This is a discussion on Polymer Coated bullets within the MP Reloading forums, part of the Smith & Wesson MP Forum category; You need to EXPAND and BELL the case mouth. If the case is not expanded, you can/will swage the bullet down in diameter. If you ...
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|March 4th, 2015, 02:42 AM||#16|
Join Date: Apr 2013
You need to EXPAND and BELL the case mouth. If the case is not expanded, you can/will swage the bullet down in diameter. If you don't bell the case mouth, you will damaged the coating and scrap off some lead. The case ID, over the range the bullet will seat, should be 0.001-0.002" smaller than bullet diameter. Any smaller, and you will swage the bullet down.
I have NEVER needed to change the COL of my as-cast (unsized) lead bullets compared to the same bullet after sizing and always found the as-cast bullet was at least as accurate and almost always more accurate than a sized bullet.
|March 4th, 2015, 06:14 AM||#17|
Join Date: Jul 2011
Location: Northern California
The problem with my M&P 40 and 9mm chambers is that the throat is 0.4015 and 0.3555 respectively. My bullets drop at 0.402" and 0.356". If too much of the vertical part of the bullet extends beyond the rim, the bullets won't pass the plunk test. 80% of the time, they will shoot fine if unsized, but about 2 rounds/magazine, the slide will not fully close because there is too much resistance trying to shove the fat bullet into the narrow throat.
Powder coating adds another 2-3 mils to the diameter of the bullet and makes the feeding problems worse. I originally tried to get away with not sizing them and seating deeper, but I finally "bit the bullet" and got the sizer. Now the bullets all feed 100% even when seated for a long COL.
|April 23rd, 2016, 09:36 AM||#18|
Join Date: Apr 2016
I have been using the coated Bullets from Missouri Bullets for my 10 mm Glock and my 454 Ruger SRH. They are great. Soon will be loading for my new 9mm Shield.
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|June 15th, 2016, 08:33 AM||#19|
Join Date: May 2010
Have added Lyman M Dies to all my die sets.
It's made especially for prepping cases for lead (and coated) bullets.
RCBS (cowboy) dies do the same.
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