Bullet jump. Most amount ever used.
- Thread starter Todd Earhart
- Start date
wildcatter
Silver $$ Contributor
Any target rifle I own, jump has never been where I get my best accuracy. In hunting rifles, touch to .005" off is where I workup most heavy hunting loads. I have loaded over 100 different rifles in my life, and even though I've heard of others jumping bullets, I never have when I'm seeking absolute accuracy.
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divingin
Gold $$ Contributor
Doesn't that happen anyway, what with the case neck expansion? I can't find a decent slo-mo video of a rifle, but the pistol videos I've seen show a huge flame prior to the bullet emerging from the crown, which implies a very substantial amount of blowby.
What exactly do you see happening that would make that scenario unsafe? (Not an argument; just wondering what you're thinking.)
The very first rifle I ever hand loaded for was a Model 710 Remington 30-06. Using 150 gr NABs, I loaded to mag length to start(as I said, this was my very first loading project, so I hadn't checked the land depth), and after going thru the powder range I found a suitable load for hunting that was in the .6-.7" group size range at 100 yards. It wasn't until later on that I decided to check the jump in that rifle, and it was a whopping .150". I didn't change anything tho, as it worked for what I needed it for. 
There is a situation I have run into that brought this question up. I have been working with a marlin 30-30. I have read of people that have used pointed bullets. Loading one in the chamber and one in the magazine. This seemed like a good idea until I started taking measurements. To function the rifle has a max COAL of around 2.550. At this COAL the difference in ogive of round nose to pointed bullet will put the jump to .300+. It just seemed excessive to anything I've loaded before and wanted to see if any have been out this far. I really appreciate all the post and experience.
Todd
Todd
Orr89rocz
Silver $$ Contributor
My 300 wsm at mag length with 180 berger elite hunters shot good for a long while at .209 off. 210 vld at mag length shot good at .125 off.
Had a 6.5 swede mauser that shot good with 130-140 gr stuff but no idea on the lands/throat lengths. Probably pretty long
My 458 win mag shot good with 300 gr hornadys lol long throat for 500 gr solids. Never measured it.
Had a 6.5 swede mauser that shot good with 130-140 gr stuff but no idea on the lands/throat lengths. Probably pretty long
My 458 win mag shot good with 300 gr hornadys lol long throat for 500 gr solids. Never measured it.
centershot
Silver $$ Contributor
I have a .300 H & H Remington classic that just does not want to shoot. I will try loading the bullets in more and see if that will help. Another shooting friend also has one and is experiencing the same thing. Funny thing is that it will shoot better with faster powders.
I shoot barnes and hammers in my 338 RCM and due to mag limits, I jump .1". Rifle still shoots .2"
Cigarcop
Silver $$ Contributor
Obviously U just need a Tuner!!! Lol
Florida Wally
Gold $$ Contributor
Try this video link. It is hard to see, but there is gas coming out of the barrel before the projectile. Put the speed of the video at .25 and you can see it.
wildcatter
Silver $$ Contributor
how often does this happen, and how many shots are you shooting? Because .2" moa groups will win most an precision rifle match, most days! Or is this less than moa.,,, they all shoot a good one now and then.
3 shots. The copper bullets dont seem to be bother by jump as much. I run other rifles at .050 off lands and they shoot as well. A hunting rifle, i couldnt see shooting more than 3
wildcatter
Silver $$ Contributor
That's better than most benchrest rifles will shoot, I don't blame you 3 is plenty.
Thx. I use match grade barrels in everything. I also do tons of testing with hammers and barnes. Accuracy went up when I got away from the plastic tips. I found that there were seldom straight. The Barnes I had on hand had quite a bit of tip wobble and as soon as I went to the HP version, groups reduced 50%. Never looked back. Just started working with the absolute hammers, a bore rider bullet, impressive speeds, more than I expected.
I have found that it's not unusual for a Weatherby Mark V to shoot Barnes X bullets a full 1/4" off the rifling. Accuracy seems to be better there than at lesser jumps.
I have an early Savage LRPV with a 1-12. They usese a reamer on a few early models, that a 105 class would be over .150 out of the case before they touched and the light bullets would be out over 1/4". The factory chamber shot in the .4's. I did have the barrel set back enough and the smith did a no turn neck. All of the Weatherby chambers have a huge jump also.
A bullet in free flight, inside the chamber, with any sort of irregular explosion happenning around the bullet to send it off course into the receiver or feed ramps or chamber wall or barrle shoulder or....
Prolyl would never ever happen. But part of my personality is to imagine / dream up what might go wrong and then think of ways to make sure that can never happen
Them Hammer are the most forgiving bullets for jump I have ever fooled with
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