, and are only inpacted by the user of the press.
Red GMI slug and green other slug. 5 Shot groupings at 25m
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I noticed when swaging 0.2175 slugs with .177 wire that there are small imperfections on the body of the slug. I suppose this is because of the folds the wire makes when it is compresed into the bigger space. How can one get rid of the imperfections as I think this will impact the accuracy and/or the precision of the slugs.
Sorry for the Picture quality it was taken through a magnifying glass.
Hello Henry,
Try swaging without lube if you are swaging with lube!
And if you are swaging with lube you can also switch to WD-40 without silicone and see if the results improve.
Secondly imperfections on the lead wire can also translate on the slug.
Impurities in lead will come on the surface once it's swaged.
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I have recently purchased a freedom
press with solid nose die and boat tail punch
What an experience and the smartest investment I have ever made
I mainly shoot benchrest 100yards and 50m WRABF
I have done the first tests today I was really impressed I still have to tune my for better harmonics
Slug 40.6 gr
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Chapter 3 : Passion
Passion.
It’s the thing that keeps you restless, drives you a little crazy, and pushes you right to the edge — in the best way possible.
When GMI was founded, the mission was simple: build the best pellets and slugs we possibly could. Beautiful projectiles come from beautiful dies and tooling, and from day one we were obsessed with creating tooling that was second to none.
Human beings climb mountains and dive into the deepest parts of the ocean. For us, taking GMI from an idea to what it is today felt like our own mountain to climb.
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Chapter 2: The Ethos of Die Making
The art of making a die is defined by time. Time spent honing the craft, refining techniques, and learning (and unlearning) every single day. Mastery does not come quickly, and because of that, true trade secrets cannot simply be written in a manual. What can be shared, however, is the ethos behind our work.
Die vs. Mold
A die shapes metals or non-metals by forcing material into a cavity using punches, pins, or pressure.
A mold forms parts by allowing molten material to flow into a cavity and solidify.
The two are often confused—but they are fundamentally different disciplines.
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Chapter 1: Measurement units
At GMI, precision starts with how we measure. We build and gauge our dies and punches using metric units, where the smallest increment we work with is a micron—
1 micron = 0.001 mm = 0.000039 inches.
Why does this matter?
Most American die makers work in thousandths (0.001”) or ten-thousandths (0.0001”) of an inch. These are respectable units, but they simply don’t offer the granularity or fine resolution that micron-level measurement provides. No one in the imperial system works in “0.039 thousandths of an inch,” even though that’s what 1 micron actually is.
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Today I want to tell you the story the way it actually happened. No marketing, no polished corporate BS. Just the truth, because you deserve it.
Back in 2019, we (two engineers with zero shooting experience) had:
· No track record
· Never owned an airgun
· Never fired a single pellet or slug in our lives
· No idea we would ever end up in tooling
@Brett Delaney Can you please post a photo of the SBT and the ELRS slugs next to each other? I want to see the difference.