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Mr_Logic wrote:What are people's thoughts on this bullet vs lapua 155 or Berger 155.5?

Ta muchly

It is a significantly inferior bullet compared to the Lapua 155 or Berger 155.5 when measured by G7.

The G7 for these three are:
155 2156: 0.229
155 Lapua: 0.236
155.5 Berger 0.237

The harder part to answer is whether you can load and shoot them to a high enough standard to notice the difference in their ballistics.

TJC Given the very small difference in G7 for the two and the significant price hoik between the Lapua and Berger I would agree and certainly would not shoot the Berger right now, in fact if there was parity of cost I would still work with the Scenar as it is such a consistent bullet to work with.

Welcome to the forum BTW.

Thanks for the welcome. Lapua is great if you can push them fast enough. I prefer a shorter barrel so struggle myself. The cost difference mentioned earlier is remarkable. I've just moved to the UK from the US where the difference between a box of 100 is just under 2.5 fine English pounds.

Welcome to the UK, the forum, and the frustrating world of pounds for dollars shooting stuff.

Welcome TJC.

Why not introduce yourself on the new members forum?

TJC wrote:Thanks for the welcome. Lapua is great if you can push them fast enough. I prefer a shorter barrel so struggle myself. The cost difference mentioned earlier is remarkable. I've just moved to the UK from the US where the difference between a box of 100 is just under 2.5 fine English pounds.

I shoot mine through a 24" barrel most of the time and it does struggle at longer distances, 1100 is about maximum for me and I run out of elevation at 1200 unless it is a very warm day as my 'scope only goes to 13.1 mil.

TJC wrote:The harder part to answer is whether you can load and shoot them to a high enough standard to notice the difference in their ballistics.

It's a good question. IMHO for TR it's probably marginal and you're only likely to be able to perceive a difference if you're a top flight shot (see my logic below) however for F-TR and F-Class you may be able to tell the difference more easily given the smaller achievable hold.

If we think about 1000 yards, with a good ammunition/rifle combo your average TR shooter probably holds over 2moa for a ten shot group*. A Palma Team shooter will hold 1 moa, maybe 3/4moa on a good day. The larger the basic group, the harder it is to realistically distinguish whether a wide shot is the result of an error by the shooter or a wind change. For example, if we consider our 2moa shooter, they will not reliably be able to perceive a wind change of less than 1 moa just by looking at where their shots fall**.

Now if we consider the difference between the Berger and the Sierra bullets, which works out a 0.5moa for 10moa wind change (as calculated using the excellent JBM Ballistics page at http://www.jbmballistics.com/) so is going to be less than 1/4moa for your typical 2-3moa wind change at 1000 yards, which just gets swamped by the group size.

Cheers,

Gaz

* Lots of people think they hold better than they actually do. They're generally (but not always) deluding themselves through a mixture of optimism, selective memory and bad plotting. The 1 moa figure comes from a careful examination of all of the GB plots from the 2007 Palma Match.

** This a common cause of people going outside the bullseye one side, making a wind change and immediately going out the other side. The first shot was actually just a wide shot in their group and not actually a wind change.