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by mtngun
Wed Jun 21, 2017 6:04 pm
Forum: General
Topic: Borescopes
Replies: 13
Views: 9894

Re: Borescopes

As I posted on another thread , my Lyman BoreCam is not aging well, with the image getting increasingly dim and splotchy as shown below. There may be some damage to its mirror. Bummer, because it worked satisfactorily when it was new. :cry: http://i.imgur.com/u7knqgj.jpg So I am falling back on my u...
by mtngun
Fri Jun 23, 2017 5:34 pm
Forum: General
Topic: CBA loads
Replies: 105
Views: 22268

Re: CBA loads

An import wind meter showed up. To my surprise it actually seems to work well. At the moment I don't have any "real" wind flags, just pieces of surveyor's tape tied to the 50 yard target posts. With the tape flying at approximately 45 degrees from vertical, the meter reads 4.9 mph. http://...
by mtngun
Sat Jun 24, 2017 6:53 am
Forum: General
Topic: CBA loads
Replies: 105
Views: 22268

Re: CBA loads

Behind the bench at 5 a.m.. No wind or mirage. 8-) Since last time, I increased the torque on the front action screw to 45 in-lb. The rear action screw was left at 35 in-lb. I don't expect the torque settings to make much difference just as long as the screws are not loose, but nonetheless I'd like ...
by mtngun
Sat Jun 24, 2017 7:00 pm
Forum: design & sizing
Topic: Measuring BC's
Replies: 8
Views: 2264

Re: Measuring BC's

30 caliber 124 gr. Loverider.
Image
by mtngun
Sat Jun 24, 2017 7:23 pm
Forum: General
Topic: CBA loads
Replies: 105
Views: 22268

Re: CBA loads

Trying again to test the 124 gr. Loverider BC, this time in the late afternoon. 3 mph breeze, occasional 1/8" jiggle mirage. The useful sensor area on the Shooting Chrony is pretty small, as shown by the dotted line on the photo. You better have confidence in your load if you want to try this a...
by mtngun
Mon Jun 26, 2017 5:02 am
Forum: General
Topic: CBA loads
Replies: 105
Views: 22268

Re: CBA loads

Behind the bench at 5 a.m., but we're having a heatwave and even at 5 a.m. there was 1/8" mirage jiggle. I'm still debating what to do about the carbon fouling problem. The change to IMR8208 and cleaning in between groups definitely has helped, but even with the cleaner burning 8208 there is st...
by mtngun
Tue Jun 27, 2017 12:43 pm
Forum: design & sizing
Topic: Measuring BC's
Replies: 8
Views: 2264

Re: Measuring BC's

Image
by mtngun
Tue Jun 27, 2017 1:55 pm
Forum: General
Topic: CBA loads
Replies: 105
Views: 22268

Re: CBA loads

Today another BC test and a couple of powder tests. This was a bullet made for my 18" twist 30BRs. Since then I have stopped coating GC bullets because, while the coating doesn't hurt anything, it doesn't necessarily help, either. Also since then I have for the most part switched to Loverider d...
by mtngun
Thu Jun 29, 2017 7:42 pm
Forum: General
Topic: CBA loads
Replies: 105
Views: 22268

Re: CBA loads

A couple more powder cleanliness comparisons. The barrel had been brushed after the last session, but just to be sure it was clean I JB'd it before shooting today. The JB patch kept coming out black, and I could feel roughness in the usual spot about 8" from the breech. The roughness went away ...
by mtngun
Wed Jul 26, 2017 9:13 pm
Forum: General
Topic: CBA loads
Replies: 105
Views: 22268

Re: CBA loads

An updated table for "proven cast benchrest loads." It does not include plain base loads, pistol loads, production loads, or military class loads. Generally my criteria for inclusion is a 100 yard 10-shot average of 1.1" or better -- in other words, ten shot MOA. I'll gradually add mo...

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