Recent content by RegionRat

Agree with Pdvdh. Consider that many typical centerfire rifles run somewhere around 50,000 to 60,000 ksi. Sea level atmospheric pressure is roughly 14.7 psi or less than 0.027% of that pressure. So, if the total effect of atmospheric pressure is that small, consider how a change in that...

I have a minute to burn and this is easy if you run these numbers all the time. Let's assume Barnes 208 LRX at typical speeds for the 300 PRC are roughly 2950 fps If the SD is 17, then there will be a probability distribution that says at +/- 2 sigma the ES is 68 fps, and at +/- 3 sigma the ES...

https://www.vihtavuori.com/reloading-data/rifle-reloading/?cartridge=74

In general, book values for ballistic coefficients are only used for estimates to get started. Anything serious requires actual testing in context since barrels can affect bullet drag and in turn the BC. My comment applies to climate and to windage, not just elevation/drop, so testing wind drift...

Then I would check the published recipes and give it a try. If folks are trying to talk you out of VV as a brand, then they are being silly. Their numbering system is a little different, but not hard to understand. A 1XX is a single base, a 5XX is a double base.

Double base powders means that instead of just nitrocellulose they add nitroglycerine. Nitroglycerine adds energy or "heat" to the combustion that can add pressure, wear, and heat. But that is true for all double base powders. There can be some truth to this in terms of how powders can age as...

No, nothing unusual about VV powder compared to other modern smokeless powder. They make single base and double base powders that are competitive with the same versions from other brands. Several VV powders are considered best in class, so I don't understand where those comments are coming from.

Your thread isn't getting much input, so I'll suggest what I would do if I were you (and you don't run GRT or QL). I would contact Tubb directly and see what they say. His daughter and SIL are helping him these days and are very helpful. If they have run TS15.5 they will share it with you. I...

I am taking the liberty of blowing up the photo to zoom in on what @Coyote Shadow Tracker is showing cause I suspect folks are missing what he means. It could stand a few words for a caption to describe what we are seeing?

Agree. I tried to give him some friendly advice not to publish things like that in the open. He is an engineer but what he was doing was irresponsible and my fear is that the disclaimer won't hold up if someone tries to take brass/guns to that pressure and their daddy has a lawyer. When we do...

If you stay in this game long enough, you will find that every brand has some quality escapes, even Lapua. The debate is their batting average, not that any of them are perfect. I have had poor batches from all of them at one time or another because I started young and pre-date the internet...

I have bought the tools on occasion, but for the most part drill and tap my own so that the tooling case is fire-formed and fits snug compared to a standard tool and gives less slop in the measurement. When I start to modify the case, I run the mandrel diameter up in steps till the bullet will...

A 57 grain load should get you close to 2750 with a 22 - 24" bbl. There are typical normal variations on rifles and components, so you have to expect some differences in the outcome, which is why the usual advice to run your own work-up will apply here like anywhere else. If you have been at...

Be careful not to confuse techniques that use a wax or tissue plug, versus ones that fire an actual bullet. Many forming techniques will use a very fast powder, like a shotgun or pistol powder, but they don't push a bullet. Unique is pretty fast for a full size bottleneck cartridge, so be...

Be very careful with original/antique version, versus trapdoor, versus modern version load data. The 45/70 has been around a long time and as a result there is a wide range of difference in the guns that shoot it, starting with weak ones and evolving into modern strong ones. Do your homework on...