Anyone ever compare pressure and velocity

[feddoc]

differences in a .300 win mag shooting 180 Barnes X and Barnes X triple shock?

I have heard that the TS will produce less pressure at the same powder charge, with the same velocity.

Hmm, I hate to try the theory that if some is good, then more must be better, without some data to back it up.

Part of me wants to bump up the load a bit in order to gain a bit more speed, but not at the sacrifice of safety or accuracy.

thanks in advance

[johnch]

In my 30-06 I tryed 150 gr Boat tail ( just found out discontinued for 05) and the 150 gr Triple shock .
I used the same load except for bullet and found that the triple shock were slower, about 100 fps.
Barnes says that the triple shock with the lower bearing area will produce lower pressure.
I have no way of accuratly checking pressure.

[NVMIKE]

I dont see how a lower preasure could get you a faster muzzle velocity, but maybe? I know that w/ moly coated bullets it lowers the preasure, BUT it also lowers the muzzle velocity. You then have to slowly bump up your loads and watch for excessive preasure until your velocity is were you want it.

[KareImp]

I think what you heard is incorrect.

My experience with "Coated" bullets is that they produce less pressure with the same powder charge, so they lose velocity.

Thus, you can increase the powder charge, and should find that the pressure will be the same when the velocity regains the same, as compared to the previously loaded charge.

Pressure and velocity are directly related to one another within reason. The within reason has to do with burn rate of the powder and how long the bullet remains in the barrel, being accellerated to the target. As soon as the bullet leaves the barrel, velocity starts decreasing.

Note I do not have any experience with Barnes X to Barnes X triple shock. Hopefully this helps you.

[stubblejumper]

My experience with "Coated" bullets is that they produce less pressure with the same powder charge, so they lose velocity.

Thus, you can increase the powder charge, and should find that the pressure will be the same when the velocity regains the same, as compared to the previously loaded charge.

Actually testing performed on the barnes xlc bullets has shown that more velocity can be obtained with similar pressures.Pressure vs velocity is not as simple as many people would like to believe.

[James B]

I get higher velocities from the coated bullets of the same weight by using the data in the Barnes manual. They list slightly higher velocity with the coated bullets. I don't see a need to boost the velocity beyond the loads listed by Barnes.

[halcon]

there are books available that explain pressures with different powder and velocity . Velocity and pressure don't always go hand in hand . You can get a good example of this by reading a shotgun loading manual .

[rost495]

Bearing surface is a big factor. Its why our local idiots that thought they knew everything were getting over pressure from original X bullets. They did not look at load data. Simply used same as jacketed bullets. Those can compress some on firing AND for weight are shorter,hence less bearing surface. The more surface you have the more drag you create which increases pressure.

Although I've yet to directly compare TS and regular in the same weight, I can almost guarantee you that the TSX will give less pressure due to design of the driving bands. And if you went as far as to coat or moly them you might even eek out a bit more speed safely.

[HighDesertWolf]

generally I choose a load with the highest velocity with the lowest pressure but not always, lately with my 30-06 loads Ive been lookin at it from another way, lighter powder charges with good performance. Since hodgdon raised the price of their powder, last week I could get a pound of H4895 for $16.95 a pound, this week its $20.95 a pound. And those of you who pay regular retail prices you will notice the same 4 dollar increase if you payed 20 to 21 dollars a pound expect to pay 24 to 25 dollars a pound now.

[rost495]

What I've done to combat prices is that if you shoot a bit during the summer for practice, I'll buy a jug of surplus powder. It usually works super. I load up a bunch of ammo with that and bulk bullets. Use it to shoot with. Then I go back to my full out hunting load and X bullets and check the zero in the fall.

It doesn't work so great for practicing hold overs. But I try not to use holdovers. IF I'm shooting a distance I click it in.

Works well for me. And its the only way I can afford to practice for matches.

If Viht didn't go up in price then Hogdon may be in their realm of prices now. But I want the best performance with hunting ammo and in important matches..