I think you are wise testing first at 100 then farther out with the 100 yd established load.
Berger 108 target bt seating depth?
- Thread starter Falfan2017
- Start date
Stick with what YOUR RIFLE LIKES ! The BERGER 6mm 108 BT Target bullet has a TANGENT ogive and over length nose dimension. The nose dimension gives it the BC numbers. The TANGENT ogive makes it tolerant of jump. You have to test and find what YOUR RIFLE likes to be at its most accurate. And gives you the velocity you need for the round to still be supersonic at the range(s) you will be shooting out too. Also look at the Standard Deviation (SD) reading (10 or less) and "water line" of the bullet strikes on the target . This will indicate whether or not your load / bullet seating depth has very little or no Vertical Dispersion which is what you want.
Ok, since this thread is still active, I'll add my experience too.
I'm shooting a Savage 12 F Class in 6br and initially the throat was too short to seat the 105 Hybrids out far enough to keep the bearing surface out of the shoulder area. So, I had a local "gunsmith" extend the throat.
Things went array along the way and then it was impossible to get enough bearing surface and keep the .030 jump that the rifle liked. So, I decided to try the 108 instead, knowing that I would need a big jump.
It turns out that .120 jump gives me about .180 seated bearing surface and It groups very well! I'm very happy with the combination and my shooting/scores keep getting better.
Richard
I'm shooting a Savage 12 F Class in 6br and initially the throat was too short to seat the 105 Hybrids out far enough to keep the bearing surface out of the shoulder area. So, I had a local "gunsmith" extend the throat.
Things went array along the way and then it was impossible to get enough bearing surface and keep the .030 jump that the rifle liked. So, I decided to try the 108 instead, knowing that I would need a big jump.
It turns out that .120 jump gives me about .180 seated bearing surface and It groups very well! I'm very happy with the combination and my shooting/scores keep getting better.
Richard
Yes and no.
Fine to DEVELOP a load at 100 yards. Best to FINE TUNE WAYYYYY out there. It is just easier to see the difference at longer range.
I know that there have been a few threads here about "load development at 100 yards". But....I ALWAYS had my own private 1200 yard range, and was always fairly successful in 1K br. THIS YEAR I was restricted to 750 and never did ANY tuning at 1K. I didn't have the greatest of years!! Was it the lack of testing at 1K...OR...I'm getting old?
Who knows.
As far as the OP...I have ALWAYS had better "luck"
with a 10 to 20 thou JAM with EVERY bullet in EVERY BBL. I shoot the 108's, 105 H, and 105 VLD....all INTO the lands.Good luck,
Tod
Of all the bullets I've tried, this one is the most tolerant of seating depth, just need to be mindful when jamming because the longer bearing surface of this bullet will impact the pressure if you're not careful. I did get caught out with this but quickly worked out what was going on. 10 into the lands and 10 out - I've shot clean with this bullet out to 800 metres. Whether it's even happier with a larger jump I have no idea, it was just very easy to get shooting well.
Man, your reading and comprehension skills suck.
What does "load development at close range" mean?
What does "fine tune" mean?
What would "fine tune at longer range" mean?
I do seating depth tests on everything. How else would I know that the jam shoots best?
NEVER did I say Jam em and shoot em.
People say run a seating depth test from 20 in to 20 out in 2 thousands intervals. That's a lot of ammo and barrel life. You think 3 shots gives you enough info or really need 5-10 to prove your group ?
I probably shouldn't have criticized I just struggled to read your post,
Have you proof read it yourself?
You jump around a bit, there is a few grammar issues several smileys etc.
you seem to talk more of your private range and your own accomplishments and what YOU always do than really advise on load development techniques.
When I see those types of post I admit to cherry picking.
SPJ
"you seem to talk more of your private range and your own accomplishments and what YOU always do than really advise on load development techniques."
He asked "what seating depth works best for you"?. I answered. He didn't ask about load development techniques. Pretty simple reading.
Would you prefer to hear from people who don't have any accomplishments? How about hearing from people who don't have any first hand knowledge..who only quote what the read on the I N T E R N E T? How about from people who just want to argue?
There are a few people around here just like that. They don't last long, and are called out on it. People want to hear from experienced shooters who have been there and done that. I got the t-shirt!! If you think that this is bragging, then so be it.
My thoughts are that people ask questions from people more knowledgeable...and..there is ALWAYS someone with more knowledge and experience on this form!!
If not, then why are we all here?
Tod
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We are getting off topic here
No matter what the test, or what you are testing for.....if you shoot 3 shot groups, and some of the groups are bad, adding shots to those groups won't make them better. True one good 3 shot group needs to be looked at more with more groups, but, at least you know which loads to NOT try again.
Actually, with my big 300's and 338's I shoot 2 shot groups to start to save on ...well, everything, including my shoulder.
Just my .02,
Tod
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Yeah I've settled on 3 shot groups for my 284 and 3 or 4 shots for a 6br. For whatever reason my flier tends to be in the first 3 shots. My 5th round never seems to destroy my groups.
Imo you start with larger movements over a wide range...say .005. This should highlight a window that shows whether it likes jam jump or a lot of jump. In smaller increments say .003 tune in around that window.
This bullet doesnt look fussy. So it might not give a strong preference of any one depth. I always go past the best so I know. Typically it's a pattern that starts larger tightens up and then increases again.
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