.308 or .338?

[Goodburbon]

I was under the impression that you were talking about
338 lm in a bolt rifle when i first answered. There is no advantage of .338 fed over .308 for the posted ranges. You may also want to consider .260 though. Unless huting elk b the eventual goal.

[ray1970]

I briefly considered the 260 Remington but heard reports that it could be a bit rough on barrels. I suppose as little as I will probably realistically shoot it I might not wear a barrel out. Heck, even if I did wear one out every four or five years I guess the cost of a new barrel wouldn't be so bad. I'll have to do a little more research on it tonight.

Once again, thank you all for the helpful advice and information. That's why I posted this up here.

I did/am considering the .260.

[MarkCO]

I have only seen it tested with 142 grainers and it was piercing primers left and right.

Sure it was not the 6.5 Creedmore? Those are higher pressure and can have primer problems. That or a just loads that were too hot!

I ran hundreds of pretty stout 142s through my AR-10 .260 with no pressure signs at all. For accuracy reasons, I dropped back to the 123s in the gas gun.

[Hoser]

I have only seen it tested with 142 grainers and it was piercing primers left and right.

That shooter learned his lesson. He was trying to use the same powder charge from his bolt gun ammo to his semi ammo.

One caliber + two different guns = two different loads.

I have a semi (LaRue OBR) in 260. 123s on top of H4350 is perfect. I tried 139/ and you have to seat them so deep you end up eating up all your powder space.

[Tim K]

Ray, I ran dope on Black Hills .308 with the 175 SMK and my .260 load using 123 SMK. It's nearly impossible to post it here without a huge amount of work, but I can easily email them to you. PM me your address if you're interested.

[Tim K]

Got your address, and the dope is on the way. I did it out to 1K yards. Note the difference in drop, velocity, and wind drift. Energy at that range is about a tie, but the .260 will pull away as the distance increases.

I don't know if you can load 175g SMK's for an AR-10. Someone else here will. If 168's happen to be the max, the difference will be much more dramatic.

[ray1970]

Thanks, Tim. Those charts actually pulled up nicely on my phone. I'll give them a good look over in a bit.

[Hoser]

I don't know if you can load 175g SMK's for an AR-10.

Thats the load for Uncle Sams 118LR ammo. Pretty much the 308 Sniper Ammo for bolt guns and gas guns.

[cysoto]

That shooter learned his lesson. He was trying to use the same powder charge from his bolt gun ammo to his semi ammo.

One caliber + two different guns = two different loads.

I have a semi (LaRue OBR) in 260. 123s on top of H4350 is perfect. I tried 139/ and you have to seat them so deep you end up eating up all your powder space.

Yeap, that's the same person I was talking about!

[vectorsc]

Man - you guys are on top of it. Was just going to say .260. LOL.