TTSX seating depth?

[9.3 Hunter]

.85 is sub moa........

 

[willyqbc]

I load lots of different barnes. I always start .050" off and use tht to find my powder charge. Once settled on a charge i will test incrementally deeper seating depths. Almost always end up between .050"-.070". Have seated the odd one waaay deeper than that as it was what the magazine would allow and was still able to get great accuracy by playing with charge weight.

Chris

 

[remington jim]

Barnes recommends seating 50 thousandths off the lands, just wondering if anyone has tried seating closer or further out and what were the results?

I’ve got a pretty good load developed for my .243, 80 grain ttsx’s are putting 5 rounds into .85” at 100 yards with an extreme spread of 32 FPS with the bullets seated at 50 thousandth. Should I mess with the seating depth or leave it there?

I would leave it there and play with powder chg and maybe different powders . jmo RJ

 

[coyoteking]

.85 is sub moa........

Hahaha, yeah I know. It’s just a hunting rifle but when I shot these groups at the range I got excited thinking maybe I could tighten them up a little more and give the 1/2 moa challenge a go. A $500 factory savage making the cut against all those custom rifles would be hilarious.

Otherwise I’m quite happy with the load. 43.1 grains of RL17 under a 80 TTSX, Federal match primer.

 

[Joel]

160 thou jump and it shoots sub moa? Wow I guess seating depth isn't important for accuracy! thanks for sharing

My theory on it is bore/chamber concentricty, Todbartell. The better aligned your chamber and your bore are, the less important it becomes to seat your bullet right up on the rifling and thus have some kinda self-centering effect to counteract that.

Do some dumb chit like dial indicate on the OUTSIDE of your barrel and cut a chamber you will probably need that.

If your bore and chamber are well aligned and your bullet makes a straight line dash to enter the rifling, it won't be wobbling around its axis quite so badly when it leaves the barrel and your groups be nice and tight.

There is more to it to be certain! But...

 

[Joel]

Just to add: I once saw a gunsmithing instructor have a cohort of students install their barrels into a 3 jaw chuck with about 4" of chamber end to machine on and the whole rest of the barrel sticking out the headstock with no spider, no nothing.

Tabarnack.



They cut barrel threads and their chambers with that setup.

Know how sometimes you can see on some casings that one side of the bottom near the head is a wee bit out of round? Yeah well...

Those rifles, I bet you dollars to dog nuts, LOVE a bullet jammed right down into the rifling compared to a bit of jump.

 

[Ltbull01]

I’ve always started at .05” then tune from there once I’ve identified a node. Will push it closer then back even further. I once had ‘the most accurate load’ at .11”!! Just depends on the individual rifle.