Home Forums Reloading Big Game Rifles 7_08 Velocity

I get your drift, but it is quite possible for two loads producing the same velocity to have different peak pressures. Similarly it is quite possible for two loads having the same peak pressure to produce different velocities.

Not directly it won't. That's what you're not getting. The work done is area under a pressure-volume curve.

mathman, that was not directed to you.

'slim, by default this is about bullets as one component of the subject.

You stated you may be a little over pressure at ~3350, I am guilty of pushing 61-63K psi close to 68K psi, I don't think I have hit over 70K but I damn sure have no intention of pushing it into the mid-80's.

A running start increases velocity, a slicker bullet increases velocity with more powder, higher peak pressure under a longer curve increases velocity; and, higher peak pressure can increase velocity.

I think all who have commented on the velocity you are achieving now and in the past, are showing concern, take it for what it's worth.

Natural selection at work here, folks.

Slim,

SOME powders produce the highest velocities in SOME cartridges. While some of those are newer powders, some aren't--and so far there's always some other compromise being made.

"The" Superformance powder in various Hornady factory loads is actually several different blends of similar powders, each formulated to produce the most velocity in a specific cartridge, or even a certain cartridge/bullet combination. The Superformance sold to handloaders is the .30-06 blend, and yes, it does produce more velocity in certain specific instances. But that's been going on for a long time, with a lot of different powders.

If you check out loading data for various cartridges, there are always certain powders that produce the most velocity in certain combinations. IMR4350 is now 75 years old, and its still at or near the top for certain applications, despite being a single-base powder.

A few years ago Reloder 17 was supposed to be the new magic super-velocity powder. That lasted until Alliant published actual pressure-tested data. While RL-17 does do very well in specific instance, so do many other powders. In fact, it turned out that even some of Alliant's other powders beat RL-17.

One other interesting fact that can be learned from actual pressure testing, instead of the pressure guessing many handloaders (like you) depend on, is how often traditional "pressure signs" don't show up until 70,000 PSI or even 75,000 psi. And that's in temperature- and-humiditycontrolled laboratories, not out in the real world where it isn't always 70 degrees, and the bore may have some moisture inside.

That's exactly why SAAMI standards leave some wiggle room. They don't want some handloader running pressures up to the absolute max, and then when conditions change their "safe" load somehow isn't as safe as it seemed the day they worked it up.

Slim,

SOME powders produce the highest velocities in SOME cartridges. While some of those are newer powders, some aren't--and so far there's always some other compromise being made.

"The" Superformance powder in various Hornady factory loads is actually several different blends of similar powders, each formulated to produce the most velocity in a specific cartridge, or even a certain cartridge/bullet combination. The Superformance sold to handloaders is the .30-06 blend, and yes, it does produce more velocity in certain specific instances. But that's been going on for a long time, with a lot of different powders.

If you check out loading data for various cartridges, there are always certain powders that produce the most velocity in certain combinations. IMR4350 is now 75 years old, and its still at or near the top for certain applications, despite being a single-base powder.

A few years ago Reloder 17 was supposed to be the new magic super-velocity powder. That lasted until Alliant published actual pressure-tested data. While RL-17 does do very well in specific instance, so do many other powders. In fact, it turned out that even some of Alliant's other powders beat RL-17.

One other interesting fact that can be learned from actual pressure testing, instead of the pressure guessing many handloaders (like you) depend on, is how often traditional "pressure signs" don't show up until 70,000 PSI or even 75,000 psi. And that's in temperature- and-humiditycontrolled laboratories, not out in the real world where it isn't always 70 degrees, and the bore may have some moisture inside.

That's exactly why SAAMI standards leave some wiggle room. They don't want some handloader running pressures up to the absolute max, and then when conditions change their "safe" load somehow isn't as safe as it seemed the day they worked it up.

Either the pressure is enough to flatten a primer, or it isn't ( all else being equal) if that isn't the case, I would love to why.

You are just sore that none of the improvement benefit long actions

Your post speaks to your character. How original. Neeeever heard that one on the forums before

Are you saying I'm a Darwinist?

Really? Why is that?

How much pressure does it take to flatten a primer, and are all primers equally resistant to deformation?

.... I have never seen anything on primers in controlled conditions.

Pushing a 120 TTSX another 200 FPS gets you 7" less drop, 2" less drift, and an additional 154 FPE at the 500 yard line.

Not even worth the [bleep] effort...