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308 seating depth

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/26/2013 at 19:10
fatboy15th View Drop Down
Optics GrassHopper
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Joined: January/20/2013
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i have a 308 and just measured my seating depth by putting sierra 175 mk in a spent case and chambering it, came up with an average of 2.864". then measured a few fed prem gmm 175 sierra mks at an average of 2.817 c.o.a.l. i think that means when i chamber one of those factory rounds i am off the lands by .047" if im figuring right , does that seem to be a long jump or or not, am i doin sumpin wrong? as u may have already surmized i am new to all this.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/26/2013 at 19:19
ccoker View Drop Down
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What type of gun is it?
A lot of factory barrels have long throats..
My rem LTR does but I just load at 2.80 and play with powder.
I have owned several 308s and have been able to get all to shoot extremely well that way.
43.5 to 44.5g of Varget has done the trick in all with 175s.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/26/2013 at 20:36
fatboy15th View Drop Down
Optics GrassHopper
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its a tikka t3. thanks i will try the same
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/26/2013 at 22:39
ccoker View Drop Down
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I have had a t3 stainless lite and 45.2g with 165 SGK was one hole groups
My buddy had the Varmint model, same thing

With the Tikkas really being a long action you are constricted by mag length as well.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/31/2013 at 12:20
stickbow46 View Drop Down
Optics Master Extraordinaire
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My Remmy SS 5R milspec measures 2.094 in the throat I load @ 2.085 using 168 grainers with 43.5 grns Varget & have no problems.Funny part of this is that my Fed Gold Match factory[2.07] shoots just as accurate as my hand loads,go figure.............
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/31/2013 at 23:00
jonoMT View Drop Down
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Only secant ogive bullets really have given me a need to ever tinker with seating depth. And as mentioned, with a factory throat being pretty long, that's often something you just can't do well or safely. Most any tangent or hybrid ogive bullet will be just fine @ 2.8 OAL in a .308. Just vary the load. Look up "ladder test". I will typically run mine in .4 gr. increments because I can run any 2-grain span with 6 loads, e.g. 43, 43.4, 43.8, 44.2, 44.6, 45 for Varget...looking for pressure signs of course.
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