- Thread starter
- #41
105 Amax load workup - Beginner needing advice.
- Thread starter Rmitch223
- Start date
DrMike
Ballistician
- Nov 8, 2006
- 37,505
- 6,509
You would look for consistency in velocities, low standard deviations and/or extreme spreads, velocities that are consistent with those projected by loads that have been pressure tested and/or projected by good software, velocities that exceed by a significant amount what is anticipated, among other facets related to velocity.
CatskillCrawler
Handloader
- Jul 30, 2011
- 1,205
- 4
DrMike":2z0x2gqa said:
QFT.
Sometimes you see a velocity plateau which happens with some loads as you approach max pressure. Emphasis on some loads . I have also seen sudden spikes in velocity. There isn't any set criteria when trying to ascertain max pressure with a specific powder, bullet and rifle without the availability of a pressure transducer. Pressure increase is not linear which is why we look at established max charges developed in a controlled and instrumented environment. It's just a warm fuzzy to watch your velocity increases match known/published data as you increase charge weight.
Extractor swipe marks, bolt lift force, primer condition, case expansion, and velocity anamolies are all symptoms of high pressure. How high is the question we can only surmise.
- Thread starter
- #44
Brass trimming question: After this initial load testing I noticed that the cases have stretched slightly (not unexpectedly of course). They are different lengths, I assume because of the different charge weights. None of them are over the max length of 2.045". Should I trim them all to a equal length or not worry about trimming this time around because they are not passed the max length? Would I gain consistency by trimming them all to the trim to length of 2.035"?
Initial testing was done with brand new never fired Remington brass.
Initial testing was done with brand new never fired Remington brass.
- Thread starter
- #45
Ive worked up from 37gn to 40gn and the rifle is shooting very accurately with 40gn. I'm not sure I will push it anymore. I may try 40.5 and 41gn in the future but right now I'm pretty happy. Shooting 1/2" groups at 100yrds now and 1" groups at 200yrds. I'm very curious as to what velocity I'm getting with this load. Gonna have to get a chronograph asap.
DrMike
Ballistician
- Nov 8, 2006
- 37,505
- 6,509
That is certainly an accurate load, and that is far more gratifying that generating high velocity w/o the accuracy.
- Thread starter
- #47
Quickload shows that I'm at about 52,000 psi and a muzzle velocity of 2939 fps.
I think i stick with this load for awhile especially since i just purchased a Vortex Viper PST 6-24x50 and I would like to get is zeroed for this load and try this load out to 600 yards.
Ive heard a lot of people have had better results than mine with H1000 and magnum primers. May give that shot sooner or later. I'm not to sure about using a magnum primer in a cartridge that's not designed for it but I am a new hand loader so maybe that something that not too out of line, I don't know.
I think i stick with this load for awhile especially since i just purchased a Vortex Viper PST 6-24x50 and I would like to get is zeroed for this load and try this load out to 600 yards.
Ive heard a lot of people have had better results than mine with H1000 and magnum primers. May give that shot sooner or later. I'm not to sure about using a magnum primer in a cartridge that's not designed for it but I am a new hand loader so maybe that something that not too out of line, I don't know.
Oldtrader3
Ammo Smith
- Nov 6, 2009
- 8,406
- 6
Just back off 10% on your load and work up again. Magnum primers can add as much as 6,000 PSI to your load. Other than that, magnum primers may help light up the H1000 and help it burn better?
