red_squirrel Posted September 16, 2018 Report Share Posted September 16, 2018 Hi, firstly sorry for the long post! I'm just starting out in rifle reloading, and need to choose a load for the comp at roundhouse nr bodmin next weekend. Yesterday I shot the test rounds over a magnetospeed chrono, I'd be very grateful for any help in choosing which one to load!! Rifle Specs: Howa 1500 24" with mod. Reloading: Rs62 powder, new starline large primer brass, bevelled, primer demurred and chamfered by hand. Run through a lyman m neck expander, primed (fiche large rifle), individually weighed powder drop and seated and crimped in lee dies on my dillon xl 650. oal 2.84. Here is the data we recorded: lap 139gr scenar 41.5, av velocity 2620, sd 42, .8moa 42 av velocity 2724, sd 43, 1.08 moa 42.5 av velocity 2760, sd 19, .85 moa 43 av velocity 2780, sd 22, 0.93 moa 43.5 av velocity 2835, sd 20, 1.02 moa Hornady 140gr eld 41.5, av velocity 2567, sd 13, .48moa 42 av velocity 2679, sd 9, .9 (0.4 with 1 flyer) moa 42.5 av velocity 2686, sd 19, .71 moa 43 av velocity 2726, sd 26, 0.93 moa 43.5 av velocity 2749, sd 24, 1.01 moa I had loaded 44 hrs but didn't fire them as I was getting quite a heavy bolt lift and some really defined ejector marks. I'm thinking the best in terms of sd and grouping were the 42.5 with the scenars, and the 42 with the hornady elds, but the velocity is not as high as I had expected. Will the velocity go up a bit with once fired brass? Would I be better going for the higher velocity, bearing in mind the shoot next weekend is at up to 1100yds? Any and all advise gratefully received :-) Link to comment Share on other sites More sharing options...
Steve steve Posted September 16, 2018 Report Share Posted September 16, 2018 Hi mate, i might be wrong but I would say your pressure will come down a little when using once fired brass over new fyi I’m shooting 140gr eldms with once fired Hornady brass, cci 250 primers , 44.3gr rs62 , ABSOLUTELY NO PRESSURE SINGS ever so slightly compressed load seated at 2.811 oal i will put them over a magnetospeed one day this week and update you but they shoot .25 MOA i have heard that rs62 varies a little batch to batch Link to comment Share on other sites More sharing options...
Steve steve Posted September 16, 2018 Report Share Posted September 16, 2018 I’m surprised there is a 86fps difference coming from the Lapua bullets but again I’ve heard they’re a fast bullet down the barrel Link to comment Share on other sites More sharing options...
markymark Posted September 16, 2018 Report Share Posted September 16, 2018 My recent ladder test with 139 Scenars and RS62 very closely mirror your results except a little higher velocity. I assume my 26” barrel is the reason. I just did a ladder test, I didn’t shoot groups with them. However from 40gr to 43.5gr the POI was all sub 1 MOA. I didn’t get a sticky bolt, however I was also seeing the ejector markings on the brass at 43gr. I going to re-run my test again at a different COAL. However im assuming my load will also be around 42.5gr. There or there abouts. My goal was to achieve 2750fps once I’ve got around that with a good node I’m not going to chase anymore velocity. Strelok suggest that this will achieve 1200yards supersonic. You say your shooting 1100yards, this load should see you well no? Link to comment Share on other sites More sharing options...
red_squirrel Posted September 16, 2018 Author Report Share Posted September 16, 2018 1 hour ago, markymark said: My recent ladder test with 139 Scenars and RS62 very closely mirror your results except a little higher velocity. I assume my 26” barrel is the reason. I just did a ladder test, I didn’t shoot groups with them. However from 40gr to 43.5gr the POI was all sub 1 MOA. I didn’t get a sticky bolt, however I was also seeing the ejector markings on the brass at 43gr. I going to re-run my test again at a different COAL. However im assuming my load will also be around 42.5gr. There or there abouts. My goal was to achieve 2750fps once I’ve got around that with a good node I’m not going to chase anymore velocity. Strelok suggest that this will achieve 1200yards supersonic. You say your shooting 1100yards, this load should see you well no? That makes a lot of sense, Hornady factory ammo goes at 2710 and my rifle seems to really like it. The velocity of the scenarios with 42.5 gr is about what I'm looking for, so I'll load another 150 of them, but the grouping and sd were disappointing. The lower weights with the hornadys shot better groups and sd. Will 2680fps see me supersonic at 1100? Link to comment Share on other sites More sharing options...
markymark Posted September 16, 2018 Report Share Posted September 16, 2018 Yes it should. Obviously data hasn’t been trued, but in theory it should take you to 1200yards. I think the load you’ve worked out so far should see you for your next shoot. I would be keen to re-test at perhaps 0.3 load up increments, look for a node around you chosen velocity then tweek seating depth to tighten up groups. How did you decide upon your COAL? Link to comment Share on other sites More sharing options...
red_squirrel Posted September 16, 2018 Author Report Share Posted September 16, 2018 Just went for max magazine length - and checked that there is no contact with the rifling. After the weekend I'll have time for some fine tuning. Link to comment Share on other sites More sharing options...
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