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siarra 155 palma matchin in semi auto
- Thread starter black_ump
- Start date
Re: siarra 155 palma matchin in semi auto
There is no reason why they wouldnt work well if say a 150 works well. Being a "Palma" bullet only means they are below 156grs and meant to be used by Palma shooters. There is nothing really special about Palma rifles other than we typically use long bbls and 1/13 twists.
Should be no reason why they would hurt your gun if you can normally shoot that weight bullet.
John
There is no reason why they wouldnt work well if say a 150 works well. Being a "Palma" bullet only means they are below 156grs and meant to be used by Palma shooters. There is nothing really special about Palma rifles other than we typically use long bbls and 1/13 twists.
Should be no reason why they would hurt your gun if you can normally shoot that weight bullet.
John
Re: siarra 155 palma matchin in semi auto
The ONLY rational to imply that PALMA loadings could possible hurt your gun is that (in the past) to get a 155 SMK (2155) bullet to 1000 yards solidly supersonic you needed both a stiff charge and a long barrel. The modern PALMA bullets have enough better BCs (now) that neither is absolutely necessary (for example the 155 SMK 2156 bullet).
However, semi-autos have specific pressure requirements as the bullet unplugs the gas release to cycle the action. Thus the long barrel PALMA shooters can get away with the slower burning powders and longer barrels in bolt guns while the semi guys need a powder appropriate for their gas system.
But not of this makes it impossible or even unlikely to get 1000 yards with 155s loaded to what your gun happens to like. Just start low, work up slowly, watch for both pressure signs on the cases and for semi-auto cycle signs* as you work your way up.
(*) throwing brass in funny places, beating up the brass,...
The ONLY rational to imply that PALMA loadings could possible hurt your gun is that (in the past) to get a 155 SMK (2155) bullet to 1000 yards solidly supersonic you needed both a stiff charge and a long barrel. The modern PALMA bullets have enough better BCs (now) that neither is absolutely necessary (for example the 155 SMK 2156 bullet).
However, semi-autos have specific pressure requirements as the bullet unplugs the gas release to cycle the action. Thus the long barrel PALMA shooters can get away with the slower burning powders and longer barrels in bolt guns while the semi guys need a powder appropriate for their gas system.
But not of this makes it impossible or even unlikely to get 1000 yards with 155s loaded to what your gun happens to like. Just start low, work up slowly, watch for both pressure signs on the cases and for semi-auto cycle signs* as you work your way up.
(*) throwing brass in funny places, beating up the brass,...
Re: siarra 155 palma matchin in semi auto
hey thanks for the heads up i guess ill try some palma bullets in my loading ration
hey thanks for the heads up i guess ill try some palma bullets in my loading ration
Re: siarra 155 palma matchin in semi auto
It won't hurt your rifle at all. I use the old PALMA 155 in my M1A Super match and it loves them. I have never taken them out past 600 yards but don't see why they wouldn't.
It won't hurt your rifle at all. I use the old PALMA 155 in my M1A Super match and it loves them. I have never taken them out past 600 yards but don't see why they wouldn't.
Re: siarra 155 palma matchin in semi auto
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: MitchAlsup</div><div class="ubbcode-body">The ONLY rational to imply that PALMA loadings could possible hurt your gun is that (in the past) to get a 155 SMK (2155) bullet to 1000 yards solidly supersonic you needed both a stiff charge and a long barrel. The modern PALMA bullets have enough better BCs (now) that neither is absolutely necessary (for example the 155 SMK 2156 bullet).
However, semi-autos have specific pressure requirements as the bullet unplugs the gas release to cycle the action. Thus the long barrel PALMA shooters can get away with the slower burning powders and longer barrels in bolt guns while the semi guys need a powder appropriate for their gas system.
But not of this makes it impossible or even unlikely to get 1000 yards with 155s loaded to what your gun happens to like. Just start low, work up slowly, watch for both pressure signs on the cases and for semi-auto cycle signs* as you work your way up.
(*) throwing brass in funny places, beating up the brass,... </div></div>
Never seen a safe load that was outside of port pressure specs for the M14 system, with any powder "faster" than 4831. Actually never checked the slower powders.
All speculation until you know what the pressure specs for port pressure are on the given semiauto, and have either tested or have reasonably reliable models of what the pressure is at that point of bullet travel.
With WW-748, for example, NRA testing long ago showed that the highest port pressures were with 150-gr bullets at reasonable speeds. The 168s and 173s and 180s used back then all showed lower port pressures, even if peak chamber was higher.
Even some loads found here on the 'Hide that modeled as significantly overpressure in my chamber (and my actual velocities were consistent with the predictions) were still within the port pressure specs.
To the OP, there's no way a Palma bullet can "hurt" your .30-caliber rifle. They work fine in mine.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: MitchAlsup</div><div class="ubbcode-body">The ONLY rational to imply that PALMA loadings could possible hurt your gun is that (in the past) to get a 155 SMK (2155) bullet to 1000 yards solidly supersonic you needed both a stiff charge and a long barrel. The modern PALMA bullets have enough better BCs (now) that neither is absolutely necessary (for example the 155 SMK 2156 bullet).
However, semi-autos have specific pressure requirements as the bullet unplugs the gas release to cycle the action. Thus the long barrel PALMA shooters can get away with the slower burning powders and longer barrels in bolt guns while the semi guys need a powder appropriate for their gas system.
But not of this makes it impossible or even unlikely to get 1000 yards with 155s loaded to what your gun happens to like. Just start low, work up slowly, watch for both pressure signs on the cases and for semi-auto cycle signs* as you work your way up.
(*) throwing brass in funny places, beating up the brass,... </div></div>
Never seen a safe load that was outside of port pressure specs for the M14 system, with any powder "faster" than 4831. Actually never checked the slower powders.
All speculation until you know what the pressure specs for port pressure are on the given semiauto, and have either tested or have reasonably reliable models of what the pressure is at that point of bullet travel.
With WW-748, for example, NRA testing long ago showed that the highest port pressures were with 150-gr bullets at reasonable speeds. The 168s and 173s and 180s used back then all showed lower port pressures, even if peak chamber was higher.
Even some loads found here on the 'Hide that modeled as significantly overpressure in my chamber (and my actual velocities were consistent with the predictions) were still within the port pressure specs.
To the OP, there's no way a Palma bullet can "hurt" your .30-caliber rifle. They work fine in mine.
Re: siarra 155 palma matchin in semi auto
45 grains of Varget in a Lake City Long Range, Winchester, or Federal case for AR-10Ts or AR-10 carbines.
45 grains of Varget in a Lake City Long Range, Winchester, or Federal case for AR-10Ts or AR-10 carbines.
Re: siarra 155 palma matchin in semi auto
I'm shooting the 2155's and the 2156's in a LR308. 45.5 RL-15 loaded at 2.8. Works great out of my gun, has not hurt anything that i know of.
I'm shooting the 2155's and the 2156's in a LR308. 45.5 RL-15 loaded at 2.8. Works great out of my gun, has not hurt anything that i know of.
