9x25 dillon
- Thread starter beeb173
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Sure.
I have done it using materials other than lead with less density and as a result lighter. Such as all copper bullets, similar to the barnes copper solids.
The problem is the lighter you go the more the short barrel hinders potential.
A projectile that light needs a longer barrel.
Think in terms of acceleration. The less time the projectile is spending in the barrel, the less time it has that pressure applying acceleration. So a heavier bullet gets more time with that 37,000+ PSI than one that left the barrel sooner. This results in a curve that favors a certain bullet weight window for optimal power gains.
The velocity gains as you go lighter within that window can be substantial, but beyond it become minimal.
So a G20 and 6 inch barrel actually will come closer to what you want. (Or if you can get longer than standard aftermarket G29 barrels in 9x25dillon.)
In the heavier loads you lose a lot less from a shorter barrel compared to longer barrels. So as you go lighter the performance difference between barrel lengths increases.
There is diminishing returns in velocity gains as you drop the projectile weight with such short barrels. Beyond a point you gain little feet per second for the power you gave up.
Additionally the lighter the projectile for the pressure you are operating at the louder the gun. Those would deafen you very quickly from an under 4" barrel, even with minimal protection like ear plugs.
Such a round would actually be better in a SMG type platform with at least an 8" barrel.
There is some ways around the limitations to an extent, like using sabot rounds. But these will be complex and harder to reliably use with an autoloader. The benefit of the sabot is you can get the increased surface area behind the bullet, which gives more surface area for the pressure to work on. For example 37,000 PSI in a .22 barrel creates less energy than in a .40 barrel. So if you were launching a .22 projectile from a sabot in a .40 barrel you can achieve more energy than from the .22 barrel with the same pressure.
Likewise the 10mm barrel using sabots to launch 9mm or even .22 bullets (the 5.7 is a .22 and you have a lot more case capacity with the 10mm.)
Being that the 9x25 dillon is a 10mm auto necked down to 9mm, if you just use a 10mm barrel and run sabots to shoot 9mm you can gain more perfomance (though likely at the cost of accuracy.)
I have done it using materials other than lead with less density and as a result lighter. Such as all copper bullets, similar to the barnes copper solids.
The problem is the lighter you go the more the short barrel hinders potential.
A projectile that light needs a longer barrel.
Think in terms of acceleration. The less time the projectile is spending in the barrel, the less time it has that pressure applying acceleration. So a heavier bullet gets more time with that 37,000+ PSI than one that left the barrel sooner. This results in a curve that favors a certain bullet weight window for optimal power gains.
The velocity gains as you go lighter within that window can be substantial, but beyond it become minimal.
So a G20 and 6 inch barrel actually will come closer to what you want. (Or if you can get longer than standard aftermarket G29 barrels in 9x25dillon.)
In the heavier loads you lose a lot less from a shorter barrel compared to longer barrels. So as you go lighter the performance difference between barrel lengths increases.
There is diminishing returns in velocity gains as you drop the projectile weight with such short barrels. Beyond a point you gain little feet per second for the power you gave up.
Additionally the lighter the projectile for the pressure you are operating at the louder the gun. Those would deafen you very quickly from an under 4" barrel, even with minimal protection like ear plugs.
Such a round would actually be better in a SMG type platform with at least an 8" barrel.
There is some ways around the limitations to an extent, like using sabot rounds. But these will be complex and harder to reliably use with an autoloader. The benefit of the sabot is you can get the increased surface area behind the bullet, which gives more surface area for the pressure to work on. For example 37,000 PSI in a .22 barrel creates less energy than in a .40 barrel. So if you were launching a .22 projectile from a sabot in a .40 barrel you can achieve more energy than from the .22 barrel with the same pressure.
Likewise the 10mm barrel using sabots to launch 9mm or even .22 bullets (the 5.7 is a .22 and you have a lot more case capacity with the 10mm.)
Being that the 9x25 dillon is a 10mm auto necked down to 9mm, if you just use a 10mm barrel and run sabots to shoot 9mm you can gain more perfomance (though likely at the cost of accuracy.)
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Yes. However you will not find many options for a g29 barrel because it is not considered a hunting gun. Even barrels in 10mm that are longer than stock are rare.
While you can easily find 6" barrels (in 10mm) made for the G20 because it is considered a hunting gun.
(There is minimum barrel lengths for hunting in some states, and in others some just like more power for hunting.)
So trying to find extended barrels in 9x25 dillon for the G29.is going to be near impossible.
You would have to make them or have them custom made for you.
While you can easily find 6" barrels (in 10mm) made for the G20 because it is considered a hunting gun.
(There is minimum barrel lengths for hunting in some states, and in others some just like more power for hunting.)
So trying to find extended barrels in 9x25 dillon for the G29.is going to be near impossible.
You would have to make them or have them custom made for you.
The recoil is for the most part easier to relate to momentum of the round reduced based on the firearm weight. So it would be lighter, but perceived recoil can be high because the muzzle blast will be more intense.
Many people think there is more recoil than there is when the muzzle blast goes up.
A standard 9x25 dillon is already pretty intense, and such rounds are even more intense. With blast that can be felt pretty strongly. It bothers the bones of the hands and forearms in some shooters.
But comparing recoil to recoil just check a recoil calculator. A glock 29 is listed at 24.7 ounces unloaded. With a longer barrel it will be over 25, plus ammo weight.
If we just round down to 24 ounces or 1.5 pounds to insure we overestimate recoil rather than underestimate you would get around 3 pounds of recoil from 55 gr at 2300 FPS, vs 11 pounds of recoil from 180 gr bullet at 1300 fps.
So yes recoil would be about 27% based on that quick calculation.
So almost 1/4 the recoil of 10mm.
Apparently the FN 5.7 has around 1.95 or 2 pounds of recoil based on something I just saw online, I didn't bother to verify by computing the numbers. So you would still have more recoil, but of course that 55gr is a bullet about double the weight of the ones in the 5.7x28 round.
Because the slide is also operated more from momentum/recoil you will likely need to adjust the recoil spring and use something lighter than stock with such light weight bullets for reliable cycling.
Many people think there is more recoil than there is when the muzzle blast goes up.
A standard 9x25 dillon is already pretty intense, and such rounds are even more intense. With blast that can be felt pretty strongly. It bothers the bones of the hands and forearms in some shooters.
But comparing recoil to recoil just check a recoil calculator. A glock 29 is listed at 24.7 ounces unloaded. With a longer barrel it will be over 25, plus ammo weight.
If we just round down to 24 ounces or 1.5 pounds to insure we overestimate recoil rather than underestimate you would get around 3 pounds of recoil from 55 gr at 2300 FPS, vs 11 pounds of recoil from 180 gr bullet at 1300 fps.
So yes recoil would be about 27% based on that quick calculation.
So almost 1/4 the recoil of 10mm.
Apparently the FN 5.7 has around 1.95 or 2 pounds of recoil based on something I just saw online, I didn't bother to verify by computing the numbers. So you would still have more recoil, but of course that 55gr is a bullet about double the weight of the ones in the 5.7x28 round.
Because the slide is also operated more from momentum/recoil you will likely need to adjust the recoil spring and use something lighter than stock with such light weight bullets for reliable cycling.
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Deaf Smith
Member
Just use the .32 ACP 71 gr FMJ and see what it can do inside a CCI snakeshot cap made to fit it and loaded on a .357 Sig or 9x25 Dillion.
Yes a sabot round.
Might be interesting.
Deaf
Yes a sabot round.
Might be interesting.
Deaf
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