The pics above show the results of what happens when a 165grn AP bullet gets squirt out the barrel of a 300WinMag. Only about 300fps more muzzle velocity than that which the 30-06 can accomplish.
Really puts the hurt on that poor plate. Heck, when the plate got hit by 5.56 and lead core 300WinMag it made the usual impact sounds we all associate with bullets hitting steel. But those 165grn AP bullets, the plate was seemingly screaming out in agony and ringing like a tuning fork.
If I could get another 100fps at the time of impact I think I could smoke a hole clean through the plate. I need to test my last load weight for temperature stability though, the pic above was done during temperatures that were about 30 degrees cooler than it is currently. With temps approaching 100+ during this season what was safe at 30degrees cooler may now be showing signs of over pressure.
I'm also going to try some 165grain Barnes Copper Solid SpirePoints. They MIGHT actually provide surprising results if I can get that bullet smoking along fast enough. Sure, steel is the conventional AP load but I can't help but wonder about the Barnes solids, I figure they may liquify and do a good job of making a mess out of the steel due to high temperature moulten copper. It won't be traveling at near the velocity as the copper based AP shape charges but I figure it's worth a try for educational purposes.
Funny thing, after getting my 300WinMag and playing around with that steel plate I couldn't help but think, "If I get 3100-3200fps with 165grainers in the 300WinMag, I wonder what 3300-3500fps from a 300RUM would do?"
Okay, I've rambled enough.