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Old February 21, 2014, 10:27 AM   #39
Derbel McDillet
Senior Member
 
Join Date: September 6, 2013
Posts: 267
Okay, you've convinced me. The "Box O' Truth" link you posted compelled me to do a little more research about 55gr FMJ and the other tests I've found confirm and validate that it's likely to not fragment and penetrate more walls than JSP or JHP.

Now I'll either have to find wall penetration test data for the following loads or perform some of my own wall penetration tests:
Quote:
"In those situations where intermediate barrier penetration is not a critical requirement, for example LE urban entries or long range shots in open conditions, then OTM, JHP, and standard JSP loads can offer acceptable performance. For 1/7 twist barrels, the Hornady 75 gr OTM, Nosler 77 gr OTM, and Sierra 77 gr SMK OTM are all good choices. The experimental BH loaded 100 gr OTM exhibits impressive fragmentation, even at relatively low velocities, however while capable of shooting out to 600, it is optimized for 200 and under. If stuck with 1/9 twist barrels, the heavy 70+ gr loads are not universally accurate in all rifles and the 69 gr SMK OTM, the 68 gr Hornady OTM, the Winchester 64 gr JSP (RA223R2), the Federal 64 gr TRU (T223L) JSP, Hornady 60 gr JSP, are likely to run accurately in the majority of 1/9 twist rifles. Again it is critical to keep in mind that the above loads fail to offer adequate penetration through intermediate barriers."

-- http://pistol-forum.com/showthread.p...-mm-Duty-Loads
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