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155 sierra palma

badshooter

Sergeant
Full Member
Minuteman
Feb 5, 2008
242
0
42
South Arkansas
I am currently loading the 155SMK (the old style) in my SPS-T. With this being a factory remmy, it has a mile long throat. Does the new 155Palma SMK work okay with a long throated rifle? I wanted to try some for the added BC, but I cant load them to the lands in this rifle.
 
Re: 155 sierra palma

The new one takes a longer OAL in order to get the ogive out to the lands. My old 2155 loads have an OAL that is below 2.800; with the new 2156 loads are over 2.800. So no, the new 2156 will not reduce your OAL when attempting to reach the lands in your rifle.

That being said, people have been getting good results jumping the 2156 up to .080". I have a load at .010" off the lands right now I am not happy with the accuracy and am going to shorten the OAL another .010".
 
Re: 155 sierra palma

I have heard that the 155 palma round needed a faster twist to stabilize for the long distance shots. That is faster than 1:12, has anyone heard or have experience with this round that can shed some light on this?

What twist do you have, what length barrel, at what velocity?

I've recently picked up a Rem 700 5R, and will be looking at different loads as I move out to further distances.

Thanks for any help,

Seekers

 
Re: 155 sierra palma

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Seekers</div><div class="ubbcode-body">I have heard that the 155 palma round needed a faster twist to stabilize for the long distance shots. That is faster than 1:12, has anyone heard or have experience with this round that can shed some light on this?

What twist do you have, what length barrel, at what velocity?

I've recently picked up a Rem 700 5R, and will be looking at different loads as I move out to further distances.

Thanks for any help,

Seekers

</div></div>
I'd be interested in others experience with these Palma bullets as well. I just ordered another 500 and they haven't arrived yet but the few I tried with my initial development loads were not stellar, especially at the hotter loadings. If others are not getting as good results as they are with the 168s and 175s - I may just send them back to exchange for some more Hornady 168 AMAXs.

FWIW, I'm shooting a 20" SPS-T and maybe the combo of twist rate and barrel length is not optimum for the Palma bullets. I'm going to try to seat bullets to a longer OAL and see what that does.
 
Re: 155 sierra palma

You heard wrong. It was designed to be a direct interchange with the current 2155 bullet in existing 13 and 14 twist PALMA barrels - read that as 28" and longer.

That said, I have not shot them in a 20" 13 twist barrel. I have in a 30" 13 twist and a in a 23.5" 12 twist with no problems.
 
Re: 155 sierra palma

How much difference could you expect between the 155 palma bullet and the 155 scenar? besides cost of course.

How many people are using the 155 palma in rifles under 1:12 with barrels 24" or under with what they consider good results. Is this considered a normal load, like the 168 and 175 or more experimental, with mixed results?

thanks for any help with this,

Seekers
 
Re: 155 sierra palma

I can't get either Sierra nor Lapua 155 to shoot through my 20" 1-12 barrel. They do shoot .5 moa through my 25" 1-12 with the same load. The only thing I can come up with is the extra 5" to get them up to 2800fps. I have always been told that the 155 like to go fast.
 
Re: 155 sierra palma

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Emilio</div><div class="ubbcode-body">I can't get either Sierra nor Lapua 155 to shoot through my 20" 1-12 barrel. They do shoot .5 moa through my 25" 1-12 with the same load. The only thing I can come up with is the extra 5" to get them up to 2800fps. I have always been told that the 155 like to go fast.</div></div>
Same here Emilio,my 19.5" 1-10 twist barrel doesnt seem to punch good groups and my M40a3 1-12 25" barrel will get them in one hole at 200, 4" at 600.Im using same load for both 155scenars 46.5 varget 210m Lapua brass 2.214 ojive 2.853 oal
 
Re: 155 sierra palma

Based on the data in Brian Litz's book, the new Sierra 155 Palma (2156) is dimensionally quite different from the old version (2155). Of particular note with regard to stability/and twist is that the OAL of the new bullet is 1.210 where the old one is 1.131. The Lapua is longer than both at 1.291. Brian's experimental G1 BC results still have the Lapua in the lead at .462 with the new Sierra at .449 and the old Sierra at .417.

As for me I've got lots of the old Sierra 155s on the shelf and won't be making any changes soon.
 
