+- (https://6mmarc.com)
+-- Forum: 6MMARC DISCUSSION (https://6mmarc.com/forumdisplay.php?fid=3)
+--- Forum: 6mmARC Ammunition and Reloading (https://6mmarc.com/forumdisplay.php?fid=6)
+--- Thread: Sierra 85hpbt and Lever (/showthread.php?tid=319)
Sierra 85hpbt and Lever - Lemonaid - 04-25-2021
Range day data mostly with Lever and the Sierra 85 bthp.
Test number 2 is I took some Factory Hornday black at 2.200 and tested five against five at 2.250 that I uses the bullet puller on to lengthen them.
Test number 3 testing 108 ELDM with Lever to see if I could find the max for my rifle.
All brass showed little signs of over pressure, a few had light ejector swipe but others with more powder did not show any signs.
Primers looked good except the CCI 400's. The Remington 7 1/2 at the higher powder charges there wasn't primer cratering but the depth of the indention from the firing pin looked like it getting deeper or the primer was stretching.
Question: What is your max loading for 105-108 bullets and Lever?
6mm ARC Monster 20 Barrel
Sierra 85 BTHP, Lever, Hornady converted brass, CCI 400 and Rem 7 1/2, 2.115
CCI 400
28.0 2562,2568,2582,2562,2576,2574,2560,2576 8=1.270 AVE 2570 SD=8.14 *2 primer pops
Rem 7 1/2
28.5 2626,2620,2632 3=1.580 AVE 2626 SD=4.9
29.0 2670,2677,2695 3= 1.240 AVE 2680 SD=12.9
29.5 2686,2789,2754 3= 1.720 AVE 2743 SD=42.76
30.0 2802,2766,2804 3=.950 AVE 2791 SD=17.5
30.5 2825,2833,2817 3=.905 AVE 2825 SD=8
30.7 2833,2838,2863 3=1.340 AVE 2845 SD=13.12
31.0 2913,2894,2885 3=1.685 AVE 2897 SD=11.67
31.2 2918
31.4 2911
Hornday Black 2.200“
2.200 2616,2639,2659.2617,2640 5=1.295 AVE 2639 SD=15.33
2.250 2659,2658,2664,2667,2655 5=1.490 (3=.550) AVE 2660 SD=4.32
108 ELD M, Lever, Rem 7 1/2, Horn/Convert, 2.250
27.5 2465
28.0 2535
28.5 2560
28.8 2610
29.0 2641
29.3 2657
29.5 2658
------------
*Hodgdon Max for Lever, 107 Sierra hpbt match = 28.2 2,669 51,800 PSI, 24 inch barrel
*Hornady Gas gun data Max Lever, 105 bthp match = 29.5 2,550 18 inch barrel
RE: Sierra 85hpbt and Lever - skyrep - 04-26-2021
Lemonaid,
excellent write up.
I just finished my development for the 6mm ARC on my Bolt Gun (Savage 10).
I am now starting load workup for the Monster 20" Gas Gun.
Did you do break-in and have you seen velocity increase as the number of rounds down the barrel increased. My Savage velocity did not settled down until I reached just over 100 rounds down the barrel.
RE: Sierra 85hpbt and Lever - Lemonaid - 04-26-2021
For break-in I shot 60 rounds of Factory ammo and examined the barrel with a bore scope. As there was a fair amount of copper I cleaned that out and called it broke in.
This was my first use of the Magnetospeed on my 6mm ARC so no idea about if it will increase in speed down the road.
Just getting started but things are looking pretty good.