Shooting a dead horse w a 30BR

[Link]

All we seemed to hear was hard JAM - JAM the 30BR.
How many of you practice JAM? Yay or Neigh. ;}

 

[Schippergreg]

I’ve got one that shoots best @ .002 off touch with both 115 10x and 112x-outs. That barrel just doesn’t like a jam, I’ve tried it.

 

[Rwfish]

My groups were more consistent with just touching. 118gr -10o bibs, Bat 3l kreiger chambered by H.Rivers..

 

[Ron IA]

hard jam = powder in the chamber and trigger if you have a bad primer or forget to put one in, I have watched way too many shooters go out of the running because of it. a 5or 10 tho. jam is all you need That's what I think about it

 

[TIMO]

"Rama-Lama-Jama", hope I quoted that correctly.
That is what has worked on my rifles.
Just my .02

Tim

 

[JEFFPPC]

So Link. Is jam and touch the same thing? Does neck tension enter this conversation? Is jam repeatable? I cringe every time I hear the term jam.

 

[Webster]

So Link. Is jam and touch the same thing? Does neck tension enter this conversation? Is jam repeatable? I cringe every time I hear the term jam.

All the guys that recommend jam don't mention that if you have to open the bolt with a loaded round you will probably dump powder all over the chamber and trigger area. Then your at the bottom of the list.

 

[Kyle Schultz]

All we seemed to hear was hard JAM - JAM the 30BR.
How many of you practice JAM? Yay or Neigh. ;}

I'm 0.031" into the lands from touch. And the gun shoots great.

 

[Kyle Schultz]

All the guys that recommend jam don't mention that if you have to open the bolt with a loaded round you will probably dump powder all over the chamber and trigger area. Then your at the bottom of the list.

With respect, this statement is inaccurate. During a match, if the emergency cease fire command is given, if the MD deems it safe, you will be instructed to clear the gun by firing. If it is unsafe downrange, let's say, a deer wanders onto the range, you will normally be given the option to unlock your bolt but not try to extract. If you have a failure to fire situation, the standard procedure is to remove the rifle from the bench, take it to safe place, and attempt to clear the round.

I use a neck bushing 0.004" smaller than the loaded case neck.

All this said, in 10+ years of shooting the 30BR, I've inadvertently extracted rounds maybe a dozen times with no issue. But I have dumped powder once or twice. I'll concede it's a mess but, imo, the accuracy gained by a hard jam makes the risk warranted. Good luck.

 

[Mark W]

So Link. Is jam and touch the same thing? Does neck tension enter this conversation? Is jam repeatable? I cringe every time I hear the term jam.

IMO no, yes, yes.

 

[GetReal]

Last I heard, jamming was bad ju ju. You could blow up the whole universe by jamming.

Last I heard...

 

[Link]

JEFFPPC said:
So Link. Is jam and touch the same thing? Does neck tension enter this conversation? Is jam repeatable? I cringe every time I hear the term jam.

Hi JEFFPPC, That's another ''dead horse'' I guess. I guess it doesn't matter what you call it or how you get there as long [or short] as you know where you started at?
Again, I'm guessing neck tension would be part of the equation?
So JAM on .

 

[DaWhit]

Hard jam, I have to clean after every card or every other. Jammed 10 thou in, the gun will stay in for the match. This barrel definitely prefers jammed.

 

[Infrequent Shooter]

not a 30 BR but one of these days I am going to find a powder puff 308 load w some 110-130gr. I want to shoot it in my 30year old mint condition Tikka 590. only about 40 degrees off topic....

 

[searcher]

Foremost, whether to jam is going to depend on whether your accuracy gain is meaningful. In a few of my rifles (30BR and 6 Dasher), jam is best and I moly my bullets to minimize possibility of dumping powder if a live round is extracted, potentially pulling the bullet. Have never dumped a case using moly. But moly has its own minor drawback - in those 2 barrels, I need to fire at least five "foulers" before I 100% trust my impacts. For the amount of accuracy gain in those barrels by jamming - it is a worthwhile tradeoff.

 

[JEFFPPC]

IMO no, yes, yes.

I agree with 1and 2. Not three. I would need to see someone do jam by whatever method and get the same answer 3 times in a row. If you can good but twice I have had guys going to show me and Waugh, Wauugh, Wauuugh. Lol. If is works for you great.I like touch because I can see it, every time. You and I can compare with touch a1000 miles from each other. I don't believe we can with jam. Just my conviction.

 

[DShortt]

Never understood the concept of jam plus whatever thousandths.
Someone want to clarify that with a repeatable measurement? Because jam seems to indicate it won't move any further unless I don't understand English.

 

[TIMO]

"Rama-Lama-Jama", hope I quoted that correctly.
That is what has worked on my rifles.
Just my .02

Tim

Check out Bib Bullets, for some additional reading.

RG’s thoughts & Stuff

Getting the most out of a .30 Caliber competition rifle, intended for use with short/light for caliber bullets is pretty simple: here, we’ll look @ 30x47HBR shoulder bumping & bullet seat…

bibullets.com

Tim

 

[Shooter13]

"Rama-Lama-Jama", hope I quoted that correctly.
That is what has worked on my rifles.
Just my .02

Tim

Same as on mine. RG is where I get all my 30BR info! THE source!

 

[LVLAaron]

I prefer a good Marmalade