What do you think has the most penetration capability.. A few years ago we did a lot of shooting a 3/4" piece of steel with just about every popular caliber/bullet comparison. Only 1 bullet actually went thru the steel.. What do you think it was??

Very interesting, I have no clue but would like to know.

One kind of bullet or only one caliber of bullet went through the steel?

Only 1 caliber actually went thru.. One almost made it the rest were mere "also shots" Calibers include

220 swift
22-250
243
6mm
270
308

Well besides what caliber you were shooting we will also need ot know the bullets and weights used for this experiment. You could have been shooting a 308 with varmint bullets and a 243 with FMJ. So i would expect the 243 to go through if that was the case. Also what is the 6mm?

It wasn't a scientiffic experiment. Just tyingdifferent whitetail loads that we were sighting in.. So no FMJ.. And this was about 20 years ago and all factory ammo so it wasn't near the amount of choices we have today..

I bet a dime a 308 w/ 165gr AP went through.

Sorry. Bullet weights of the22 Cals were around the 50 Grain weight, 24 Cals were 80-100 and the 270-308 were 150-180 weights.. Again nothing fancy just factory ammo..

Let me add a little more insight.. I wasn't as impressed with whichcaliber that went thru as I was impressed with theWAY it went thru the piece of steel..

Oh yeah.. And there were other calibers... But these are the ones that I know were shot and witnessed..