| Posted: Fri Nov 6th, 2009 05:19 PM |
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GottaGetaGlock
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I just started loading for a Rem 700 PSS is .308. The pic shows a Federal GMM 168 BTHP load, my handload with the Sierra 168 BTHP just touching the lands, and the same bullet for comparison. As you can see the bullet is barely in the case with my load.
Cartridge OAL: Fed 2.801, my load 2.966.
My question is does that seem like too much freebore?
My load does shoot well with the limited testing I have done.
Attachment: IMG_0432.JPG (Downloaded 34 times)
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| Posted: Fri Nov 6th, 2009 08:12 PM |
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miestro_jerry
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In my bolt guns, the OAL is not as big a factor as my M1A. You may have a problem with not enough of the bullet gripped in the case to have a enough time for thorough combustion after ignition of the powder before the bullet leaves the case traveliong into the barrel.
Otherwise if it works for you and you see no chamber scaring or other damage, then you may want to continue to shoot these loads. I just like to be to spec on my reloads, fewer problems for me.
Jerry
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| Posted: Fri Nov 6th, 2009 08:39 PM |
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GottaGetaGlock
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miestro_jerry wrote: In my bolt guns, the OAL is not as big a factor as my M1A. You may have a problem with not enough of the bullet gripped in the case to have a enough time for thorough combustion after ignition of the powder before the bullet leaves the case traveliong into the barrel.
Otherwise if it works for you and you see no chamber scaring or other damage, then you may want to continue to shoot these loads. I just like to be to spec on my reloads, fewer problems for me.
Jerry
How can I check for chamber scaring?
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| Posted: Fri Nov 6th, 2009 10:22 PM |
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OldStuffer
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I would want a bit more case grip, but, you won't get much without getting well back from the rifling.
I don't like to seat contacting the rifling, as your post seems to read you are seating those.
I would back them in 30-thousandths or so. This will give them a lot more grip in the case, and a bit of a "jump" to get moving before they hit the drag of the rifling cutting into them, helps ease the bullet getting into the rifling, supposedly lowering pressures somewhat. Making the bullet start out touching the rifling causes a need for far more case pressure to get the bullet moving, like it's against a partial blockage already.
That short of a setback should not harm accuracy in a meaningful manner.
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| Posted: Fri Nov 6th, 2009 10:39 PM |
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Busted
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"My load does shoot well with the limited testing I have done."
It would appear your "freebore" is okay. ??
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| Posted: Fri Nov 6th, 2009 11:38 PM |
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GottaGetaGlock
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Thanks for the replys. I'm going to do some more experimenting and see what happens.
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| Posted: Fri Nov 6th, 2009 11:39 PM |
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miestro_jerry
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If you are not shooting Camp Perry National Match quality with your riflr moving the bullet back shouldn't cause any problems.
I use a "light pipe" to check chambers with, but if I have a real problem or question I go have that rifle check out with a bore scope.
Jerry
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| Posted: Sat Nov 7th, 2009 12:57 AM |
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fryboy
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i have one ... in a 6mm with my fav noslers ( 55 bt bt's) that i have even less in the case lolz umm btw ? it works for this one gun the main thing is to be enough off the rifling that u dont eject a unfired round and the bullet stays in the bore ( and however many grains of powder is umm everywhere u dont want it to be , i realize that i could load a longer heavier bullet but that lil dude just thumps ,the one problem with this is as the rifling wears the freebore will increase ,IMO the heavy barreled 308's are more for precision shooting of heavier bullets ,these would give u more case grip as well and while velocity will be lower they will actually do better at longer range ( better b.c. and s.d. )if ya get bored u mite try something in the 180-200 grain range
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| Posted: Sat Nov 7th, 2009 01:23 AM |
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Dragon88
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My Rem 700 has a very long throat as well, and I've dealt with this same dilemma. I decided that I didn't want the bullet sitting that far out of the neck. You can just imagine one of the rounds getting bumped a little in transit to the range and having the bullet knocked crooked, there's so little contact with the neck. I decided on a length of 2.860", which is .055" short of the lands. Still easily a sub MOA load.
You might also try out the 175gr SMK, they are longer and help me get closer to the lands. More importantly they are very accurate, same bullet as in the military's 7.62x51 sniper round.
Last edited on Sat Nov 7th, 2009 01:25 AM by Dragon88
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GottaGetaGlock
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I found this pic of some .308 target bullets on 6mmbr.com. I will probably try one of the longer ones in this lineup. Attachment: 308linex580.jpg (Downloaded 22 times)
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fryboy
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doesnt that 210 look wicked ? the nosler looks like it also has just about a long bearing surface as the 210,6mmbr.com is a great site ! in a weird sense ... ye old round noses often engage the rifling sooner in obscenely freebored things ..under a couple hundred yards it doesnt much matter... i say weird because it seems that boat tails benefit more from hitting the lands sooner ...lolz
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Rockydog
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GGG, A good rule of thumb is a minimum of one caliber's engagement in the case. Any less and it can tip and run out can get very unpredictable. RD
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GottaGetaGlock
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Rockydog wrote: GGG, A good rule of thumb is a minimum of one caliber's engagement in the case. Any less and it can tip and run out can get very unpredictable. RD
Thats what I was afraid of. I was very careful when I took the few rounds with me when I went to the range. After I have my cases fireformed, I should be able to get good accuracy with some bullet jump. I've got 40 more cases loaded like the first pic for fireforming. After that I'll set 'em back some.
That Nosler in the pic does look pretty good though. I've shot Nosler BT's years ago in a 7mm mag and they were very accurate.
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