QL question

[barthowes]

After reviewing QL data given to me and looking back at an earlier post I noticed something odd and alarming. The SAAMI pressure rating for the 30-06 is 60K.. The post had this at 65K while my data is for 60K. Why would someone do this?? I would think changing the MAX PSI would give you false sense of safety.. I am NEW, still very, very GREEN... Please explain... :? If you were to go above published loads wouldn't you just do it slowly and watch for any pressure signs?????

 

[DrMike]

barthowes,

I can't respond definitively as I don't know which data you are referring to. I did check your posts, however, assuming you were referring to a post that you had generated. I noted that POP had provided QL data for the 30-06 with RL17 and Barnes 168 TSX. Reading that data, all charges generating more than 60K psi are clearly identified with the notation: DANGEROUS LOAD-DO NOT USE! QL generates data in graduated steps (1.754% in this instance), clearly marking all loads that generate excessive pressures as DANGEROUS.

You will also note the following note provided: CAUTION: Figures exceed maximum and minimum recommended loads !

It is really not wise to deliberately exceed data that projects higher pressures than SAAMI standards. This is the reason you are urged to work up your loads carefully, watching for signs of excessive pressure.

 

[barthowes]

I had a guy run quickload for RL17 in my 06 for the 168 grain Nosler BT and 200 grain AccuBond. My OAL on both rounds was 3.41" and my brass capacity was 68.5 grains. I am using a savage 116 rifle so I set my max pressure at 65,000psi. The max charge estimated at 65,000 psi for the 168 grain BT was 59 Grains and the actual measured velocity was 3012FPS. The 200 grain AccuBond was 54 grains at 2720 fps. In both cases quickload estimated the velocity within 20-30 fps so the program seemed very accurate in my case. This powder was a full 100 fps faster than what I got with any other powder.

My best groups are less than 3/8" with the 180 grain AccuBond at 56 grains at 2820 FPS.

here is the thread I'm refering to

 

[DrMike]

barthowes,

Data that is not pressure tested must always be treated as suspect. 3006savage did say that he set his max pressure at 65K psi. QL does permit setting the pressure wherever one wishes; some people opt to set the pressure to this level on the basis that the 270 Winchester, built on the 30-06 case, boasts an SAAMI pressure limit of 65K psi. Increasing the pressure from 60Kpsi to 65Kpsi permits (with 165 grain AB and RL17) a projected increase in velocity of ~73 fps in a 22 inch barrel, which though negligible is nevertheless measurable. I advise those who are new to the field, or who feel uncomfortable, to stay with pressure-tested data. The hand loader must always be aware that he/she is responsible to approach every charge that will generate higher pressures with caution.

 

[barthowes]

thank you very much for explaining why the pressures were different...
Being green and only owning 30-06's (three) I never knew the 270 had different pressure max.. Who da figured that :? If I go above the max load of RL 17, I will go very slow and cautious..Don't know if I will?! this is my deer load. Going for accuracy first velocity second.. :grin:

 

[DrMike]

Honestly, the velocity differential in this instance is so minimal that I really don't see a significant upside in increasing your charge. No game animal will notice a difference of 73 fps.