Could someone please give me the length of this bullet? Thinking of using it in my next .308 and need to figure my twist rate.
Thanks
Thanks
Sierra 155 gr Palma
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Re: Sierra 155 gr Palma
Dont recall the length off the top of my head but you will want at least 1/13. Anything faster should work just fine too and then leave room for heavier stuff.
Dont recall the length off the top of my head but you will want at least 1/13. Anything faster should work just fine too and then leave room for heavier stuff.
Re: Sierra 155 gr Palma
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: triple 6</div><div class="ubbcode-body">I have a 1-11" blank, just wanting to make sure that would be optimum. </div></div>
Don't know about optimum but shot ok out of 1-11 TRG 22 but just ok. I worked with 4 different powders and various seating depths and gave up on the 2156. Ended up with Berger 155.5 FB.
Length 1.206"
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: triple 6</div><div class="ubbcode-body">I have a 1-11" blank, just wanting to make sure that would be optimum. </div></div>
Don't know about optimum but shot ok out of 1-11 TRG 22 but just ok. I worked with 4 different powders and various seating depths and gave up on the 2156. Ended up with Berger 155.5 FB.
Length 1.206"
Re: Sierra 155 gr Palma
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Mudcat-NC</div><div class="ubbcode-body">optimum is probably 1/12.5, with the 2155s, 1/13
</div></div>
MC, can you get the old 2155 Palma anymore?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Mudcat-NC</div><div class="ubbcode-body">optimum is probably 1/12.5, with the 2155s, 1/13
</div></div>
MC, can you get the old 2155 Palma anymore?
Re: Sierra 155 gr Palma
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Mark S</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Mudcat-NC</div><div class="ubbcode-body">optimum is probably 1/12.5, with the 2155s, 1/13
</div></div>
MC, can you get the old 2155 Palma anymore? </div></div>
The 2155 is most certainly orderable from Sierra. It no longer has a a Palma label and gold stripe on the box. The 2156 wears those items on its box now.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Mark S</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Mudcat-NC</div><div class="ubbcode-body">optimum is probably 1/12.5, with the 2155s, 1/13
</div></div>
MC, can you get the old 2155 Palma anymore? </div></div>
The 2155 is most certainly orderable from Sierra. It no longer has a a Palma label and gold stripe on the box. The 2156 wears those items on its box now.
Re: Sierra 155 gr Palma
So if both bullets are still available, so in your opinion, and you know what they say about those, which would you prefer, and why did Sierra change designations on these two bullets? Thanks for the info, keep it coming.
So if both bullets are still available, so in your opinion, and you know what they say about those, which would you prefer, and why did Sierra change designations on these two bullets? Thanks for the info, keep it coming.
Re: Sierra 155 gr Palma
They did not change the designation of two bullets. They made a new bullet that followed different design principles. They both weigh 155 grains so to comply with the international fullbore rifle competition restrictions.
If you are asking why did Sierra make the 2156, that is a different question and corresponding answer.
Sierra made the 2156 because the US Palma team got its ass kicked in 2007 for a whole lot of different reasons resulting in massive changes to the program and equipment going into the 2011 rotation.
A suitable (and superior) projectile from a different supplier already existed on the market at the time. The decision to develop a new projectile using the existing supplier and adoption of said projectile for the 2011 championship is the route the organization went rather then utilizing the existing superior product.
The 2155 is a very forgiving bullet that will shoot well in about any powder/twist rate/barrel length/OAL combo. The 2156 is a more picky bullet with a slightly higher BC.
Just knowing the length of the bullet will not be the fix all to your original question in the first post. If you are set on shooting the 2156 in your tactical build, I'd suggest a 12 twist cut rifled barrel, chambering with the 95 Palma or USRifleteam reamer, running an OAL of 2.800" or 2.840", and pushing them pretty hard. jpipes here on the 'hide has had some outstanding results with them using IMR 8208 powder in a 20" barrel.
I coached a 1000 yard team match yesterday with shooters running the 2155, the 155.5 Fullbore, and me the 2156. Honestly I never thought once about who was shooting what bullet. Rear sight thread pitch was the only variable I forgot to account for early on that I made an adjustment for on the second shooter. 40 TPI instead of 32 TPI starts to add up when you start piling the windage on.
They did not change the designation of two bullets. They made a new bullet that followed different design principles. They both weigh 155 grains so to comply with the international fullbore rifle competition restrictions.
If you are asking why did Sierra make the 2156, that is a different question and corresponding answer.
Sierra made the 2156 because the US Palma team got its ass kicked in 2007 for a whole lot of different reasons resulting in massive changes to the program and equipment going into the 2011 rotation.
