Seating Depths/Accuracy - Deer Hunting Forums
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post #1 of 11 (permalink) Old 05-04-2009, 09:46 AM Thread Starter
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Seating Depths/Accuracy

Anyone tinker around with various seating depths in regards to accuracy results? In working up optimum accurate loads it is imperitive to understand how far off the lands your bullet sits. Every rifle has different freebore so finding the right OAL is fun stuff. I have yet to do this with my 25-06 but look forward to creating this marriage between bullet/rifle.

The correct seating depth is the single fastest way to getting better groups followed by good brass prep and accurate/safe powder charges. I have lots more to learn about reloading and doing alot of research right now. I am currently working with a bench shooter who gets .25" groups from a starting point of 1.25" @ 100 yards with a 7mm mag. It's amazing at all the attention to detail needed to yield results.

I plan on reloading more for recreational and economic reasons than competition shooting. I will do all the fun work to find the right loads using various powders, bullets, OAL, etc. If I can consistently shoot under MOA then I am satisfied. You hit a point where you find the right load and now it's your shooting skills that make the diff. All guns are capable of shooting more accuratly than the shooter assuming the rifling is not shot out or the bore is neglected.

I welcome any reloading advise that anyone has to offer.
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post #2 of 11 (permalink) Old 05-04-2009, 03:25 PM
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post #3 of 11 (permalink) Old 05-06-2009, 11:38 AM Thread Starter
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I plan on starting .050 off the lands and creep in .010 increments using 5 shot sets through a chrony. My best groups may very well be sitting on the lands if my magazine allows it. With a breakopen action you don't have this restriction and can really find the sweet spot.
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post #4 of 11 (permalink) Old 09-07-2009, 05:50 PM
DKA
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Almost all rifles are different, got a 22 250 that shoots best with length taken from reloading manual, which is .250 off of the lands on this rifle.

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post #5 of 11 (permalink) Old 10-14-2009, 12:18 PM
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go spend 35 bucks on a hornady case/cartridge over all length guage and a peice of brass to go with it. Also if you are measuring cartridge oal with exposed lead tip bullets there is varations in thebullet, so you may want to get hornadys bullet comparitor also, just a word of advise i have found theses two tools to be almost as valuable as a good set of dies!
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post #6 of 11 (permalink) Old 10-18-2009, 07:32 PM
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Originally Posted by northeastmohuntershooter View Post
go spend 35 bucks on a hornady case/cartridge over all length guage and a peice of brass to go with it. Also if you are measuring cartridge oal with exposed lead tip bullets there is varations in thebullet, so you may want to get hornadys bullet comparitor also, just a word of advise i have found theses two tools to be almost as valuable as a good set of dies!
right its not necessarily to the tip but the start of the touching of the lands. bullet shapes are different so that length changes with different bullet manufactures.
post #7 of 11 (permalink) Old 01-18-2010, 06:23 PM
DKA
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Sound advice, OAL Gauge and Comparitor

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post #8 of 11 (permalink) Old 01-19-2010, 07:41 PM Thread Starter
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Measuring by oal can be inconsistent due to various bullet shapes and tips. The most consistent method is understanding where the ogive meets the lands and backoff from there.

I take a dremel and cut the case 2/3 down the shoulder and slip in a bullet and take repeated measurements. Then I seat the bullet .030 deeper for starters. If the accuracy is not there I will try .020 & .010 longer. I rarely shoot of the lands and find I get acceptable accuracy in these ranges.

I just bought a TC Prohunter-7mm-08 so my reloading will be based off the headspacing of .001 from the wall with my bullet ogive sitting on the lands.
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post #9 of 11 (permalink) Old 01-19-2010, 07:44 PM
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post #10 of 11 (permalink) Old 02-13-2010, 04:51 PM
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seating depth

I started jst off lands with sst n scorocco great accuracy gd velosity now seatng 2 fit in magazines of 4 270 rifles savage still shoots 10 mm groups 3145 fps no presure it dose make difrence in some rifles but savage dosnt seem 2 mind
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