Jamming vs. barrel life

[marchx]

jamming bullets seems provides best results in 6br and 6.5cm in my experience. Usually I get 0.3-0.4 moa 5-shot group shooting 140gr or 105gr hybrids without any load development at 100m. Just quick obt modelling re powder charge and off we go.

The only question I am askin myself is how much this strategy affects barrel life. Does barrel life expectancy decrease by e.g. 30% or more? My load is usually 30gr N140 for BR and 42gr N555 for NeedMore.

 

[Ccrider]

What do you expect causes more damage to the chamber, slamming the copper bullets moving at high rates of speed into the lands, or pushing the bullets already into the lands through as pressure builds up?

 

[memilanuk]

C. The super hot gasses @ 50-60k psi

 

[RED DIRT]

Temperature of the powder burn is the main problem with barrel life.

 

[whatsupdoc]

What do you expect causes more damage to the chamber, slamming the copper bullets moving at high rates of speed into the lands, or pushing the bullets already into the lands through as pressure builds up?

I really dont think the jump matters its many other factors.

 

[marchx]

What do you expect causes more damage to the chamber, slamming the copper bullets moving at high rates of speed into the lands, or pushing the bullets already into the lands through as pressure builds up?

was thinking about it as well. but, some very experienced local shooters told me recently that by jamming bullets I will increase throat erosion speed by 50%. no idea whether it's true.

 

[boltfluter]

was thinking about it as well. but, some very experienced local shooters told me recently that by jamming bullets I will increase throat erosion speed by 50%. no idea whether it's true.

I would like to hear the logic behind this theory. Just curious.
Paul

 

[JLT]

I would like to hear the logic behind this theory. Just curious.
Paul

The fella's logic is probably rooted in elevated chamber pressure. Jamming into the lands will alter the pressure curve (steeper, immediately subsequent to ignition) but it seems a bit of a stretch to expect this to have material effects on throat erosion. 50% increase in rate of erosion? No way.

 

[Webster]

was thinking about it as well. but, some very experienced local shooters told me recently that by jamming bullets I will increase throat erosion speed by 50%. no idea whether it's true.

Backyard experts.

 

[swd]

I shot thousands of 107 SMK’s in my BRX for F Class around .025” in the lands. Barrels lasted about the same as my friends that shot them off the lands. 107 SMK’s always shoot so well in I don’t even test off..

 

[NZ_Fclass]

I shot thousands of 107 SMK’s in my BRX for F Class around .025” in the lands. Barrels lasted about the same as my friends that shot them off the lands. 107 SMK’s always shoot so well in I don’t even test off..

Shows how some barrels like jam, others....My BR loved Hornady A-Max, jammed =then no more A-Max, so I changed to Sierra. They shoot best 20 thou off. Art beats science?

 

[cwebster]

jamming bullets seems provides best results in 6br and 6.5cm in my experience. Usually I get 0.3-0.4 moa 5-shot group shooting 140gr or 105gr hybrids without any load development at 100m. Just quick obt modelling re powder charge and off we go.

The only question I am askin myself is how much this strategy affects barrel life. Does barrel life expectancy decrease by e.g. 30% or more? My load is usually 30gr N140 for BR and 42gr N555 for NeedMore.

Lets say that jamming will shorten barrel life by a small amount. The question is, would you be willing to sacrifice accuracy for a little more barrel life? I most certainly would not.

 

[swd]

Shows how some barrels like jam, others....My BR loved Hornady A-Max, jammed =then no more A-Max, so I changed to Sierra. They shoot best 20 thou off. Art beats science?

The 6mm 107 SMK is well known for shooting really well in the lands. They also shoot great off but in the lands where the engraving marks are square is always an easy button. It may not be the best but if I’m lazy I can load to 2920 or 3030fps in a BRX at that seating and go to a match and be competitive.

 

[marchx]

The 6mm 107 SMK is well known for shooting really well in the lands. They also shoot great off but in the lands where the engraving marks are square is always an easy button. It may not be the best but if I’m lazy I can load to 2920 or 3030fps in a BRX at that seating and go to a match and be competitive.

I thought I am the only lazy person here.

 

[JEFFPPC]

Swd......same results here I could copy your post as my own. Folks get wild crazy ideas. I never see those guys in the winners list it seems.

 

[Greg@wfcustom]

I would like to hear the logic behind this theory. Just curious.
Paul

Logic??
On the Internet??
Don’t you dare try to bring logic into an emotional argument!
LMFAO
G

 

[urbanrifleman]

It's the fire. It's really hot.

Cuz. It's fire.

 

[gary ocock]

I didn't read the previous posts; but the last few years I jam my bullets into the lands; with the 6ppc short range stuff and I usually end up jamming in my man cave after 4 o'clock listing to music as I stream music while sipping a little tequila; winding down till dinner.

 

[JFrank]

I like jammin mon, hope ya like jammin too.

B Marley..

 

[ebb]

Elevated chamber pressure is BS. Equal powder charges yes jammed will make a little more pressure. If you work up a load to right you are going to find pressure and back down appropriately, so the jammed bullet is going to be a safe pressure just as a jumped bullet, but you are just going to be using less powder to get the right load touching, and more jumping.