Re: 155 sierra palma

All three bullets 155 grain, Sierra bullets are the 155 Palma.

BC, Ballistic Coefficient

old bullet Sierra 5155C BC = 0.450

new bullet Sierra 5156C BC = 0.504 list price midway @30.99

Lapua Scenar PL7073 BC = 0.508 list price midway $42.99

New Sierra is VERY close as NineHotel has shown with his actual experience with these. I'd have to ask if he thinks the price difference is worth it though, between the new palma and scenar's? I don't know if you get a price break with a quantity purchase or not which would sure help and I'm not saying that Midway is the best or cheapest place to buy. Just the first place that had both for comparison.


Thanks,

Seekers
 
Re: 155 sierra palma

Damn! I just bought a box of 500 of the 155 palma's and I don't think its going to shoot out of my SPS-Tac 20" very well.

Oh well, that's what I get for not doing my homework before hitting the "pay now" button at Natchez.
 
Re: 155 sierra palma

I was about to push that "buy it now" on some SMK 175 but have been hearing about the advantage of the 155's. Being able to push them 200-300 fps faster making up for the BC difference. I'm hoping to find out for sure if mine (5R) will work so I don't make a mistake.

good luck with yours,

Seekers
 
Re: 155 sierra palma

I tried some of the 2156 Palma's today at the range. Results, not good. The 20" tac barrel could only get a 3" group at 200yds. I tried 3 different loads of RE15, 45.5, 46.0 and 46.5. MV from 2700 to 2780. I might try some Varget or a little more RE15, but I am already way over max.
 
Re: 155 sierra palma

I shoot the 155 Palma from my 20" remmy 1-12" .308 and i have had great luck. I get better accuracy with the 155 Palma than the SMK 168, or the SGK 165 out to 200 (haven't gone any farther). However, i am skeptical about using them for hunting.

155 SMK Palma
44.5 Gr. Varget
2.850" OAL
 
Re: 155 sierra palma

Got some of the 2156 2nd's. from factory store before they were in general release. Bought 500 and would estimate 20% of them didn't get pointed correctly (my understanding is they are the same bullet as 2155 but run through a bullet pointer) and were the same profile as the 2155 which shoot great out of my LR-308. Chapped me a little to pay 2156 prices for 2155 even if they were 2nd's.

I had similar results as NineHotel, compared very close to the 155 Scenar out to 850 yd. Out of Krieger 24" 1 in 11 at 2850. When I hand picked through the bullets for profile and weighed them, the performance was very close to the scenar. The 2156 didn't shoot well through the LR-308, opened groups up almost double.
 
Re: 155 sierra palma

I'm currently working on a load for the 2156 out of my 700 sps varmint. best I've been able to do so far was 3 round group .287" at 100yds.

26" 1/12twist
rem virgin brass
45.5gr varget
2.820 COL
CCI-BR2

I'm very happy with that group for a stock remmy, but I still need to repeat it a few times to be sure. I'd also like to get the velocity up a bit if i can. at 46grs the group opened way up. if pressure remains under control I will be trying up to 48gr, at .3 at a time looking for another accuracy node.
 
Re: 155 sierra palma

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: garrett1107</div><div class="ubbcode-body">I shoot the 155 Palma from my 20" remmy 1-12" .308 and i have had great luck. I get better accuracy with the 155 Palma than the SMK 168, or the SGK 165 out to 200 (haven't gone any farther). However, i am skeptical about using them for hunting.

155 SMK Palma
44.5 Gr. Varget
2.850" OAL </div></div>

That's awfully light. My load is 47. One guy on here was even hotter than me (I won't even post the number, but it was too hot).
 
Re: 155 sierra palma

I am also trying the new 155 Palma SMK. Initial testing looks promising. Shot with 4 diff powders, R15, TAC, Varget and H4895(my fave). 46gr of R15, Varget and TAC, gave so so accuracy with TAC giving highest velocity, but most vertical 2900fps+, R15 and Varget were about the same velocity-wise, ~2800fps.

H4895 is giving me the best performance so far, tested 45-45.6grs, all giving me under an inch @ 200yds. Velocity around 2850 +/- 15fps.

Rifle - SPS-V 1-12tw 26in.
2.885 OAL
Brass FGMM 3x fired, CCI LR primer.

