I think more room for slower powder is what I'm looking for.
Why is more powder a good thing here?
Do you not have enough capacity from improved Lapua 260 brass?
Hello Wes. I think your question is very relevant. AND you are reading it correctly. If you were to use the strength of the Palma brass in order to run up the pressures, your barrel life will most definitely suffer, compared to "normal" pressures. I am just now almost ready to start load development in earnest with the Palma brass. However, my goal is NOT to run 3000 f.p.s. with 140 VLD's or the 140 LRBT, it is to run 2930"ish" with LESS E.S.s and lower S.D.s so that LONG shot strings may have a better chance of keeping a low vertical dispersion under the stress of a 20+ shot string. If it works, GREAT. However, if it does not, I still have the strongest brass around to shoot many, many loadings with.That's the question I have; just because there is more room in the case it seems the pressure maximums are still relevant in the equation. Just because the case may stand up to more powder/pressure seems the barrel throat is going to be toast a lot sooner under the increased pressure or am I reading this wrong?
I'm just trying to figure out the benefits of all the work involved in re forming the 308 brass.
It's my view that the 260AI represents the perfect capacity for best in 26cal bullets(~140gr).
I don't have that capacity stored on this particular laptop. And there does not seem a lot of chatter about Lapua 260 brass.
So I wonder if there is some issue with Lapua 260 brass. Is the ~2950-3000fps node not being reached with it? Is this with barrels at least 26" long?
If this node IS being reached with it then more capacity would only be a detriment.
Hello Wes. I think your question is very relevant. AND you are reading it correctly. If you were to use the strength of the Palma brass in order to run up the pressures, your barrel life will most definitely suffer, compared to "normal" pressures. I am just now almost ready to start load development in earnest with the Palma brass. However, my goal is NOT to run 3000 f.p.s. with 140 VLD's or the 140 LRBT, it is to run 2930"ish" with LESS E.S.s and lower S.D.s so that LONG shot strings may have a better chance of keeping a low vertical dispersion under the stress of a 20+ shot string. If it works, GREAT. However, if it does not, I still have the strongest brass around to shoot many, many loadings with.
Why is more powder a good thing here?
Do you not have enough capacity from improved Lapua 260 brass?
I know I 'm reaching 2950-3000 with the Fireformed Lapua 260 brass but having said that, it is showing pressure, i.e., flattened primers. I will test some of both tomorrow running near those speeds with the 140 Berger Long Range Boatail.
This is exactly it. If you can hit 2900 with a straight 260 but ragged edge of pressure signs then an AI version should I. Theory be able to hit the same speed with less pressure. Or same speed with same pressure in a short barrel. My last 260 was a 27" barrel and at its peak was running almost exactly 2900. If I could go to a 24 and get the same speed without being over pressure then that a win for me.That's the velocity I want, just lower pressure.
Possibly H4350 is a mite slow to be well lit by SR primers with that case capacity. I've never used anything slower than Varget with similar case capacity calibres, but of course, translating from one to the other ain't exact science.
I bet this is it. H4350 is gonna be hard to ignite with small primers. It ain't Varget.
Palma brass is the way to go with the 260AI. 2930fps keep brass annealed and shoot the same hundred brass for several barrels.Hello Wes. I think your question is very relevant. AND you are reading it correctly. If you were to use the strength of the Palma brass in order to run up the pressures, your barrel life will most definitely suffer, compared to "normal" pressures. I am just now almost ready to start load development in earnest with the Palma brass. However, my goal is NOT to run 3000 f.p.s. with 140 VLD's or the 140 LRBT, it is to run 2930"ish" with LESS E.S.s and lower S.D.s so that LONG shot strings may have a better chance of keeping a low vertical dispersion under the stress of a 20+ shot string. If it works, GREAT. However, if it does not, I still have the strongest brass around to shoot many, many loadings with.
Palma brass is the way to go with the 260AI. 2930fps keep brass annealed and shoot the same hundred brass for several barrels.![]()
On the 5th of this month I was doing some load development with my new 260AI. I use the Lapua Palma brass, Berger 140 hybrids, BR-4 primers with H-4831sc. The rifle has a 30" Bartlein, 8 twist. For some reason it runs ~100 fps slower than other barrels, and today I verified this with my friends Robert's rifle. We have the same chamber so I used two of his rounds in my rifle and I got 96 fps slower results (2,975). Here is some info:Put some MRP into them . The conversation will change .
Larry