JARACAL

Good day gents

If possible I would like someone to tell me what "node" I should be aiming at.
Info is as follows:

Howa 30.06 22 inch
CCI 200 primers
S365
Cases are PMP
H20 capacity 68.3gr
Hornady interlock 165gr
and Hornady interbond 150gr
TPL is 82.2mm
Jump to lands is 1 mm
Please let me know what I should be loading at for both weights to reach best accuracy.

Thanks
Daneel

Hi Daneel

To assist you a little bit more info is needed
Did you shoot previously with these combinations

If you did, did you use a crony to measure speed, and at what loads

No two guns will be exactly the same, and the speed is needed to calibrate QL for your fire arm

What lot of 365 are you using.
Are you going to use the same tpl for both

If you read through this thread you will also see the guidelines in more detail and the why's

http://www.jaracal.com/viewtopic.php?f=132&t=12312

Hi Johan

I have read the guidelines, but to date I have not put them through a chrony, Don't own one yet.
The powder I have are from 2 lots ie lot 066 and lot 071
I hope this helps

Thanks
Daneel

Daneel

Without the actual speed it is going to be difficult to calculate optimal QL calculations

Do you perhaps have access to a chrony, if not I would suggest that you use the somchem website http://www.somchemreload.com and see their recommendations

Even with the different lot nr you are going to get different results

For the 150 I would suggest to start @ 54,5gr whitch is roughly in the middle of their load recommendations. Load 3 more and increase your load with 0.5 to 55gr and another 3 up to 55,5gr. Maybe you are lucky and get a decent grouping

For the 165 I would suggest to start @ 53,5gr whitch is roughly in the middle of their load recommendations. Load 3 more and increase your load with 0.5 to 54 and another 3 up to 54,5gr. Maybe you are lucky and get a decent grouping

Please just be on the lookout for any pressure indicators with every load.

I Have just checked, and see that Lot 71 is 1,2% above, and 66 is 1% under their benchmark.

This will have an effect that you will need less power of 71 to get the same speed than what you would get with 66.

I've also heard Lot 71 is hot! Be careful! The actual weight in grains that Somchem gives is only an indication. It is the data obtained in their specific test rifle. Rather start lower and work up.

Since muzzle velocity is related to the chamber pressure, it is the only parameter that would give you an indication of the actual pressures with a high level of confidence. Once you reach the maximum muzzle velocity published in the Somchem test data, you know you're at max. Minus roughly 25fps per one inch shorter barrel. So 22" = 2930fps

Best advice? Cough up R1400 and buy a Chronograph or borrow one from a friend. Everytime you buy a new can of propellant from a different lot, you're xy.z-gr S365 that worked so well at abc-fps a few months back now produces poor accuracy and you struggle to explain the logic behind it. Then the rifle gets blamed and gets free floated, bedded, new trigger, scope and a silencer in the hopes of achieving that magical groups again. All this for nothing.

Point is, xy.z-gr S365 was never your reference point. abc-fps was, and you need to work up or down to match that velocity.

Without a chrony, you'll need to do fine tuning time and again for each lot.

Once you've put a few rounds through the chrony, we can calibrate quickload to your specific system of components, and use it to fast-track the load development process based on the optimum barrel time theory.

Hope this helps

I would take the 2 lots of powder and mix them and then use them. This will avoid adjusting after Lot 66 is finished. Put both cans into a sealable container and rotate in all directions till you have a thorough mix. Now you have one variant you have to contend with.