A suitable (and superior) projectile from a different supplier already existed on the market at the time. The decision to develop a new projectile using the existing supplier and adoption of said projectile for the 2011 championship is the route the organization went rather then utilizing the existing superior product.
The 2155 is a very forgiving bullet that will shoot well in about any powder/twist rate/barrel length/OAL combo. The 2156 is a more picky bullet with a slightly higher BC.
Just knowing the length of the bullet will not be the fix all to your original question in the first post. If you are set on shooting the 2156 in your tactical build, I'd suggest a 12 twist cut rifled barrel, chambering with the 95 Palma or USRifleteam reamer, running an OAL of 2.800" or 2.840", and pushing them pretty hard. jpipes here on the 'hide has had some outstanding results with them using IMR 8208 powder in a 20" barrel.
I coached a 1000 yard team match yesterday with shooters running the 2155, the 155.5 Fullbore, and me the 2156. Honestly I never thought once about who was shooting what bullet. Rear sight thread pitch was the only variable I forgot to account for early on that I made an adjustment for on the second shooter. 40 TPI instead of 32 TPI starts to add up when you start piling the windage on.
Re: Sierra 155 gr Palma
_9h is, as per usual, spot on. I am currently running the 2156 out of a 20", 11.25 twist, Rock barrel. 46.0 grains of 8208 and a .050 jump gives me excellent and repeatable accuracy....and 2890 fps, according to an Oehler at Rifles Only last weekend. Jacob was hitting steel at 1k in a 20-25 mph quarter value wind, 8.7 mils elevation (3000-ish DA), 1.0-2.2 wind depending. It was an impressive display
I can like the price too.
_9h is, as per usual, spot on. I am currently running the 2156 out of a 20", 11.25 twist, Rock barrel. 46.0 grains of 8208 and a .050 jump gives me excellent and repeatable accuracy....and 2890 fps, according to an Oehler at Rifles Only last weekend. Jacob was hitting steel at 1k in a 20-25 mph quarter value wind, 8.7 mils elevation (3000-ish DA), 1.0-2.2 wind depending. It was an impressive display
I can like the price too.
Re: Sierra 155 gr Palma
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Mark S</div><div class="ubbcode-body">9H, would that "superior projectile" start with a B as in Berger? </div></div>
Mark, I have provided enough information above that you can figure that out for yourself; I hope you can also read the rest of the post and pull from it that there is more to all this than just a singular view of BC as well as how little difference this can make in actual use when all other factors are considered.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Mark S</div><div class="ubbcode-body">9H, would that "superior projectile" start with a B as in Berger? </div></div>
Mark, I have provided enough information above that you can figure that out for yourself; I hope you can also read the rest of the post and pull from it that there is more to all this than just a singular view of BC as well as how little difference this can make in actual use when all other factors are considered.
Re: Sierra 155 gr Palma
Got it 9H. I'm also going to assume politics had it's roll in the bullet selection but enough said. Thank you for your input.
Got it 9H. I'm also going to assume politics had it's roll in the bullet selection but enough said. Thank you for your input.
Re: Sierra 155 gr Palma
9H and JPipes, thanks for the info. I normally shoot 175's, but I'm wanting to build a rifle for a class called tactical hunter that is shot from a bench here close to my AO. I was handed my butt in a sling this past weekend by guys that were shooting alot of .260's. And me being the person I am just refuses to convert to that round. So I'm thinking of droping to the .155's in the .308 to get hopefully similar ballistics. I have a .308 Palma reamer, but am thinking more of loading a dummy round and having a reamer ground for it. I have an 11 twist barrel from Schneider, but have the feeling it's not the best twist for that bullet, so I'm going to have to order another. I'm basically looking for any good info out there.
9H and JPipes, thanks for the info. I normally shoot 175's, but I'm wanting to build a rifle for a class called tactical hunter that is shot from a bench here close to my AO. I was handed my butt in a sling this past weekend by guys that were shooting alot of .260's. And me being the person I am just refuses to convert to that round. So I'm thinking of droping to the .155's in the .308 to get hopefully similar ballistics. I have a .308 Palma reamer, but am thinking more of loading a dummy round and having a reamer ground for it. I have an 11 twist barrel from Schneider, but have the feeling it's not the best twist for that bullet, so I'm going to have to order another. I'm basically looking for any good info out there.
Re: Sierra 155 gr Palma
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: triple 6</div><div class="ubbcode-body"> I was handed my butt in a sling this past weekend by guys that were shooting alot of .260's. And me being the person I am just refuses to convert to that round. So I'm thinking of droping to the .155's in the .308 to get hopefully similar ballistics. </div></div>
Sorry but you arent going to get anywhere near similar ballistics out of a 308, especially with the 155s vs a 260. If you run a 260 with a 142, at any reasonable speed, you aint touching it with a 308, with any bullet. Sounds like rebarrel time.....or, you get better playing in the wind and beat them that way. The second way, is tougher, of course, but a lot more challenging and fun.
