Wondering about a new 308 vs 30-06 angle - Page 2

Bart B. · March 12, 2013, 07:25 PM

jmr40 says his 30-06 handloads in 150, 165, and 180 gr loadings are beating those numbers by 100-150 fps. He's loading about .5-1 grain below a max load that shows around 58,000-59,000 psi.

And you used a SAAMI spec mounted barrel with a pressure transducer installed to SAAMI specs to verify the pressure numbers and a chronograph to verify the velocity. Right?

jmr40 · March 12, 2013, 09:11 PM

I'm using a chronograph and loads under max listed in multiple sources. 60 gr of H-4350 chrono's around 3015-3025 fps with 150's from my rifle. Book max is 62 gr with an expected velocity of 3068 fps with a max load. 60 gr of Ramshot Hunter is pushing 150 TSX bullets to right at 3000 fps. Max load is 60.7 gr with an expected velocity of 3038 fps.

I'm getting 2890-2900 with 165's and 58.5 gr of H-4350. Max load is 59 gr with an expected velocity of 2934 fps

57 gr of H4350 is giving me 2780 fps with 180's. Max load is 57.5 with an expected velocity of 2798 fps.

All of these loads have proven to be perfectly safe in my rifles with no overpressure signs. I have worked right up to the max loads, but found the best accuracy where I am. Well under 1 MOA.

Cheap 870 · March 13, 2013, 06:36 AM

If one makes a comparison between these two using SAAMI spec bullets, barrels, velocity and pressure, it might be more realistic.

.30-06, 24" barrel, max average pressure 60,000 psi:
110-gr. bullet, 3300 fps
125-gr. bullet, 3125 fps
150-gr. bullet, 2900 fps
165-gr. bullet, 2790 fps
180-gr. bullet, 2690 fps
200-gr. bullet, 2540 fps

.308 Win, 24: barrel, max average pressure 62,000 psi:
110-gr. bullet, 3150 fps
125-gr. bullet, 3030 fps
150-gr. bullet, 2800 fps
165-gr. bullet, 2670 fps
180-gr. bullet, 2600 fps
200-gr. bullet, 2440 fps

These are factory standards, correct?
If you handload both calibers can easily be tweaked to gain another 100 to 150 fps.

Bart B. · March 13, 2013, 06:48 AM

Cheap 870, those are SAAMI standards established under controlled conditions. It's voluntary for ammo factorys to make loads that match them.

I agree you can load ammo to shoot bullets faster than SAAMI specs. Are those loads at the same peak pressure as SAAMI used? If not, then you aren't "leveling the playing field." Anyone can get more velocity by raising pressure as well as using a longer barrel or smaller bore and groove diameters. But when comparing system A to system B, changing more than one thing at a time masks what only one thing will change.

March 12, 2013, 07:25 PM	#26
Bart B. Senior Member Join Date: February 15, 2009 Posts: 8,927	jmr40 says his 30-06 handloads in 150, 165, and 180 gr loadings are beating those numbers by 100-150 fps. He's loading about .5-1 grain below a max load that shows around 58,000-59,000 psi. And you used a SAAMI spec mounted barrel with a pressure transducer installed to SAAMI specs to verify the pressure numbers and a chronograph to verify the velocity. Right?

March 12, 2013, 09:11 PM	#27
jmr40 Senior Member Join Date: June 15, 2008 Location: Georgia Posts: 10,809	I'm using a chronograph and loads under max listed in multiple sources. 60 gr of H-4350 chrono's around 3015-3025 fps with 150's from my rifle. Book max is 62 gr with an expected velocity of 3068 fps with a max load. 60 gr of Ramshot Hunter is pushing 150 TSX bullets to right at 3000 fps. Max load is 60.7 gr with an expected velocity of 3038 fps. I'm getting 2890-2900 with 165's and 58.5 gr of H-4350. Max load is 59 gr with an expected velocity of 2934 fps 57 gr of H4350 is giving me 2780 fps with 180's. Max load is 57.5 with an expected velocity of 2798 fps. All of these loads have proven to be perfectly safe in my rifles with no overpressure signs. I have worked right up to the max loads, but found the best accuracy where I am. Well under 1 MOA.

March 13, 2013, 06:36 AM	#28
Cheap 870 Junior member Join Date: November 12, 2011 Location: Ohio Posts: 159	If one makes a comparison between these two using SAAMI spec bullets, barrels, velocity and pressure, it might be more realistic. .30-06, 24" barrel, max average pressure 60,000 psi: 110-gr. bullet, 3300 fps 125-gr. bullet, 3125 fps 150-gr. bullet, 2900 fps 165-gr. bullet, 2790 fps 180-gr. bullet, 2690 fps 200-gr. bullet, 2540 fps .308 Win, 24: barrel, max average pressure 62,000 psi: 110-gr. bullet, 3150 fps 125-gr. bullet, 3030 fps 150-gr. bullet, 2800 fps 165-gr. bullet, 2670 fps 180-gr. bullet, 2600 fps 200-gr. bullet, 2440 fps These are factory standards, correct? If you handload both calibers can easily be tweaked to gain another 100 to 150 fps.

March 13, 2013, 06:48 AM	#29
Bart B. Senior Member Join Date: February 15, 2009 Posts: 8,927	Cheap 870, those are SAAMI standards established under controlled conditions. It's voluntary for ammo factorys to make loads that match them. I agree you can load ammo to shoot bullets faster than SAAMI specs. Are those loads at the same peak pressure as SAAMI used? If not, then you aren't "leveling the playing field." Anyone can get more velocity by raising pressure as well as using a longer barrel or smaller bore and groove diameters. But when comparing system A to system B, changing more than one thing at a time masks what only one thing will change.