Ran some load tests today which I thought I would share. Obviously I worked up slowly and safely to these loads checking carefully for pressure signs on each shot. I felt for heavy bolt lift and inspected each piece of brass. No pressure signs detected. My aim today was to push the 170g B476s a bit harder as I want to use them at longer ranges than I have done previously. The results were pleasing. 3 shot groups down to .358MOA.
I had some issues with shadow after string 3 and rectified this in string 5 as you will see below.
Load Testing 23/7/14 .308 Win
Rifle: Remington 700 SPS action and barrel, 26" 1-12 twist, Manners T5 stock, Badger Ordanance pillar bedded mini chassis, Recrowned by SYSS.
Scope: Vortex Viper PST FFP 6-24.
Weather: 77F, 2.978Hg@115ft Sunny. Light 2-5mph wind from 4 'O clock.
Ammunition: Lapua .308 Brass, once fired and neck sized to Reddings 335 bushing. Deburred, chamfered, pockets cleaned. Lapua 170g LB B476 bullets seated at 2.833" TR140 powder, CCI LR primers.
Crono set up 10ft from muzzle.
44.8g: 2604, 2583, 2576
44.9g: 2709, 2731, 2732
45g: 2783, error, error
45.2g: 2809, 2756, 2740
45.4g: error, error, 2624
Chrono repositioned as shadow cast by the roof began to cut across the sensors and cause errors.
Chrono set up 5ft from muzzle.
45.5g: 2688, 2704, 2699
45.6g: 2715, 2699, 2732
45.7g: 2724, 2787, 2745
45.8g: 2726, 2721, 2743
45.9g: 2766, 2760, 2726
46g: 2741, 2754, 2760
46.1g: 2777, 2731, 2751
46.2g: 2772, 2754, 2777
46.3g: 2754, 2755, 2754
46.4g: 2799, 2754, 2766
No pressure signs at all.
Load Data with Remington 700 .308, TR140 and Lapua B476s..
Moderator: dromia
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All handloading data posted on Full-Bore UK from 23/2/2021 must reference the published pressure tested data it was sourced from, posts without such verification will be removed.
Any existing data without such a reference should be treated as suspect and not used.
Use reloading information posted here at your own risk. This forum (http://www.full-bore.co.uk) is not responsible for any property damage or personal injury as a consequence of using reloading data posted here, the information is individual members findings and observations only. Always verify the load data and be absolutely sure your firearm can handle the load, especially older ones. If in doubt start low and work your way up.
All handloading data posted on Full-Bore UK from 23/2/2021 must reference the published pressure tested data it was sourced from, posts without such verification will be removed.
Any existing data without such a reference should be treated as suspect and not used.
Use reloading information posted here at your own risk. This forum (http://www.full-bore.co.uk) is not responsible for any property damage or personal injury as a consequence of using reloading data posted here, the information is individual members findings and observations only. Always verify the load data and be absolutely sure your firearm can handle the load, especially older ones. If in doubt start low and work your way up.
Re: Load Data with Remington 700 .308, TR140 and Lapua B476s
What was the group with 46.3 grains like?
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paulbradley
Re: Load Data with Remington 700 .308, TR140 and Lapua B476s
46.3 - .501MOA 2 shots in one hole with a flier just off to the right. Can't discount the wind as it began to gust during the latter strings..
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paulbradley
Re: Load Data with Remington 700 .308, TR140 and Lapua B476s
46.3 certainly warrants further investigation as the MVs seemed to level out nicely there. I should add that all reloading was done as carefully and accurately as my gear would allow. Some of the large deviations surprised me. The 28xx in the early strings I believe was in error. I need a magneto Chrono thingummybob!!
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