Paul99354

Back in 2011, I tested WST with my 45 ACP loads (winchester brass; WLP primers; 230 gr RN, FMJ Montana Gold bullets, 4.83 gn WST) for temperature sensitivity. I shot between 18 and 20 rounds each at 3 different cartridge temperatures - 32, 70, and 105 deg F. These were shot with a PACT Mark IV chrono. All rounds were randomly sampled from a large batch of about 1000 rounds I previously reloaded. The 32 deg F rounds were cold soaked in my freezer at 0 deg F, then placed in a cooler with ice for two hours - the temperature in the cooler was 32 deg F when the rounds were shot. The hot rounds were warmed in the sun, then placed in a different cooler containing water at 120 deg F - the temperature in cooler was 105 deg F when the rounds were shot. All rounds were loaded into magazines before tempering to minimize the time between when they were removed from the cooler and when they were shot. The following two plots show the measured velocity versus temperature and the variability in velocity versus temperature. Plot V vs Temp for WST.pdf Variability vs T for WST.pdf I saw a slight drop in velocity (about 5%) at 32 F as compared to 70 F; and somewhat less of a drop at 105 F as compared to 70 F. This was not the inverse temperature response that I was expecting. I don't know if these results are typical. About one month later, using an Oehler 35P, I shot three strings of 30 rounds each, all at 80 deg F, each string under a different set of conditions. These were sampled from the same batch as above. The conditions were (1) tilting the muzzle up before each shot to move the powder to the back of the round; (2) pointing the muzzle down before each shot to move the powder to the front of the round; and (3) keeping the barrel relatively level. The average velocity for (1) was 790 fps with an STD of 1.0% and an ES of 4.8%. The average velocity for (2) was 729 fps with an STD of 1.4% and an ES of 6.0%. The average velocity for (3) was 746 fps with an STD of 1.9% and an ES of 9.5%. STD= standard deviation; ES = extreme spread. The position of the powder in the cartridge made a significant difference in both velocity and variability; I pratical implications of this may be to be aware of how the gun is handled at the chrono station.

I normally double up with Howard Leight soft foam ear plugs under ProEars Gold. But find that setup uncomfortable during long shooting sessions, sometimes hard to hear even with the ProEars amplification turned all the way up, doesn't always seal nicely over the temple pieces of my prescription shooting glasses, and gets in the way of check-weld when shooting a rifle. So, I have been considering buying a pair of Westone (or another company's) custome fit amplified ear plugs. Does anyone have experience with the Westone's (they also make a passive version): DefendEar Digitial DefendEar Hunter Passive

Which Vortex mount works best with the Razor HD Gen II 1-6? The 2" offset mount is supposed to work with eye reliefs up to 4"; the 3" offset for reliefs 4"'and greater.

I just downloaded IPB for the iPhone. I'll report back in a few days. Don't expect an extensive review <smile>.

Brian, Thanks for installing Tapatalk. I am replying using tt on my iPhone - it seems to be working. Paul

Ok, no problem on the schedule - I do understand that this is pretty low priority in the big scheme of things.

Well it's the new year - here is your requested reminder to look into Tapatalk.

Ok, I will bump the thread next year if needed. Happy New Year.

I currently use Tapatalk with Open Carry Forum. I browsed some of the other "Shooting & Firearm" related forums listed in the Tapatalk app and saw 109 forums listed. To be fair, many of these were for airsoft or paintball and some were in foreign languages. Here are a few examples of what I would consider the more relevant sites: northeastshooters.com www.thehighroad.org m4carbine.net xdtalk.com northwestfirearms.com

I just purchased an inexpensive iPhone application for reading forums. Is there any chance that you can install and activate the Tapatalk plugin for the BE forum? For details, see: Tapatalk home page or Tapatalk Forum Owner FAQ

INTJ

In august of 2008, I chrono'd some WWB 230 gn RN in 45ACP purchased from Walmart: 70 deg F, low humidity; STI Trojan, 5" barrel. Average 813.2 fps Median 814.4 Minimum 790.3 Maximum 838.4 ES 48.1 ES % 5.9% STD 12.4 STD% 1.5% n 27 Average PF 187.0

The crack appears to have started from the left side of the slide (the right side of the pictures I posted on 9/19) and propagate towards the top of the slide. The corner appears to be pretty sharp in my pictures, but since I don't have the old slide anymore I can't inspect it more carefully. My new slide looks pretty much the same (at least to my untrained eye).

I paid for shipping to STI. STI did the rebuild and return shipping at their expense.

Here are a couple of more pictures that I took. I had trouble lighting the inside of the slide, so the crack isn't visable - but trust me, it fully penetrated the slide. So what do you think?