Just measured my chamber on my 308. I got an Ogive reading on 2.254 on a 175gr SMK. What depth are you guys loading this round to when reloading? Are you keeping it on the lands, or giving it a jump?
- Thread starter Jackalope33B
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Re: 308 Ogive measurement
i dont use exact same bullet how ever when i found mine, i started with a .0020 jump to L&G and worked up to what my gun like. however i have read some ppl start at .0025 and work up. to eachs own. just be mindfull that if you to seat in or on the land to reduce your powder load due to no exspantion room causing over pressure than can get VERY dangerous FAST.
i dont use exact same bullet how ever when i found mine, i started with a .0020 jump to L&G and worked up to what my gun like. however i have read some ppl start at .0025 and work up. to eachs own. just be mindfull that if you to seat in or on the land to reduce your powder load due to no exspantion room causing over pressure than can get VERY dangerous FAST.
Re: 308 Ogive measurement
Did you mean .020 Jump, Not .0020..
Did you mean .020 Jump, Not .0020..
Re: 308 Ogive measurement
Hard to have a consistent 0.0020 jump when bullets can vary more that that at the oglive. Had to be 0.020
Hard to have a consistent 0.0020 jump when bullets can vary more that that at the oglive. Had to be 0.020
Re: 308 Ogive measurement
yes .020 sorry
yes .020 sorry
Re: 308 Ogive measurement
Well, i loaded up some 175 SMK's today using varget. I was shooting them .010 off the lands. Ogive length was 2.245 +/- .001.. Found my sweet spot between 44-44.5 grs. I had a (2) 10 shot groups that wouldnt cover a 3/4" dot. Im guessing I was shooting 1/2 moa. I will measure and post pics tomorrow.
Well, i loaded up some 175 SMK's today using varget. I was shooting them .010 off the lands. Ogive length was 2.245 +/- .001.. Found my sweet spot between 44-44.5 grs. I had a (2) 10 shot groups that wouldnt cover a 3/4" dot. Im guessing I was shooting 1/2 moa. I will measure and post pics tomorrow.
Re: 308 Ogive measurement
i had damn near same exact load this past week minus seatting depth. i was trying a "compressed" load at 2.830 OAL(but ogive OAL was hella short) but will trying a few new things. you can check out my load on the last post in the depot in this sub forum for .308
i had damn near same exact load this past week minus seatting depth. i was trying a "compressed" load at 2.830 OAL(but ogive OAL was hella short) but will trying a few new things. you can check out my load on the last post in the depot in this sub forum for .308
Re: 308 Ogive measurement
On my TRG-22 I get an ogive of 2.286 with 175 SMK and 2.220 with 155 Scenar and 2.270 with Berger 175 OTM Tactical. In each case .02 from the lands. Curious as to what others get in the TRG. Max COAL is 2.899 with the SMKs. When I measured chamber length with the Sinclair gauge I got 2.898. So there's a bit of a discrepancy. Ogive length was measured using the Hornady comparator gauge. Have had no pressure signs with any of my reloads, which generally use middle to higher end powder amounts but nothing exceed the high end of published ranges.
On my TRG-22 I get an ogive of 2.286 with 175 SMK and 2.220 with 155 Scenar and 2.270 with Berger 175 OTM Tactical. In each case .02 from the lands. Curious as to what others get in the TRG. Max COAL is 2.899 with the SMKs. When I measured chamber length with the Sinclair gauge I got 2.898. So there's a bit of a discrepancy. Ogive length was measured using the Hornady comparator gauge. Have had no pressure signs with any of my reloads, which generally use middle to higher end powder amounts but nothing exceed the high end of published ranges.
Re: 308 Ogive measurement
On my Savage 10PC, after measuring the chamber, my loads are set with a ogive of 2.223 with 175 SMK for a jump of 0.020". This is giving me a COAL of 2.787 to 2.794". Im reloading with 40.8 gr of IMR8208XBR which is giving me an average velocity of 2606 fps.
On my Savage 10PC, after measuring the chamber, my loads are set with a ogive of 2.223 with 175 SMK for a jump of 0.020". This is giving me a COAL of 2.787 to 2.794". Im reloading with 40.8 gr of IMR8208XBR which is giving me an average velocity of 2606 fps.