John
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: triple 6</div><div class="ubbcode-body"> I was handed my butt in a sling this past weekend by guys that were shooting alot of .260's. And me being the person I am just refuses to convert to that round. So I'm thinking of droping to the .155's in the .308 to get hopefully similar ballistics. </div></div>
Sorry but you arent going to get anywhere near similar ballistics out of a 308, especially with the 155s vs a 260. If you run a 260 with a 142, at any reasonable speed, you aint touching it with a 308, with any bullet. Sounds like rebarrel time.....or, you get better playing in the wind and beat them that way. The second way, is tougher, of course, but a lot more challenging and fun.
John
Re: Sierra 155 gr Palma
I've got several friends who are trying to convert me to the .260, but like I was saying it goes against the grain for me. But it's still a possibility I suppose (maybe).
I've got several friends who are trying to convert me to the .260, but like I was saying it goes against the grain for me. But it's still a possibility I suppose (maybe).
Re: Sierra 155 gr Palma
Mark, we run the 155 lapuas in our 308s @ 2930. If you run the #s on this, at ASC we get 8.3 mills to 1000. That is inside a large percentage of 260 stuff and you saw te performance in Brads 308.
Mark, we run the 155 lapuas in our 308s @ 2930. If you run the #s on this, at ASC we get 8.3 mills to 1000. That is inside a large percentage of 260 stuff and you saw te performance in Brads 308.
Re: Sierra 155 gr Palma
260`s are o.k.... 6.5x55 better.... more powder better brass
omho
bill larson
260`s are o.k.... 6.5x55 better.... more powder better brass
omho
bill larson
Re: Sierra 155 gr Palma
Jon, what load are you running, and what chamber/twist on your barrels. I'm still shocked over that match, I know I had to hit two of those pieces of steel twice to knock it off, and I know I wasn't the only one. What are your thoughts?
Mark
Jon, what load are you running, and what chamber/twist on your barrels. I'm still shocked over that match, I know I had to hit two of those pieces of steel twice to knock it off, and I know I wasn't the only one. What are your thoughts?
Mark
Re: Sierra 155 gr Palma
Once upon a time I ran a 6.5x55, my wife a 260. I dont see any real advantage to the 6.5x55. If you have a short action select the 260.
Now I run a 308. best advice I can give a beginner is dont worry what you shoot against, worry about wind reading and breaking the sear when you want it to go.
Improve yourself first, onething that 308 will do is either create a good windreader out of you, or a good fisherman!
Its sometimes tough to sit though a learning curve, but tempered you will be.
Once upon a time I ran a 6.5x55, my wife a 260. I dont see any real advantage to the 6.5x55. If you have a short action select the 260.
Now I run a 308. best advice I can give a beginner is dont worry what you shoot against, worry about wind reading and breaking the sear when you want it to go.
Improve yourself first, onething that 308 will do is either create a good windreader out of you, or a good fisherman!
Its sometimes tough to sit though a learning curve, but tempered you will be.
Re: Sierra 155 gr Palma
47 g varget in a trg22 26" and I think they are 12 twist and 46 g Varget in an APA Bartline that is 24" and 11 and change twist. Both push 2930 even though the Bartline is 2" shorter and 1g less powder. Both are loaded mag length.
47 g varget in a trg22 26" and I think they are 12 twist and 46 g Varget in an APA Bartline that is 24" and 11 and change twist. Both push 2930 even though the Bartline is 2" shorter and 1g less powder. Both are loaded mag length.
Re: Sierra 155 gr Palma
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Jon Lester</div><div class="ubbcode-body">Mark, we run the 155 lapuas in our 308s @ 2930. If you run the #s on this, at ASC we get 8.3 mills to 1000. That is inside a large percentage of 260 stuff and you saw te performance in Brads 308. </div></div>
Jon,
It doesn't matter whose 155 you run, or at what speed. You may hang with a .260 or similar cartridges when it comes to *drop*, but in terms of *wind deflection*... the .308 shooter has to work a lot harder. Run the numbers, as you say.
Monte
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Jon Lester</div><div class="ubbcode-body">Mark, we run the 155 lapuas in our 308s @ 2930. If you run the #s on this, at ASC we get 8.3 mills to 1000. That is inside a large percentage of 260 stuff and you saw te performance in Brads 308. </div></div>
Jon,
It doesn't matter whose 155 you run, or at what speed. You may hang with a .260 or similar cartridges when it comes to *drop*, but in terms of *wind deflection*... the .308 shooter has to work a lot harder. Run the numbers, as you say.
Monte
