Personally, I would choose the 125 GMX over the 165 SST if you want to ensure complete penetration. I don't have direct experience with either in .308 but have used a 150 gr SST and 110 gr Barnes TTSX in .270 on a Texas whitetail and a hog. The SST did a tremendous amount of internal damage but left a roughly bullet diameter exit on a behind the shoulder shot. With our much larger deer and a shoulder shot, I wouldn't expect a full pass through. The 110 Barnes TTSX entered a 170 lb. hog from just behind the right ear and lodged just under the skin behind the left hip, penetrating through neck vertebrae, chest cavity, and hip bone for about 34". From what I have read the GMX is a bit tougher than the TTSX.
Huh?
Are you talking 243 bullets? 90gr XTP?
we're talking 30 cal in this thread, right?
Hornady Manufacturing Company :: Bullets :: Handgun :: Choose by Caliber :: .309 30 Cal :: 30 Cal .309 90 gr HP XTP®
Uh, I don't think that bullet is meant for the kind of velocity you would get from a 308 Winchester rifle.
You're not planning to hunt deer with that bullet, are ya?
Meant for M1 carbine velocities maybe?
It's a lot better than a .410 slug.
Depending on the "slug" used, I would actually argue quite strongly against that. The 110gr 30 caliber bullet is less effective, at say 40 yards, than the .410" slug.
Look at it this way: Would you consider the 30 Luger a more powerful handgun than 41 Remington Magnum?
I can't compare the 410 to a 41 magnum. If the 410 shot a 210 grain slug then we might be able to make the comparison to the 41 magnum, however the 1/4 oz or 1/5 oz 410 slugs ARE directly comparable to the mass of the 30 Carbine bullets. And the carbine would have the edge in velocity and sectional density.
1/4 ounce = 109 grains.
I would imagine the .410 and the .30 Carbine are fairly equivalent on deer at short ranges.
Anybody else loading up 30 caliber or 243/6mm loads for deer hunting in Indiana this fall?
That load will be great on deer, OP! Isn't it cool to finally be able to use a normal rifle cartridge for deer hunting in Indiana, even if the regs are still incredibly weird.