Pressure vs heat

[Greatgrandad]

Good. I'm glad you get those big bores out and shoot them 500-1000 times a year so you can be a proficient long range slayer. Stay away from that n570. So It will stay on shelves for me to buy when I need it.

You really seem to be missing the point.

 

[bfarms]

You really seem to be missing the point.

Not really. Although I did learn from you, that I probably shouldn't run n570 in an overbore rifle in a competition shoot. Never woulda thought of that. There's a guy that posed on page 1 and 2. He knows more than you and me. He also saved the bs, and gave a good answers

 

[Greatgrandad]

Not really. Although I did learn from you, that I probably shouldn't run n570 in an overbore rifle in a competition shoot. Never woulda thought of that.

Again, you are confusing the two. Around here, we have a lot of LR/ELR shooters who practice throughout the year for the sole purpose of being proficient during the several hunting seasons and expensive trips, and doing such, we can replace barrels every couple of years or so. Thus, adding a couple of hundred accurate shots to a barrel can save money, time and headaches of rebarreling sooner.

Comp shooting was simply added to make the point that barrels can wear out quicker depending on powders used under more extreme circumstances.

If you only shoot a few rounds a year, it may make little difference to you, as your throat will last for several years.

 

[bfarms]

Again, you are confusing the two. Around here, we have a lot of LR/ELR shooters who practice throughout the year for the sole purpose of being proficient during the several hunting seasons and expensive trips, and doing such, we can replace barrels every couple of years or so. Thus, adding a couple of hundred accurate shots to a barrel can save money, time and headaches of rebarreling sooner.

Comp shooting was simply added to make the point that barrels can wear out quicker depending on powders used under more extreme circumstances.

 

[Greatgrandad]

Sigh....One of those.

Not really. Although I did learn from you, that I probably shouldn't run n570 in an overbore rifle in a competition shoot. Never woulda thought of that. There's a guy that posed on page 1 and 2. He knows more than you and me. He also saved the bs, and gave a good answers

Doubtful, given my decades of experience, education and having owned and operated an ammo business earlier in life. I've spent a lot of time in the shooting world.

 

[bfarms]

Sigh....One of those.

I was thinking the same thing.
At the end of the day let them cool if you wanna save the throat. I torched the last one with rl33 and h50bmg. Obviously some powders are hotter than others. If you let the big boys cool the throat will last a good while. There are So many different variables we could sit here all day and go on about things most could care less about. But the main ones are heat and flame.

 

[Mikecr]

If 4000 is at 60k would it then be possible it's 4100 at 65k?

Yes it's possible.
Powder does not burn at a constant 'standard' in our barrels.
There is a baseline standard, as manufactured, but it varies throughout our pressure curves, in our barrels.
It's just the nature of powder burn.

Competition shooting can see thousands of rounds a year/season.

Or it can be hundreds of rounds -per barrel.
A competitive shooting 6PPC, having a competitive load, won't even reach 1K of accurate barrel life.
This, even while a 6PPC is a really tiny cartridge, burning a small amount of a magic cold powder (N133).
The killer here is shot rate and competitive pressure.