Hey bud..your doing this test wrong by shooting 5 of each loading and them moving left to right for each powder charge weight.
throw away your results and rerun this test as follows:
shoot 1 shot of each powder weight at its corresponding dot, move left to right, give 5 mins between each shot. (check for signs of pressure each shot)
if have 3 rounds of ammo for each load run through this, one shot per dot left to right 3 times. the reason for this method is to
spread any heat build up evenly across all powder loads, vs having the last 2 or 3 highest charge weights see the most heat and hot barrel shift. this method is even more important on a thinner hunting profile barrel, .the way you did the test, if theres plenty of cool down time between shots is ok on a heavy barrel, but even then can have shifts of 1/2 to 1 inch at 100 yards, and this takes alot longer to do, all that cool down time between shots,. excited to see the new results, happy shooting!!!
at sub 2500 fps, a 1:11 twist WONT stabilise that bullet too well. If you have a 1:10 twist 26 inch barrel, you would JUST get away with a 2400 fps load.
The Good Lookers
You’ve likely noticed this, but your 39.5 loading wouldve been tighter, though stringing horizontally, if not for the wind blowing the target forward.
Trumpie
Crooked bullet entry is wrong twist in barrel
Squib308
Your channel is a tremendous resource. Thank you.
RDUBFAL
Hey bud..your doing this test wrong by shooting 5 of each loading and them moving left to right for each powder charge weight.
throw away your results and rerun this test as follows:
shoot 1 shot of each powder weight at its corresponding dot, move left to right, give 5 mins between each shot. (check for signs of pressure each shot)
if have 3 rounds of ammo for each load run through this, one shot per dot left to right 3 times. the reason for this method is to
spread any heat build up evenly across all powder loads, vs having the last 2 or 3 highest charge weights see the most heat and hot barrel shift. this method is even more important on a thinner hunting profile barrel, .the way you did the test, if theres plenty of cool down time between shots is ok on a heavy barrel, but even then can have shifts of 1/2 to 1 inch at 100 yards, and this takes alot longer to do, all that cool down time between shots,. excited to see the new results, happy shooting!!!
Ryan
TRG
For 208 gr My sako 308 W
I use RL 17 Fed 210 primer a neck expander mandrel E.306
krycer krycer
at sub 2500 fps, a 1:11 twist WONT stabilise that bullet too well. If you have a 1:10 twist 26 inch barrel, you would JUST get away with a 2400 fps load.