There seems to be a question of varying opinion on whether to have a 2000 th jump to the lands and option of bullet touching the lands for best accuracy. What's everyone's thoughts here?
Bullet touching the lands or 2000th back?
- Thread starter skipglo
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Rick Richard
Well-Known Member
It all depends on the bullet and what the rifle likes. In my opinion, there is no one answer for all. Now with that said, most of my rifles like the Berger bullets anywhere from ten to thirty off the lands.
lancetkenyon
Well-Known Member
I have some rifles that like touching the lands, some that like up to a .120" jump.
I even have had same cartridge, same bullet, same powder charge in two separate SAAMI chambers on similar rifles like two totally different seating depths.
I think a majority of rifles like between .020" and .050" jump usually.
I even have had same cartridge, same bullet, same powder charge in two separate SAAMI chambers on similar rifles like two totally different seating depths.
I think a majority of rifles like between .020" and .050" jump usually.
sea2summit
Well-Known Member
.12" off the lands? What caliber/bullet/barrel if you don't mind.
lancetkenyon
Well-Known Member
A .300RUM w. 215 Hybrid. But it likes the 230 Hybrid @ .015" jump. Go figure. I have a few others that like .080" as well.
Sometimes, mag length dictates OAL, and therefore jump to lands.
dok7mm
Well-Known Member
Although some rifles like the bullet touching or jammed in the land, there is always the chance that the bullet will pull out, when extracting a loaded round. You must have very consistent seating depth to prevent dumping your powder into the action. This is why you hardly see the bullet jammed in hunting rifles.
Mikecr
Well-Known Member
This is a local matter, and not a matter of opinion, but of tested best.
Do you mean 2" or .002", or something else?
All...was more the question...lol...but I have found my 6.5 shoots best touching. 300 Weatherby too....338 lapua...still testing. The problem comes in when trying to get a load that works for multiple 6.5s...i talked 5 of buddies into buying 6.5s and this is when a bit of problem arose
I have had to bump the shoulders 2000 and seat back .005 to fit everyone. But my personal best accuracy is on the lands.
.002.. thank you sorry
Thanks everyone...you boys rock!
elkaholic
Well-Known Member
My 30 SM likes the 230 Hybrid about . 013" off the lands. One thing I have noticed is just tickling the lands isn't usually good . 005" off to . 005 jammed is likely better. I also dont like jamming bullets for hunting for reasons mentioned.
aushunter1
Well-Known Member
Its a question that has been asked for eons.
And the answer is...………….is there is no right answer, BUT its whatever projectile you choose suits your rifle with the right powder charge.
If you search this forum the topic has been covered many a time, pretty much reaching the same conclusion...…………………..trial & error is the only way of knowing!
sea2summit
Well-Known Member
Thanks, never heard of one in the .1" range but I'm newish at loading to the lands so here to learn.
I pretty much run everything (with very acceptable accuracy) at .015 to .020. I figure that's close enough. One wonders how much "slop" there is in any given factory rifle/ammo combination. I'll bet it's a mile in some cases, compared to .015. So, with that kind of jump and the way I can get my stuff to shoot at the CBTO's I load, I figure I got it licked. Why touch or jam the lands? I get it if your an F-class guy with a barrel lathe in you living room (which is where mine would go) but if not why beat on your throat?
