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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Is too much free bore my problem?
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<blockquote data-quote="birdiemc" data-source="post: 1533320" data-attributes="member: 29632"><p>I have a Rem 700 .308 with factory 20" barrel 1:10 twist, been trying to get it to shoot decent for a couple years now. Out of the box it was 1.5-2 MOA. With or without suppressor, no difference in group size just slight shift in POI. Bedded Talley scope rings, torqued to recommended specs though dont recall now what that was. Lapped rings as they were showing limited contact. I thought maybe changing stocks would help so put it in a magpul hunter, groups opened up a bit and started throwing fliers 6" at 100yds. Pulled it apart checked contact with dykem found some problem areas around rear action screw and magazine, took care of them with a file, no contact on recoil lug except about .030 across the top edge so bedded the lug, still shooting over 2" at 100 yds. Tried different torques on action screws, 70 in/lbs finally brought it back down to where I began 1.5-2" at 100yds. </p><p>I finally got around to cracking open my hornady OAL comparator yesterday and found I have what I consider to be excessive free bore. I forgot to write down what it measured to the lands vs. a factory round but if I recall correctly it was about .210.</p><p>Today I seated everything to the max the magazine would allow and did write that measurement down, its .167 from the lands. </p><p>This is with a 220 gr ELD-X using varget 39.2-40.2 increasing in .2 increments</p><p>2240, 2272, 2275, 2285, 2302, 2337 checked using magnetospeed.</p><p>The accompanying groups with each load varied from 1.2-2", the tightest group was 39.8 and the POI shift from 39.6 to 39.8 was .143, not as good as .121 between first two charges, but looking at velocity, group size, and POI shift it seems 39.7 might be the ideal load. </p><p>Now back to the free bore problem, I'm already at max OAL for the magazine so trying to fine tune with seating depth seems a bit limited, and am I really going to be able to squeeze out an inch with seating depth?</p><p>I searched the history and found this thread below and see where many say this excessive free bore isnt necessarily a problem. So what are your thoughts? </p><p></p><p></p><p><a href="https://www.longrangehunting.com/threads/anyone-deal-w-700-rem-w-long-throat-new-gun-not-shot-out-rem-do-this-on-purpose.120193/page-2" target="_blank">https://www.longrangehunting.com/threads/anyone-deal-w-700-rem-w-long-throat-new-gun-not-shot-out-rem-do-this-on-purpose.120193/page-2</a></p></blockquote><p></p>
[QUOTE="birdiemc, post: 1533320, member: 29632"] I have a Rem 700 .308 with factory 20" barrel 1:10 twist, been trying to get it to shoot decent for a couple years now. Out of the box it was 1.5-2 MOA. With or without suppressor, no difference in group size just slight shift in POI. Bedded Talley scope rings, torqued to recommended specs though dont recall now what that was. Lapped rings as they were showing limited contact. I thought maybe changing stocks would help so put it in a magpul hunter, groups opened up a bit and started throwing fliers 6" at 100yds. Pulled it apart checked contact with dykem found some problem areas around rear action screw and magazine, took care of them with a file, no contact on recoil lug except about .030 across the top edge so bedded the lug, still shooting over 2" at 100 yds. Tried different torques on action screws, 70 in/lbs finally brought it back down to where I began 1.5-2" at 100yds. I finally got around to cracking open my hornady OAL comparator yesterday and found I have what I consider to be excessive free bore. I forgot to write down what it measured to the lands vs. a factory round but if I recall correctly it was about .210. Today I seated everything to the max the magazine would allow and did write that measurement down, its .167 from the lands. This is with a 220 gr ELD-X using varget 39.2-40.2 increasing in .2 increments 2240, 2272, 2275, 2285, 2302, 2337 checked using magnetospeed. The accompanying groups with each load varied from 1.2-2", the tightest group was 39.8 and the POI shift from 39.6 to 39.8 was .143, not as good as .121 between first two charges, but looking at velocity, group size, and POI shift it seems 39.7 might be the ideal load. Now back to the free bore problem, I'm already at max OAL for the magazine so trying to fine tune with seating depth seems a bit limited, and am I really going to be able to squeeze out an inch with seating depth? I searched the history and found this thread below and see where many say this excessive free bore isnt necessarily a problem. So what are your thoughts? [URL]https://www.longrangehunting.com/threads/anyone-deal-w-700-rem-w-long-throat-new-gun-not-shot-out-rem-do-this-on-purpose.120193/page-2[/URL] [/QUOTE]
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Is too much free bore my problem?
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