Hope that helps someone.

SY
 
Re: 155 sierra palma

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: SYK</div><div class="ubbcode-body">I am also trying the new 155 Palma SMK. Initial testing looks promising. Shot with 4 diff powders, R15, TAC, Varget and H4895(my fave). 46gr of R15, Varget and TAC, gave so so accuracy with TAC giving highest velocity, but most vertical 2900fps+, R15 and Varget were about the same velocity-wise, ~2800fps.

H4895 is giving me the best performance so far, tested 45-45.6grs, all giving me under an inch @ 200yds. Velocity around 2850 +/- 15fps.

Rifle - SPS-V 1-12tw 26in.
2.885 OAL
Brass FGMM 3x fired, CCI LR primer.

Hope that helps someone.

SY </div></div>

Not sure how far you're planning on shooting, but you've got a long way to go in your workup if you're only getting 2850 fps from a 26".
 
Re: 155 sierra palma

Downzero,
Velocity wise I can push it, but right now am looking for accuracy. WIth 46gr TAC, it showed 2940fps on the chrony, 3k fps is possible, but TAC also gave the most verical.
This rifle is a factory action and barrel, with 5k rounds thru it so far. What would you consider a good velocity to shoot for? Am shooting mostly at 600yds btw.

Seekers,
I never shot them at 100yds, started at 200. Will have a chance to stretch them out today at practice. Will let you know.

SY
 
Re: 155 sierra palma

If you're looking for accuracy, my suggestion is to lose the ball powder and choose one of the more popular stick powders. Ball powder is for bulk ammo.

My 47 grains of Varget got me 2899 FPS average with single digit standard deviations (I think something like 9). Perhaps I can push it a little harder, but I'm pretty sure that any rifle with those kinds of numbers will shoot better than I can.

My barrel is a 24", so I'd suggest that without even pushing the pressure limit, you should be able to get 2940 +/- a few fps with your longer tube.
 
Re: 155 sierra palma

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Bronco</div><div class="ubbcode-body">Got some of the 2156 2nd's. from factory store before they were in general release. Bought 500 and would estimate 20% of them didn't get pointed correctly (my understanding is they are the same bullet as 2155 but run through a bullet pointer) and were the same profile as the 2155 which shoot great out of my LR-308. Chapped me a little to pay 2156 prices for 2155 even if they were 2nd's.

I had similar results as NineHotel, compared very close to the 155 Scenar out to 850 yd. Out of Krieger 24" 1 in 11 at 2850. When I hand picked through the bullets for profile and weighed them, the performance was very close to the scenar. The 2156 didn't shoot well through the LR-308, opened groups up almost double. </div></div>

I dont shoot Scenars and I dont shoot my Palma bullets out of a tactical rifle, I shoot them out of a 30 inch 1/13 Palma bbl, either Lilja or Kreiger, so I preface my comments with that.

The 2156 is NOT the same bullet as the 2155. Yes, its pointed, while the 2155 is not, but the shapes are not even close to being the same.

Keep in mind that the Palma bullets are designed for Palma shooting, specifically, thus the name. If you know what Palma competition is, you know we shoot only 800, 900 and 1000 yards. Thus, the bullet was designed to go, and to perform, at 2930fps or faster and out of a 1/13 twist bbl. Why faster than 2930fps? Cause you gotta keep that baby supersonic when shooting at 1,000. So, I would venture to say that you got a bullet that was designed for Palma it would probably shoot best out of a LONG bbl, ie ~30 inches, a 1/13 twist, and because at some venues you cant have rounds that get into the lands, by jumping (which coincidentally, most SMKs prefer anyhow) them.

So, I am basically saying that its an awesome bullet, designed for a specific task, and as such, for specific speed/bbl/twist combos so if it doesnt work in a 20 inch tactical bbl with a 1/11 twist, that might be why.

John
 
Re: 155 sierra palma

An update for Seekers. Shot the 155 Palmas @600yds this past weekend. Shooting an F-class target, shot a 191 in windy conditions. Was pushing it at ~2890fps, seems to work ok.

For Downzero, I am still working up the velocity, using H4895, book max 46gr gave me 2920fps, no pressure sign, need to fine tune some more.

SY