Thread: 7mm RM

Yep good point. I don't know how to test or calibrate a chrony anyway so testing the old fashion way sounds like a plan

I reckon you can't beat shooting a group at range say 350-500 onto a big target (so it catches your drop) without dialling after making sure zero is right. Then go from there.

I usually use the chrony as a starting point. It gives me a rough guide as to what to dial when I shoot some groups to validate drop at 3,4,500 yards etc. At which point I alter data to suit. Seems to work pretty well.

Originally Posted by Timmay

For a hijack the speeds I'm getting in my 7mmRemMag out of a Tikka 24.2"
Norma brass (first fire)
162 amax to fit the mag
CCI mag primer
And 2217 as per below loads


70 grains
2759
2756
2641

71
Error
2838
2804

72
2891
2884
2877

Do those speeds seem a bit low? The accuracy was 0.5" if I had not pulled 2 of the shots (break coming this week) worth changing primer or powders? Or should I not GAF about 100fps

Just what I shoot,
Tikka T3 lite, my hunting rifle, federal 215m primer, ADI2217 @69.5gn, 162gn Amax @ average 2840ft/s seated at 2.680" ogive(mag length). This load is my 1/2" or better if I do my part used only for hunting, could be faster but it is enough for me to shoot out to 500 meters.

Originally Posted by HartHunter2

..... I was just wondering if anyone had a rough idea what speeds might be? I'm thinking around that 2750-2850fps

A good estimate. QuickLOAD predicts very close to 2800ft/sec from the Finnlite's 620mm barrel.