velocity drops with powder increase

Shadow9mm · May 26, 2020, 06:32 PM

trying to figure out if I messed up some how. tested a batch of loads today and had velocity decreases with increased charge weights before going up again. 30-06, varget, remington 9 1/2 primers speer 150g gold dots loaded to 0.011 off the lands. Had primers starting to flatten with the last 2, rest looked normal. fired 5 round groups.

RaySendero · May 26, 2020, 08:02 PM

Well...The only load data I got for Varget in a 30-06 with a 150gr jacketed bullet shows:

51.0 Grains as max with a tested pressure of 50,100 CUP
at an average velocity of 2,975 fps from a 24" test barrel.

Shadow9mm · May 26, 2020, 08:08 PM

Quote:

Originally Posted by RaySendero

Well...The only load data I got for Varget in a 30-06 with a 150gr jacketed bullet shows:

51.0 Grains as max with a tested pressure of 50,100 CUP
at an average velocity of 2,975 fps from a 24" test barrel.

hornady lists all bullet weights and types together. 150-155g. they list 53.6g as max at between 2900-2949fps. they don't list pressure

RaySendero · May 26, 2020, 08:26 PM

50,100 CUP should be about 58,000 PSI.

hounddawg · May 26, 2020, 08:29 PM

Might be a sign you are at the top of the load. Nice wide node down at 51.5 and 52.0 to play with if you don't mind losing a few FPS. What are the SD's and ES's

long range, short range, target or hunting round

big al hunter · May 26, 2020, 08:42 PM

How many rounds were fired at each charge weight?

Shadow9mm · May 26, 2020, 08:43 PM

Quote:

Originally Posted by hounddawg

Might be a sign you are at the top of the load. Nice wide node down at 51.5 and 52.0 to play with if you don't mind losing a few FPS. What are the SD's and ES's

long range, short range, target or hunting round

was hoping to get a littler higher up. think i am going to re-test next time i go out. 5rnd groups
51.5 sd 13, es 28
52.0 sd 8 , es 19
52.5 sd 20, es 58
52.0 sd 18, es 47
53.5 sd 13, es 31

dahermit · May 26, 2020, 08:45 PM

deleted

Shadow9mm · May 26, 2020, 08:46 PM

I always do 5 rounds for the initial work up.

hounddawg · May 26, 2020, 09:01 PM

As a target guy I would definitely explore that 51.5 - 52.0 range. For hunting you still have over 800 ft lbs of energy at 600 yards, the higher node would stretch the kill range out to 700

Bart B. · May 26, 2020, 09:19 PM

Shoot at least 5 shots per charge weight. You're gonna get ten times more meaningful data.

Nobody shoots 1 shot groups to measure accuracy.

Shadow9mm · May 26, 2020, 09:20 PM

Quote:

Originally Posted by hounddawg

As a target guy I would definitely explore that 51.5 - 52.0 range. For hunting you still have over 800 ft lbs of energy at 600 yards, the higher node would stretch the kill range out to 700

its actually a bit better than that. the Gold dot has a fantastic .503 G1 BC, in the 51.5 to 52.0 at 2916 muzzle it should retain 816ft lb at 850yds. , the higher 53.0-53.5 would only gain me 50yds, stretching it to 900yds. I will definitely explore 51.5-52.0

May 26, 2020, 08:02 PM	#2
RaySendero Senior Member Join Date: August 23, 2010 Location: US South Posts: 857	Well...The only load data I got for Varget in a 30-06 with a 150gr jacketed bullet shows: 51.0 Grains as max with a tested pressure of 50,100 CUP at an average velocity of 2,975 fps from a 24" test barrel. __________________ *Ray*

May 26, 2020, 08:26 PM	#4
RaySendero Senior Member Join Date: August 23, 2010 Location: US South Posts: 857	50,100 CUP should be about 58,000 PSI. __________________ *Ray*

May 26, 2020, 08:29 PM	#5
hounddawg Senior Member Join Date: March 1, 2009 Posts: 4,232	Might be a sign you are at the top of the load. Nice wide node down at 51.5 and 52.0 to play with if you don't mind losing a few FPS. What are the SD's and ES's long range, short range, target or hunting round __________________ “How do I get to the next level?” Well, you get to the next level by being the first one on the range and the last one to leave.” – Jerry Miculek Last edited by hounddawg; May 26, 2020 at 08:35 PM.

May 26, 2020, 08:42 PM	#6
big al hunter Senior Member Join Date: March 12, 2011 Location: Washington state Posts: 1,558	How many rounds were fired at each charge weight? __________________ You can't fix stupid....however ignorance can be cured through education!

May 26, 2020, 09:01 PM	#10
hounddawg Senior Member Join Date: March 1, 2009 Posts: 4,232	As a target guy I would definitely explore that 51.5 - 52.0 range. For hunting you still have over 800 ft lbs of energy at 600 yards, the higher node would stretch the kill range out to 700 __________________ “How do I get to the next level?” Well, you get to the next level by being the first one on the range and the last one to leave.” – Jerry Miculek

May 26, 2020, 08:45 PM	#8
dahermit Senior Member Join Date: October 28, 2006 Location: South Central Michigan...near Posts: 6,501	deleted

May 26, 2020, 08:46 PM	#9
Shadow9mm Senior Member Join Date: March 21, 2012 Location: Indianapolis, IN Posts: 3,969	I always do 5 rounds for the initial work up.

May 26, 2020, 09:19 PM	#11
Bart B. Senior Member Join Date: February 15, 2009 Posts: 8,927	Shoot at least 5 shots per charge weight. You're gonna get ten times more meaningful data. Nobody shoots 1 shot groups to measure accuracy.