7mm RM

Hi all,

I have an sako 75 finnlite in 7mmRM. I have done some load development and found it loves 60gr Rl19 with a 168gr Berger vld hunter. The only problem is that I don't know my velocities as I have dropped my chrony and broken it. I have had it in to get repaired but its not reading correctly and its back in there and I doubt they will fix it. I have a sambar hunt in Alpine country coming up next weekend where there is a fair chance that the shots will be out to the 500m mark. I was just wondering if anyone had a rough idea what speeds might be? I'm thinking around that 2750-2850fps

I know its a stupid thread but I appreciate anyone's help

Cheers Pat

Shoot it at 100m, shoot it at 300m, measure the drop, work it out from there

Yip range validate.

Shoot it at 500 then adjust yor speed to match cheers

Sent from my SM-G920I using Tapatalk

I recently had doubts about the speed my chrony said i was getting. I took some advice from a mate on here and shot at a couple of ranges, 345 and 485. 1st group on each i didnt dial at all and measured the drop in inches and then dialled what that drop converted to in moa at that range. Sweet as pie now. You cant argue with actual data, some chronies are out, some bc's are out.

Quote:

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Originally Posted by Gibo

shot at a couple of ranges, 345 and 485.

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1 Any particular reason you chose those ranges?
2 Will that give you enough to know what it will be a 550? 600? 100?
3 If the answer to (2) is yes, why does anyone ever bother with a chrony????????

Thanks for your feed back guys I appreciate it a lot cheers.
Ill be heading to the range at some stage this week and let you guys know how I went.

Quote:

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Originally Posted by WillB

1 Any particular reason you chose those ranges?
2 Will that give you enough to know what it will be a 550? 600? 100?
3 If the answer to (2) is yes, why does anyone ever bother with a chrony????????

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Just set up the target then went back some, those two ranges just had a good spot to get a good prone position. Went further out on the gongs after I confirmed my settings in shooter and all was rosie :)

👍🏻

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

At least a hundy shy on the 72 grain load. How much faith do you put in the chrony? If its accurate id validate at range

I wouldn't sweat 100 fps, as said above if it's accurate validate at range and get out using it

If you can find a 500 yd range check your 100yd zero and the add 20mils,9 moa and you will be close at 500 or use 15mil, 5 moa @ 400, or 9, 4 moa@ 300. If you have some decend size target backing that should put you on paper and get you or the way

Cheers guys. I have a farm I could do that on but I don't get down there all the time. I'll head to the range again to test after the break is installed as I would rather shoot .5 groups and be 100fps slower.

Quote:

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Originally Posted by Timmay

Cheers guys. I have a farm I could do that on but I don't get down there all the time. I'll head to the range again to test after the break is installed as I would rather shoot .5 groups and be 100fps slower.

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I guess what I was saying is you may not be slower at all (just the chrony talking), until you get to test at range and calibrate you wont know :) Should be close enough to get on the target at 3-400 though. My chrony is plus or minus 100 :O_O:

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.

Quote:

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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

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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.

Quote:

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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

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