Results 11 to 20 of 39
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29-04-2021, 11:08 #11
- Join Date
- Oct 2012
- Location
- Noord van die biltong gordyn.
- Age
- 56
- Posts
- 9,116
Re: Bullet Jump and its affect regarding Accuracy
While generally true, I have personally experienced an instance where a rifle would just not shoot 2 different bullets from a certain make. Changed to another make and it made very small groups. Same reloading and load development procedure. Then I tried those "inaccurate" bullets in another rifle (same caliber and twist, but different make) and the first try produced a cloverleaf. These bullets do actually shoot, just not in the one particular rifle. What the issue is, I don't know. Then I spoke to a friend who shoots more and better than I do. He was surprized that the second bullet worked at all in the particular rifle. He said he had no good experiences in that caliber with them, but they worked at higher velocities from a bigger case. I guess rifles also have their own personal preferences.
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29-04-2021, 12:38 #12
- Join Date
- Aug 2012
- Location
- Pretoria, South Africa
- Age
- 34
- Posts
- 12,547
Re: Bullet Jump and its affect regarding Accuracy
I've spoken to a few very good gunsmiths in the past, and the general consensus is that "some rifles just don't like some bullets".
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29-04-2021, 14:38 #13
- Join Date
- Aug 2010
- Location
- Port Elizabeth
- Age
- 55
- Posts
- 11,588
Re: Bullet Jump and its affect regarding Accuracy
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29-04-2021, 14:57 #14
- Join Date
- Aug 2010
- Location
- Port Elizabeth
- Age
- 55
- Posts
- 11,588
Re: Bullet Jump and its affect regarding Accuracy
My point is that if the distance ("jump"), measured from the case mouth to the lands is longer than the bullet's bearing surface, accuracy (and precision) will deteriorate significantly.
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yes!
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29-04-2021, 15:43 #15
- Join Date
- Jul 2011
- Location
- BFN Freestate
- Age
- 45
- Posts
- 12,151
Re: Bullet Jump and its affect regarding Accuracy
Theories are all good, until I load my 308 with 110gr bullets and double that weight 220gr bullets and they all group sub MOA.
It kind of kicks dust in the eyes of theories, or maybe that is just the old 308 win.
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29-04-2021, 16:19 #16
- Join Date
- Dec 2010
- Location
- Boland
- Posts
- 7,985
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29-04-2021, 16:28 #17
- Join Date
- Jul 2012
- Posts
- 7,260
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29-04-2021, 16:39 #18
- Join Date
- Aug 2010
- Location
- Port Elizabeth
- Age
- 55
- Posts
- 11,588
Re: Bullet Jump and its affect regarding Accuracy
Thats why the .308 is the legend it is.
Mine shot 130 to 180 perfectly.
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29-04-2021, 17:34 #19
- Join Date
- Jul 2011
- Location
- BFN Freestate
- Age
- 45
- Posts
- 12,151
Re: Bullet Jump and its affect regarding Accuracy
All jokes aside, the 308 is a lesson in internal ballistics few people learn from.
Short powder column, fast burning powder, shoot whatever weight bullet you want, jump or no jump.
It goes full circle to the benchrest crowd that likes jammed bullets, jammed bullets does what?
It increases the shot start pressure, increasing the initial burn stage rate, exactly what the 308 does naturally over most other cartridges.
There is a downside, all 308 reloaders think they are clever, when in reality whatever they load shoots.
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29-04-2021, 18:31 #20
- Join Date
- Dec 2010
- Location
- Boland
- Posts
- 7,985
Re: Bullet Jump and its affect regarding Accuracy
Another, often overlooked reason that bullets got jammed into the lands by Bisley shooters was as a side effect of trying to get as much powder into the 308 case as they could, to extract max performance from the long barrels they used. I had a colleague who shot competitive Bisley that explained this to me.
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