I ordered some of these & they came today (along with .41 Trooper 215gr SWC-HT I wanted to try too).
They shipped the day after I ordered them & came USPS 2nd Day Priority Parcel. ($14 flat rate shipping fee) They were packaged well.
Dimensionally they look good.
Diameter: .5007" & symmetrical along the bearing surfaces
BOAL: .841"
Seating depth: .525" to crimp groove, .385" to top grease groove.
Avg weight: 397.7gr
They're listed as 18BHN & they do have a flat base with the desired square corners. (The 41's are bevel base.)
These are HT coated red, not my fav but no boggie. The coating on the 500s is a little less uniform than the gold HT coating on the 41s.
I did a acetone wipe test & got some faint red on the white cloth while the 41s didn't show any noticeable gold on the cloth.
Did a smash test, with my 4# hand sledge & compressed them to about half their overal length. The coating seemed to stick better to the 41's. The 500's coating
seemed to crumbled more than the 41's or the 45LC's I got from them earlier in the year.
I plan to put together some moderate loads with them this weekend & try them out next week.
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The coating's tint is actually more maroon than in the pic.
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