RFI, soft points vs FMJ on steel, what gives?

[BobinNC]

This post has been interesting. At our range we keep ending up with some steel damage during our comps.

We check for M855/SS109. Never would have thought a SP would do damage.

So we have decided run our own test with fresh AR500 steel, and various 55 and 62 gr loads.
Just to see if we need to get more restricted with ammo.

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Perhaps this is in the offing??

https://www.polyfrang.com/5-56-mm-fr...ppressor-safe/

[ViniVidivici]

This post has been interesting. At our range we keep ending up with some steel damage during our comps.

We check for M855/SS109. Never would have thought a SP would do damage.

So we have decided run our own test with fresh AR500 steel, and various 55 and 62 gr loads.
Just to see if we need to get more restricted with ammo.

Sent from my SM-G991U1 using Tapatalk

Outstanding, please do, I eagerly await the results. Yeah this really has been surprising.

I definitely want to see more SPs hitting other plates, to eliminate the possibility of MY plate just being inferior quality.

The only other one I have is a 10" round, it gets used for rifle and pistol, but exact same brand as the other, and bought at the same time.

And no, I personally wouldn't want any of that "polyfrang" stuff.

[bfoosh006]

That's some crazy shit I might do. But you're changing the bullet weight and thus the results would still be speculation if the pocking was gone.

And the lead core could blow out of the jacket.
Leaving the jacket stuck in the bore.

[Disciple]

And the lead core could blow out of the jacket.
Leaving the jacket stuck in the bore.

That was covered up-thread. Sorry for proposing it.

[Piston Driven]

[QUOTE=kerplode;3141604] Deleted

[jsbhike]

This post has been interesting. At our range we keep ending up with some steel damage during our comps.

We check for M855/SS109. Never would have thought a SP would do damage.

So we have decided run our own test with fresh AR500 steel, and various 55 and 62 gr loads.
Just to see if we need to get more restricted with ammo.

Sent from my SM-G991U1 using Tapatalk

M855/SS109 is unlikely to do any more damage/probably less than M193 spec 55gr ball. Copper plated steel stuff is loaded to a low velocity and will do less damage than anything.

There is a decent chance something like a 45gr jhp may surprise you all on target damage.

[Echo40]

I know I'm extremely late to the party on this thread and admittedly I haven't read every post, but seeing as it was recently bumped anyway I'm going to throw in my 2¢ on the matter...

I presume that the soft point bullets in question may have been designed with medium-sized game in mind, ergo a harder lead was used in order to prevent the bullets from fragmenting or deforming too easily for the purpose of yielding maximum penetration.

[tangolima]

FMJ bullet is made by swaging a lead core into a copper cup. Depending on the pointiness of the bullet tip, it is possible that there is a void right under the tip. It wouldn't help energy transfer on hard target.

SP bullet, however, eliminates such possibility.

-TL

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