Help with testing results

[Pwoller]

[Pwoller]

[LRRPF52]

[grayfox]

My first quick-analysis suggests your 29.6 load for 8208- ~2450 Ft/s.
I will do some more work after turkey-day.

My 12.5" Grendel barrel also had a node at the 2450 ft/s MV, as well, for 100 gr Eldm - which is a cup/core so not unexpected to see this for the mono-metal 95 Trex.

[Pwoller]

[StoneHendge]

Try shutting off your gas and running it manually. If your still getting ejector marks, your problem is pressure. If they go away, it's at least partially a problem of dwell time (gas system timing). New brass *should* be at minimum spec, so you will likely get a tad more pressure than after it's 1x. Both because it may widen a little (depending on your die) and because it will be longer and formed to your headspace (even after you bump it down).

[Yondering]

[Klem]

Pw,

Your initial case stretch of .011" is fine.

SAAMI permits up to .017" of stretch for this calibre. My initial stretch for new Lapua cases in a Lilja barrel/chamber is .016". That's a long first stretch but from then on you bump back only .003" and all is well.

[Pwoller]

[Pwoller]

Pw,

Your initial case stretch of .011" is fine.

SAAMI permits up to .017" of stretch for this calibre. My initial stretch for new Lapua cases in a Lilja barrel/chamber is .016". That's a long first stretch but from then on you bump back only .003" and all is well.

Thanks for the reassurance.

[Pwoller]

Try shutting off your gas and running it manually. If your still getting ejector marks, your problem is pressure. If they go away, it's at least partially a problem of dwell time (gas system timing). New brass *should* be at minimum spec, so you will likely get a tad more pressure than after it's 1x. Both because it may widen a little (depending on your die) and because it will be longer and formed to your headspace (even after you bump it down).

Tested it like you suggested after adjusting the gas, getting the bur off the bolt face, adding the heavier buffer and correcting the shoulder. No swipes. Then I put the suppressor back on and tuned the gas and still no swipes.

[StoneHendge]

Tested it like you suggested after adjusting the gas, getting the bur off the bolt face, adding the heavier buffer and correcting the shoulder. No swipes. Then I put the suppressor back on and tuned the gas and still no swipes.

{Thumbs up emoji}

[Yondering]

[Pwoller]

I settled on 28.4 of h322 after a lot of testing. Did some seating depth groups and found a good depth. Thanks for all the help guys. 1 inch groups at 100 yards is good for my purposes. Now on to the 85 grain trex.