Barnes load data

[bighorn1]

So for curiosity I bought some factory loaded ammo from Barnes. I have already developed my pet load using barnes data and have a winner.

According to the manual that i have ( version 3 ), MAX LOAD data for 300 WSM with 150 gr tsx with any given powder is 75 gr of h4831 and that is pushing a compresed load.

So i decided to pull a bullet and check out what the factory was running and my findings blew my mind. i ended up with ( not sure what powder there running but it is flake not kernal ) 80.7 gr of powder !!

Now the scale is not out of whack either as i thought it was after these findings so i weighed some 150 gr lead and they were all within reason.

i was really at a loss so i pulled a half dozen out of that box pulled the bullets and they are consistantly just over 80gr.

my question is if we are loading factory ammo that hot why does the max load with any given powder in the load data publush at 75?

no signs of presure and the factory loads shoot well , just not quite like the home built version but why so hot for factory ammo?

[Faststeel]

H
There is no TSX data in the Barnes manual 3.

Likely they are using slower powder, and slower powder requiires a greater volume for speed.

All manuals are published to be safe in most every rifle. Many experienced hand loaders will tell you in there pet loads with some calibers and bullets are quite a bit stouter than the what the manual says. I have a load in my 257 AI that is 4 gr over book max. FS

[sikwhiskey]

Manufacteres use different powders/blends that are not available to the public.

Any idea of the velocity of the factory rnds? What is listed in there manuals is "safe" only in the rifle they used in testing, and can and will vary in other firearms. Start low and work up, velocity can give you a better idea of pressures than most other indicators. Cronographs are a handy tool

[elkhunter11]

It's very simple, they use a different powder, so the amount that is used is different.Just because the powder charge is heavier by weight, doesn't mean that it is any "hotter".