Thread: Just the tip......7 rem mag A-Tip load development

Well charge ladder shot this morning, didn't leave me feeling too confident nothing grouped better than about 1 inch except the hottest load but that was well over pressure and i wasn't gonna be anywhere near that.

1.) 72gn avg: 3020fps S.D: 22fps E.S: 44fps group size approx 1.5"

2.) 73gn avg: 3088fps S.D: 10.4fps E.S: 20.8fps group size approx 1.8"

3.) 74gn avg: 3126fps S.D: 11.5fps E.S: 23fps group size approx 1.5"

4.) 75gn avg 3188fps S.D: 19fps E.S: 38fps group size .7" but way too hot erratic velocity and heavy bolt (book max load velocity is 3047fps so well over pressure here)

I was happy enough to shoot the 3 higher loads having seen nothing concerning in brass, primers etc but fully aware they were all considered over pressure.



I went home feeling a little disappointed but set about loading a seating depth ladder using my lowest charge, i used the lowest as i knew by seating the projectile deeper into the case there was potential for pressure to increase.
I seated projectiles at 30thou jump, 50thou jump and 90thou jump.

Back to the range.

30thou load produced just over 2" group avg velocity 3043fps S.D: 19fps E.S: 38fps

50thou load produced .54" group avg velocity 3018fps S.D: 8.5fps E.S 17fps (that'll do)

90thou load produced 1" group avg velocity 3017fps SD: 16.7fps E.S 34fps

I have no doubt i could tutu and tweak this but i see no need to and don't have the time.
I loaded up 6 more and confirmed grouping without the magnetospeed, very slight shift in P.O.I but grouping stayed around .5-.6"
Happy days, I will definitely be upgrading the trigger as i really struggled even with the Bergara trigger set to it's lightest setting which I'm picking is between 2.5 and 3lbs (I like em really light).




(the green tip projectiles are factory Sako 140gn blade, i picked those up for up close things)