|
Forum Rules | Firearms Safety | Firearms Photos | Links | Library | Lost Password | Email Changes |
Register | FAQ | Calendar | Search | Today's Posts | Mark Forums Read |
|
Thread Tools | Search this Thread |
June 9, 2020, 01:49 PM | #26 |
Staff
Join Date: March 4, 2005
Location: Ohio
Posts: 21,013
|
FrankenMauser,
You dropped a zero. 10.19/25.4=0.40118", or 0.4012" with SAAMI rounding (note the SAAMI drawing's 0.4013" maximum is followed by the parenthetical 10.193 millimeters.) All good to go.
__________________
Gunsite Orange Hat Family Member CMP Certified GSM Master Instructor NRA Certified Rifle Instructor NRA Benefactor Member and Golden Eagle |
June 9, 2020, 02:47 PM | #27 |
Senior Member
Join Date: August 25, 2008
Location: In the valley above the plain
Posts: 13,392
|
Damn.
You're right. I had to double check. I even checked both calculators that was I using for conversions, to make sure it wasn't caused by something funky, like a floating point error. And then converted 0.4118" to 10.46 mm, to see if I could have just read the wrong line. Definitely appears to be human error. I'm glad someone caught it, even if my face is a bit red.
__________________
Don't even try it. It's even worse than the internet would lead you to believe. |
June 11, 2020, 09:46 PM | #28 |
Staff
Join Date: March 4, 2005
Location: Ohio
Posts: 21,013
|
Think sunscreen.
Incidentally, it is so easy for humans to fat-finger a conversion, one of the things I really like about the web is you can search on "mm to inch conversion calculator" or conversion between any other pair of equivalent units and get a dozen specialized calculators to choose from. This one gives you all the forms of expression and has a swap button so you can convert in the other direction.
__________________
Gunsite Orange Hat Family Member CMP Certified GSM Master Instructor NRA Certified Rifle Instructor NRA Benefactor Member and Golden Eagle |
June 11, 2020, 10:16 PM | #29 | |
Senior Member
Join Date: November 13, 2006
Posts: 8,270
|
Its possible with low pressure loads to get an incomplete powder burn.
It takes a certain amount of pressure to make a powder light up and burn properly. As you are improvising your own load,perhaps your load is too low pressure to get a proper burn. Unburned powder granules in the chamber will dent the brass,and perhaps get cooked firmly to the chamber walls. You are not using tested data,so,for safety,you are on your own...but parameters that MIGHT make a more complete burn include: A larger charge of powder A hotter primer A roll crimp into a crimp groove in the bullet. Your seater die is likely to be able to crimp. I do not have any data to recomend what is safe.. If your bullet has a crimp groove,that would be the first thing I would try. Beware pursuing subsonic rifle loads without a chronographand with variable and incomplete ignition is a very good way to get a bullet stuck in your rifles barrel. Thats bad enough. Following it with another round into an obstructed bore can go very badly. Good luck! Quote:
Last edited by HiBC; June 11, 2020 at 10:27 PM. |
|
June 14, 2020, 07:32 AM | #30 | |
Senior Member
Join Date: December 26, 2008
Posts: 142
|
Quote:
If it works properly with just a cleaning, I would leave it there. |
|
June 14, 2020, 07:42 AM | #31 |
Senior Member
Join Date: June 17, 2010
Location: Virginia
Posts: 6,867
|
Chamber walls should as polished as reasonably possible.
The old bugaboo of "negative effects of increased bolt thrust" has been disproven time, and time again. (In fact the ability of the case to move freely back against the bolt minimizes case stretch, ...which is actually to your benefit) |
Thread Tools | Search this Thread |
|
|