The Firing Line Forums - View Single Post - Chrono Data

0302Grendel · May 18, 2012, 02:10 PM

All - Just shot some reloads on the range with a buddy's chrono. Purpose was to make sure I was not loading too hot and to see if there was any difference between primers. All loads are 123gr Lapua Scenar in Hornady brass with 29g of Win 748 (exception being the one string in PPU brass with Win LRP as annotated in spread sheet).

A little background on the shoot - went out before work, so time was a little compressed (hey - I work and have a wife, I shoot when I can!!). When we started shooting, it was about 50, zero wind and the range was in shade. as the AM prgressed, the temp went up about 15 degrees and the sun came out, still zero wind. Took about a minute between each shot, and probably 5 min between strings.

To get the baseline, I fired 5 rounds of AA loaded ammo in the first string, and 5 rounds in the last string. I did this because I knew I was going to be shooting a little quick and the temp was going to change. As you can see, there is a difference in the chrono results, as at least to my eyes, the rounds got faster.

I would like to match the AA loaded ammo, and I am thinking that if I go to 29.2g this should put me close. Any other thougths based on below info? Any additional insight from the pros out there?

Thanks!! (sorry this is hard to read. Can't figure out how to past an excell spread sheet in a post)

1st String 2nd 3rd 4th 5th 6th 7th
AA Loaded Fed GM205M CCI 450 Rem 7 1/2 CCI No 41 PPU Brass Win LRP AA Loaded
Shot 1 2523 error 2353 2372 2396 2427 2596
2 2539 error 2392 2437 2384 2438 2645
3 2527 2335 2365 2442 2441 2463 2651
4 2528 2351 2362 2424 2441 2455 2632
5 2558 2367 2369 2441 2432 2464 2649
6 2349 2407 2465 2442 2464
7 2343 2420 2463 2421 2474
8 2358 2510 2446 2418 2463
9 2353 2537 2420 2450 2483
10 2391 2452 2448 2420 2471
Average 2535 2355.875 2416.7 2435.8 2424.5 2460.2 2634.6

May 18, 2012, 02:10 PM	#1
0302Grendel Junior Member Join Date: January 24, 2012 Posts: 6	Chrono Data - Whatdoyathink? All - Just shot some reloads on the range with a buddy's chrono. Purpose was to make sure I was not loading too hot and to see if there was any difference between primers. All loads are 123gr Lapua Scenar in Hornady brass with 29g of Win 748 (exception being the one string in PPU brass with Win LRP as annotated in spread sheet). A little background on the shoot - went out before work, so time was a little compressed (hey - I work and have a wife, I shoot when I can!!). When we started shooting, it was about 50, zero wind and the range was in shade. as the AM prgressed, the temp went up about 15 degrees and the sun came out, still zero wind. Took about a minute between each shot, and probably 5 min between strings. To get the baseline, I fired 5 rounds of AA loaded ammo in the first string, and 5 rounds in the last string. I did this because I knew I was going to be shooting a little quick and the temp was going to change. As you can see, there is a difference in the chrono results, as at least to my eyes, the rounds got faster. I would like to match the AA loaded ammo, and I am thinking that if I go to 29.2g this should put me close. Any other thougths based on below info? Any additional insight from the pros out there? Thanks!! (sorry this is hard to read. Can't figure out how to past an excell spread sheet in a post) 1st String 2nd 3rd 4th 5th 6th 7th AA Loaded Fed GM205M CCI 450 Rem 7 1/2 CCI No 41 PPU Brass Win LRP AA Loaded Shot 1 2523 error 2353 2372 2396 2427 2596 2 2539 error 2392 2437 2384 2438 2645 3 2527 2335 2365 2442 2441 2463 2651 4 2528 2351 2362 2424 2441 2455 2632 5 2558 2367 2369 2441 2432 2464 2649 6 2349 2407 2465 2442 2464 7 2343 2420 2463 2421 2474 8 2358 2510 2446 2418 2463 9 2353 2537 2420 2450 2483 10 2391 2452 2448 2420 2471 Average 2535 2355.875 2416.7 2435.8 2424.5 2460.2 2634.6